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Original Translated
Introduction to Cryptography Introduction à la cryptographie
Cryptography Cryptographie
Applications of cryptography include electronic commerce, chip-based payment cards, digital currencies, computer passwords, and military communications. Les applications de la cryptographie incluent le commerce électronique, les cartes de paiement à puce, les monnaies numériques, les mots de passe informatiques, et les communications militaires.
The growth of cryptographic technology has raised a number of legal issues in the information age. Cryptography’s potential for use as a tool for espionage and sedition has led many governments to classify it as a weapon and to limit or even prohibit its use and export.[6] In some jurisdictions where the use of cryptography is legal, laws permit investigators to compel the disclosure of encryption keys for documents relevant to an investigation.[7][8] Cryptography also plays a major role in digital rights management and copyright infringement of digital media.[9] La croissance de la technologie cryptographique a soulevé un certain nombre de questions juridiques à l'ère de l'information. le potentiel de la cryptographie en tant qu'outil d'espionnage et de sédition a conduit de nombreux gouvernements à la classer comme une arme et à en limiter ou même en interdire l'utilisation et l'exportation.[6] dans certaines juridictions où l'utilisation de la cryptographie est légale, les lois permettent aux enquêteurs de contraindre à la divulgation des clés de chiffrement pour les documents pertinents à une enquête.[7][8] la cryptographie joue également un rôle majeur dans la gestion des droits numériques et la violation des droits d'auteur des médias numériques.[9]
Terminology Terminologie
The first use of the term cryptograph (as opposed to cryptogram) dates back to the 19th century—originating from The Gold-Bug, a novel by Edgar Allan Poe. la première utilisation du terme cryptographe (par opposition à cryptogramme) remonte au 19ème siècle—provenant de le Scarabée d'or, un roman de Edgar Allan Poe.
Until modern times, cryptography referred almost exclusively to encryption, which is the process of converting ordinary information (called plaintext) into unintelligible form (called ciphertext). Jusqu'aux temps modernes, la cryptographie se référait presque exclusivement au chiffrement, qui est le processus de conversion d'informations ordinaires (appelées texte en clair) en une forme inintelligible (appelée texte chiffré).
Decryption is the reverse, in other words, moving from the unintelligible ciphertext back to plaintext. A cipher (or cypher) is a pair of algorithms that create the encryption and the reversing decryption. The detailed operation of a cipher is controlled both by the algorithm and in each instance by a “key“. The key is a secret (ideally known only to the communicants), usually a short string of characters, which is needed to decrypt the ciphertext. Formally, a “cryptosystem” is the ordered list of elements of finite possible plaintexts, finite possible cyphertexts, finite possible keys, and the encryption and decryption algorithms which correspond to each key. Keys are important both formally and in actual practice, as ciphers without variable keys can be trivially broken with only the knowledge of the cipher used and are therefore useless (or even counter-productive) for most purposes. Le déchiffrement est l'inverse, en d'autres termes, passer du texte chiffré inintelligible au texte en clair. un chiffre (ou cypher) est une paire d'algorithmes qui créent le chiffrement et le déchiffrement inverse. le fonctionnement détaillé d'un chiffre est contrôlé à la fois par l'algorithme et dans chaque instance par une « clef ». la clef est un secret (idéalement connu seulement des communicants), généralement une courte chaîne de caractères, qui est nécessaire pour déchiffrer le texte chiffré. formellement, un « cryptosystème » est la liste ordonnée des éléments des textes en clair possibles finis, des textes chiffrés possibles finis, des clefs possibles finies, et des algorithmes de chiffrement et de déchiffrement qui correspondent à chaque clef. les clefs sont importantes à la fois formellement et en pratique, car les chiffres sans clefs variables peuvent être trivialement cassés avec seulement la connaissance du chiffre utilisé et sont donc inutiles (ou même contre-productifs) pour la plupart des usages.
Cryptanalysis is the term used for the study of methods for obtaining the meaning of encrypted information without access to the key normally required to do so; i.e., it is the study of how to crack encryption algorithms or their implementations. Cryptanalyse est le terme utilisé pour l'étude des méthodes permettant d'obtenir la signification des informations cryptées sans accès à la clé normalement requise pour le faire ; c'est-à-dire, c'est l'étude de la manière de casser les algorithmes de cryptage ou leurs implémentations.
RFC 2828 advises that steganography is sometimes included in cryptology. RFC 2828 conseille que la stéganographie est parfois incluse dans la cryptologie.
The study of characteristics of languages that have some application in cryptography or cryptology (e.g. frequency data, letter combinations, universal patterns, etc.) is called cryptolinguistics. L'étude des caractéristiques des langues ayant une application en cryptographie ou cryptologie (par exemple, les données de fréquence, les combinaisons de lettres, les motifs universels, etc.) est appelée cryptolinguistique.
History of Cryptography Histoire de la cryptographie
Computer era Ère informatique
Just as the development of digital computers and electronics helped in cryptanalysis, it made possible much more complex ciphers. Furthermore, computers allowed for the encryption of any kind of data representable in any binary format, unlike classical ciphers which only encrypted written language texts; this was new and significant. Computer use has thus supplanted linguistic cryptography, both for cipher design and cryptanalysis. Many computer ciphers can be characterized by their operation on binary bit sequences (sometimes in groups or blocks), unlike classical and mechanical schemes, which generally manipulate traditional characters (i.e., letters and digits) directly. However, computers have also assisted cryptanalysis, which has compensated to some extent for increased cipher complexity. Nonetheless, good modern ciphers have stayed ahead of cryptanalysis; it is typically the case that use of a quality cipher is very efficient (i.e., fast and requiring few resources, such as memory or CPU capability), while breaking it requires an effort many orders of magnitude larger, and vastly larger than that required for any classical cipher, making cryptanalysis so inefficient and impractical as to be effectively impossible. Tout comme le développement des ordinateurs numériques et de l'électronique a aidé à la cryptanalyse, il a rendu possibles des chiffres beaucoup plus complexes. De plus, les ordinateurs ont permis le cryptage de tout type de données représentables dans n'importe quel format binaire, contrairement aux chiffres classiques qui ne cryptaient que les textes en langue écrite ; c'était nouveau et significatif. L'utilisation des ordinateurs a ainsi supplanté la cryptographie linguistique, tant pour la conception de chiffres que pour la cryptanalyse. De nombreux chiffres informatiques peuvent être caractérisés par leur fonctionnement sur des séquences binaires de bits (parfois en groupes ou en blocs), contrairement aux schémas classiques et mécaniques, qui manipulent généralement directement les caractères traditionnels (c'est-à-dire les lettres et les chiffres). Cependant, les ordinateurs ont également aidé la cryptanalyse, ce qui a compensé dans une certaine mesure l'augmentation de la complexité des chiffres. Néanmoins, les bons chiffres modernes ont gardé une longueur d'avance sur la cryptanalyse ; il est généralement le cas que l'utilisation d'un chiffre de qualité est très efficace (c'est-à-dire rapide et nécessitant peu de ressources, telles que la mémoire ou la CPU capacité), tandis que le casser nécessite un effort de plusieurs ordres de grandeur plus grand, et bien plus grand que celui requis pour tout chiffre classique, rendant la cryptanalyse si inefficace et impraticable qu'elle en devient pratiquement impossible.
Advent of modern cryptography Avènement de la cryptographie moderne
Extensive open academic research into cryptography is relatively recent; it began only in the mid-1970’s. In recent times, IBM personnel designed the algorithm that became the Federal (i.e., US) Data Encryption Standard; Whitfield Diffie and Martin Hellman published their key agreement algorithm; Des recherches académiques ouvertes et étendues sur la cryptographie sont relativement récentes ; elles n'ont commencé qu'au milieu des années 1970. Ces derniers temps, le personnel de IBM a conçu l'algorithme qui est devenu la norme fédérale (c'est-à-dire US) de cryptage des données ; Whitfield Diffie et Martin Hellman ont publié leur algorithme d'accord de clé;
As well as being aware of cryptographic history, cryptographic algorithm and system designers must also sensibly consider probable future developments while working on their designs. For instance, continuous improvements in computer processing power have increased the scope of brute-force attacks, so when specifying key lengths, the required key lengths are similarly advancing. En plus d'être conscients de l'histoire de la cryptographie, les concepteurs d'algorithmes et de systèmes cryptographiques doivent également considérer de manière sensée les développements futurs probables lors de la conception de leurs systèmes. Par exemple, les améliorations continues de la puissance de traitement des ordinateurs ont augmenté la portée des attaques par force brute, donc lors de la spécification des longueurs de clé, les longueurs de clé requises avancent de manière similaire.
The potential effects of quantum computing are already being considered by some cryptographic system designers developing post-quantum cryptography; the announced imminence of small implementations of these machines may be making the need for preemptive caution rather more than merely speculative.[4] Les effets potentiels de l'informatique quantique sont déjà pris en compte par certains concepteurs de systèmes cryptographiques développant la cryptographie post-quantique ; l'annonce de l'imminence de petites implémentations de ces machines peut rendre la nécessité de précautions préventives plus que simplement spéculative.[4]
Symmetric-key cryptography Cryptographie à clé symétrique
Main article: Symmetric-key algorithm Article principal : algorithme à clé symétrique
diagram showing encrypt with a key and decrypt process diagramme montrant le processus de chiffrement avec une clé et de déchiffrement
Symmetric-key cryptography, where a single key is used for encryption and decryption Cryptographie à clé symétrique, où une seule clé est utilisée pour le chiffrement et le déchiffrement
Symmetric-key cryptography refers to encryption methods in which both the sender and receiver share the same key (or, less commonly, in which their keys are different, but related in an easily computable way). This was the only kind of encryption publicly known until June 1976. La cryptographie à clé symétrique fait référence aux méthodes de chiffrement dans lesquelles l'expéditeur et le destinataire partagent la même clé (ou, moins couramment, dans lesquelles leurs clés sont différentes mais liées de manière facilement calculable). C'était le seul type de chiffrement connu publiquement jusqu'en juin 1976.
logic diagram showing International Data Encryption Algorithm cypher process diagramme logique montrant le processus de chiffrement de l'algorithme de chiffrement des données internationales
One round (out of 8.5) of the IDEA cipher, used in most versions of PGP and OpenPGP compatible software for time-efficient encryption of messages Un tour (sur 8,5) du chiffre IDEA, utilisé dans la plupart des versions de PGP et des logiciels compatibles OpenPGP pour un chiffrement des messages efficace en termes de temps
The Data Encryption Standard (DES) and the Advanced Encryption Standard (AES) are block cipher designs that have been designated cryptography standards by the US government (though DES’s designation was finally withdrawn after the AES was adopted). Le Data Encryption Standard (DES) et le Advanced Encryption Standard (AES) sont des conceptions de chiffre par bloc qui ont été désignées normes de cryptographie par le gouvernement US (bien que la désignation de DES ait finalement été retirée après l'adoption de AES).
Despite its deprecation as an official standard, DES (especially its still-approved and much more secure triple-DES variant) remains quite popular; it is used across a wide range of applications, from ATM encryption Malgré sa dépréciation en tant que norme officielle, DES (en particulier sa variante triple-DES, toujours approuvée et beaucoup plus sécurisée) reste très populaire ; il est utilisé dans une large gamme d'applications, de l'ATM chiffrement
to e-mail privacy à la confidentialité des e-mails
and secure remote access. et à l'accès distant sécurisé.
Many other block ciphers have been designed and released, with considerable variation in quality. Many, even some designed by capable practitioners, have been thoroughly broken, such as FEAL.[4] de nombreux autres chiffres par bloc ont été conçus et publiés, avec des variations considérables en termes de qualité. Beaucoup, même certains conçus par des praticiens compétents, ont été complètement cassés, comme FEAL.[4]
Unlike block and stream ciphers that are invertible, cryptographic hash functions produce a hashed output that cannot be used to retrieve the original input data. Cryptographic hash functions are used to verify the authenticity of data retrieved from an untrusted source or to add a layer of security. Contrairement aux chiffrements par bloc et par flux qui sont réversibles, les fonctions de hachage cryptographiques produisent une sortie hachée qui ne peut pas être utilisée pour récupérer les données d'entrée originales. les fonctions de hachage cryptographiques sont utilisées pour vérifier l'authenticité des données récupérées à partir d'une source non fiable ou pour ajouter une couche de sécurité.
Message authentication codes (MACs) are much like cryptographic hash functions, except that a secret key can be used to authenticate the hash value upon receipt;[4] this additional complication blocks an attack scheme against bare digest algorithms, and so has been thought worth the effort. Les codes d'authentification de message (MAC) sont très similaires aux fonctions de hachage cryptographiques, sauf qu'une clé secrète peut être utilisée pour authentifier la valeur de hachage à la réception;[4] cette complication supplémentaire bloque un schéma d'attaque contre les algorithmes de digest, et a donc été jugée digne de l'effort.
Modern cryptography Cryptographie moderne
The modern field of cryptography can be divided into several areas of study. The chief ones are discussed here; see Topics in Cryptography for more. le domaine moderne de la cryptographie peut être divisé en plusieurs domaines d'étude. les principaux sont discutés ici; voir Sujets en cryptographie pour plus.
Public-key cryptography Cryptographie à clé publique
diagram of Public-key cryptography showing public key and private key schéma de cryptographie à clé publique montrant la clé publique et la clé privée
Public-key cryptography, where different keys are used for encryption and decryption. Cryptographie à clé publique, où des clés différentes sont utilisées pour le chiffrement et le déchiffrement.
Symmetric-key cryptosystems use the same key for encryption and decryption of a message, although a message or group of messages can have a different key than others. A significant disadvantage of symmetric ciphers is the key management necessary to use them securely. Each distinct pair of communicating parties must, ideally, share a different key, and perhaps for each ciphertext exchanged as well. The number of keys required increases as the square of the number of network members, which very quickly requires complex key management schemes to keep them all consistent and secret. Les cryptosystèmes à clé symétrique utilisent la même clé pour le chiffrement et le déchiffrement d'un message, bien qu'un message ou un groupe de messages puisse avoir une clé différente des autres. un inconvénient majeur des chiffrements symétriques est la gestion des clés nécessaire pour les utiliser en toute sécurité. chaque paire distincte de parties communicantes doit, idéalement, partager une clé différente, et peut-être pour chaque texte chiffré échangé également. le nombre de clés requis augmente comme le carré du nombre de membres du réseau, ce qui nécessite très rapidement des schémas de gestion des clés complexes pour les garder toutes cohérentes et secrètes.
headshots of Whitfield Diffie and Martin Hellman photos de Whitfield Diffie et Martin Hellman

Other sentences

Original Similar TM records
Cryptography or cryptology (from Ancient Greek: “hidden, secret”; and “to write”, or “study”, respectively[1]) is the practice and study of techniques for secure communication in the presence of third parties called adversaries. [2] More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages; [3] various aspects in information security such as data

Cryptography or cryptology (from Ancient Greek: “hidden, secret”; and “to write”, or “study”, respectively[1]) is the practice and study of techniques for secure communication in the presence of third parties called adversaries. [2] More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages; [3] various aspects in information security such as data

Cryptography prior to the modern age was effectively synonymous with encryption, the conversion of information from a readable state to apparent nonsense. The originator of an encrypted message shares the decoding technique only with intended recipients to preclude access from adversaries. The cryptography literature often uses the names Alice (“A”) for the sender, Bob (“B”) for the intended recipient, and Eve (“eavesdropper“) for the adversary.[5] Since the development of rotor cipher machines in World War I and the advent of computers in World War II, the methods used to carry out cryptology have become increasingly complex and its application more widespread.

confidentiality, data integrity, authentication, and non-repudiation[4] are central to modern cryptography. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, electrical engineering, communication science, and physics.

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confidentiality, data integrity, authentication, and non-repudiation[4] are central to modern cryptography. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, electrical engineering, communication science, and physics.

confidentiality, data integrity, authentication, and non-repudiation[4] are central to modern cryptography. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, electrical engineering, communication science, and physics.

Cryptography or cryptology (from Ancient Greek: “hidden, secret”; and “to write”, or “study”, respectively[1]) is the practice and study of techniques for secure communication in the presence of third parties called adversaries. [2] More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages; [3] various aspects in information security such as data

Cryptography prior to the modern age was effectively synonymous with encryption, the conversion of information from a readable state to apparent nonsense. The originator of an encrypted message shares the decoding technique only with intended recipients to preclude access from adversaries. The cryptography literature often uses the names Alice (“A”) for the sender, Bob (“B”) for the intended recipient, and Eve (“eavesdropper“) for the adversary.[5] Since the development of rotor cipher machines in World War I and the advent of computers in World War II, the methods used to carry out cryptology have become increasingly complex and its application more widespread.

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Cryptography prior to the modern age was effectively synonymous with encryption, the conversion of information from a readable state to apparent nonsense. The originator of an encrypted message shares the decoding technique only with intended recipients to preclude access from adversaries. The cryptography literature often uses the names Alice (“A”) for the sender, Bob (“B”) for the intended recipient, and Eve (“eavesdropper“) for the adversary.[5] Since the development of rotor cipher machines in World War I and the advent of computers in World War II, the methods used to carry out cryptology have become increasingly complex and its application more widespread.

Cryptography prior to the modern age was effectively synonymous with encryption, the conversion of information from a readable state to apparent nonsense. The originator of an encrypted message shares the decoding technique only with intended recipients to preclude access from adversaries. The cryptography literature often uses the names Alice (“A”) for the sender, Bob (“B”) for the intended recipient, and Eve (“eavesdropper“) for the adversary.[5] Since the development of rotor cipher machines in World War I and the advent of computers in World War II, the methods used to carry out cryptology have become increasingly complex and its application more widespread.

Cryptography or cryptology (from Ancient Greek: “hidden, secret”; and “to write”, or “study”, respectively[1]) is the practice and study of techniques for secure communication in the presence of third parties called adversaries. [2] More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages; [3] various aspects in information security such as data

Prior to the early 20th century, cryptography was mainly concerned with linguistic and lexicographic patterns. Since then the emphasis has shifted, and cryptography now makes extensive use of mathematics, including aspects of information theory, computational complexity, statistics, combinatorics, abstract algebra, number theory, and finite mathematics generally. Cryptography is also a branch of engineering, but an unusual one since it deals with active, intelligent, and malevolent opposition (see cryptographic engineering and security engineering); other kinds of engineering (e.g., civil or chemical engineering) need deal only with neutral natural forces. There is also active research examining the relationship between cryptographic problems and quantum physics (see quantum cryptography and quantum computer).

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Modern cryptography is heavily based on mathematical theory and computer science practice; cryptographic algorithms are designed around computational hardness assumptions, making such algorithms hard to break in practice by any adversary. It is theoretically possible to break such a system, but it is infeasible to do so by any known practical means. These schemes are therefore termed computationally secure; theoretical advances, e.g., improvements in integer factorization algorithms, and faster computing technology require these solutions to be continually adapted. There exist information-theoretically secure schemes that provably cannot be broken even with unlimited computing power—an example is the one-time pad—but these schemes are more difficult to use in practice than the best theoretically breakable but computationally secure mechanisms.

Modern cryptography is heavily based on mathematical theory and computer science practice; cryptographic algorithms are designed around computational hardness assumptions, making such algorithms hard to break in practice by any adversary. It is theoretically possible to break such a system, but it is infeasible to do so by any known practical means. These schemes are therefore termed computationally secure; theoretical advances, e.g., improvements in integer factorization algorithms, and faster computing technology require these solutions to be continually adapted. There exist information-theoretically secure schemes that provably cannot be broken even with unlimited computing power—an example is the one-time pad—but these schemes are more difficult to use in practice than the best theoretically breakable but computationally secure mechanisms.

Decryption is the reverse, in other words, moving from the unintelligible ciphertext back to plaintext. A cipher (or cypher) is a pair of algorithms that create the encryption and the reversing decryption. The detailed operation of a cipher is controlled both by the algorithm and in each instance by a “key“. The key is a secret (ideally known only to the communicants), usually a short string of characters, which is needed to decrypt the ciphertext. Formally, a “cryptosystem” is the ordered list of elements of finite possible plaintexts, finite possible cyphertexts, finite possible keys, and the encryption and decryption algorithms which correspond to each key. Keys are important both formally and in actual practice, as ciphers without variable keys can be trivially broken with only the knowledge of the cipher used and are therefore useless (or even counter-productive) for most purposes.

Since then, cryptography has become a widely used tool in communications, computer networks, and computer security generally. Some modern cryptographic techniques can only keep their keys secret if certain mathematical problems are intractable, such as the integer factorization or the discrete logarithm problems, so there are deep connections with abstract mathematics. There are very few cryptosystems that are proven to be unconditionally secure. The one-time pad is one, and was proven to be so by Claude Shannon. There are a few important algorithms that have been proven secure under certain assumptions. For example, the infeasibility of factoring extremely large integers is the basis for believing that RSA is secure, and some other systems, but even so proof of unbreakability is unavailable since the underlying mathematical problem remains open. In practice, these are widely used, and are believed unbreakable in practice by most competent observers. There are systems similar to RSA, such as one by Michael O. Rabin that are provably secure provided factoring n = pq is impossible; it is quite unusable in practice. The discrete logarithm problem is the basis for believing some other cryptosystems are secure, and again, there are related, less practical systems that are provably secure relative to the solvability or insolvability discrete log problem.

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https://en.wikipedia.org/wiki/Cipher

https://en.wikipedia.org/wiki/Cipher

https://en.wikipedia.org/wiki/Ciphertext

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https://en.wikipedia.org/wiki/Adversary_(cryptography)

https://en.wikipedia.org/wiki/Cryptosystem

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https://en.wikipedia.org/wiki/RSA_(cryptosystem)

https://en.wikipedia.org/wiki/Cryptanalysis

Historically, ciphers were often used directly for encryption or decryption without additional procedures such as authentication or integrity checks. There are two kinds of cryptosystems: symmetric and asymmetric. In symmetric systems the same key (the secret key) is used to encrypt and decrypt a message. Data manipulation in symmetric systems is faster than asymmetric systems as they generally use shorter key lengths. Asymmetric systems use a public key to encrypt a message and a private key to decrypt it. Use of asymmetric systems enhances the security of communication.

Historically, ciphers were often used directly for encryption or decryption without additional procedures such as authentication or integrity checks. There are two kinds of cryptosystems: symmetric and asymmetric. In symmetric systems the same key (the secret key) is used to encrypt and decrypt a message. Data manipulation in symmetric systems is faster than asymmetric systems as they generally use shorter key lengths. Asymmetric systems use a public key to encrypt a message and a private key to decrypt it. Use of asymmetric systems enhances the security of communication.

Symmetric-key cryptosystems use the same key for encryption and decryption of a message, although a message or group of messages can have a different key than others. A significant disadvantage of symmetric ciphers is the key management necessary to use them securely. Each distinct pair of communicating parties must, ideally, share a different key, and perhaps for each ciphertext exchanged as well. The number of keys required increases as the square of the number of network members, which very quickly requires complex key management schemes to keep them all consistent and secret.

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Examples of asymmetric systems include RSA (Rivest-Shamir-Adleman), and ECC (Elliptic Curve Cryptography). Symmetric models include the commonly used AES (Advanced Encryption Standard) which replaced the older DES (Data Encryption Standard).

Examples of asymmetric systems include RSA (Rivest-Shamir-Adleman), and ECC (Elliptic Curve Cryptography). Symmetric models include the commonly used AES (Advanced Encryption Standard) which replaced the older DES (Data Encryption Standard).

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In colloquial use, the term “code” is often used to mean any method of encryption or concealment of meaning. However, in cryptography, code has a more specific meaning. It means the replacement of a unit of plaintext (i.e., a meaningful word or phrase) with a code word (for example, “wallaby” replaces “attack at dawn”).

In colloquial use, the term “code” is often used to mean any method of encryption or concealment of meaning. However, in cryptography, code has a more specific meaning. It means the replacement of a unit of plaintext (i.e., a meaningful word or phrase) with a code word (for example, “wallaby” replaces “attack at dawn”).

https://en.wikipedia.org/wiki/Colloquial

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https://en.wikipedia.org/wiki/Cryptanalysis

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https://en.wikipedia.org/wiki/Cryptosystem

https://en.wikipedia.org/wiki/Physics

Some use the terms cryptography and cryptology interchangeably in English, while others (including US military practice generally) use cryptography to refer specifically to the use and practice of cryptographic techniques and cryptology to refer to the combined study of cryptography and cryptanalysis. English is more flexible than several other languages in which cryptology (done by cryptologists) is always used in the second sense above.

Some use the terms cryptography and cryptology interchangeably in English, while others (including US military practice generally) use cryptography to refer specifically to the use and practice of cryptographic techniques and cryptology to refer to the combined study of cryptography and cryptanalysis. English is more flexible than several other languages in which cryptology (done by cryptologists) is always used in the second sense above.

The growth of cryptographic technology has raised a number of legal issues in the information age. Cryptography’s potential for use as a tool for espionage and sedition has led many governments to classify it as a weapon and to limit or even prohibit its use and export.[6] In some jurisdictions where the use of cryptography is legal, laws permit investigators to compel the disclosure of encryption keys for documents relevant to an investigation.[7][8] Cryptography also plays a major role in digital rights management and copyright infringement of digital media.[9]

Cryptography or cryptology (from Ancient Greek: “hidden, secret”; and “to write”, or “study”, respectively[1]) is the practice and study of techniques for secure communication in the presence of third parties called adversaries. [2] More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages; [3] various aspects in information security such as data

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Before the modern era, cryptography focused on message confidentiality (i.e., encryption)—conversion of messages from a comprehensible form into an incomprehensible one and back again at the other end, rendering it unreadable by interceptors or eavesdroppers without secret knowledge (namely the key needed for decryption of that message). Encryption attempted to ensure secrecy in communications, such as those of spies, military leaders, and diplomats. In recent decades, the field has expanded beyond confidentiality concerns to include techniques for message integrity checking, sender/receiver identity authentication, digital signatures, interactive proofs and secure computation, among others.

Cryptography prior to the modern age was effectively synonymous with encryption, the conversion of information from a readable state to apparent nonsense. The originator of an encrypted message shares the decoding technique only with intended recipients to preclude access from adversaries. The cryptography literature often uses the names Alice (“A”) for the sender, Bob (“B”) for the intended recipient, and Eve (“eavesdropper“) for the adversary.[5] Since the development of rotor cipher machines in World War I and the advent of computers in World War II, the methods used to carry out cryptology have become increasingly complex and its application more widespread.

Prior to the early 20th century, cryptography was mainly concerned with linguistic and lexicographic patterns. Since then the emphasis has shifted, and cryptography now makes extensive use of mathematics, including aspects of information theory, computational complexity, statistics, combinatorics, abstract algebra, number theory, and finite mathematics generally. Cryptography is also a branch of engineering, but an unusual one since it deals with active, intelligent, and malevolent opposition (see cryptographic engineering and security engineering); other kinds of engineering (e.g., civil or chemical engineering) need deal only with neutral natural forces. There is also active research examining the relationship between cryptographic problems and quantum physics (see quantum cryptography and quantum computer).

Cryptography or cryptology (from Ancient Greek: “hidden, secret”; and “to write”, or “study”, respectively[1]) is the practice and study of techniques for secure communication in the presence of third parties called adversaries. [2] More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages; [3] various aspects in information security such as data

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Prior to the early 20th century, cryptography was mainly concerned with linguistic and lexicographic patterns. Since then the emphasis has shifted, and cryptography now makes extensive use of mathematics, including aspects of information theory, computational complexity, statistics, combinatorics, abstract algebra, number theory, and finite mathematics generally. Cryptography is also a branch of engineering, but an unusual one since it deals with active, intelligent, and malevolent opposition (see cryptographic engineering and security engineering); other kinds of engineering (e.g., civil or chemical engineering) need deal only with neutral natural forces. There is also active research examining the relationship between cryptographic problems and quantum physics (see quantum cryptography and quantum computer).

Prior to the early 20th century, cryptography was mainly concerned with linguistic and lexicographic patterns. Since then the emphasis has shifted, and cryptography now makes extensive use of mathematics, including aspects of information theory, computational complexity, statistics, combinatorics, abstract algebra, number theory, and finite mathematics generally. Cryptography is also a branch of engineering, but an unusual one since it deals with active, intelligent, and malevolent opposition (see cryptographic engineering and security engineering); other kinds of engineering (e.g., civil or chemical engineering) need deal only with neutral natural forces. There is also active research examining the relationship between cryptographic problems and quantum physics (see quantum cryptography and quantum computer).

The growth of cryptographic technology has raised a number of legal issues in the information age. Cryptography’s potential for use as a tool for espionage and sedition has led many governments to classify it as a weapon and to limit or even prohibit its use and export.[6] In some jurisdictions where the use of cryptography is legal, laws permit investigators to compel the disclosure of encryption keys for documents relevant to an investigation.[7][8] Cryptography also plays a major role in digital rights management and copyright infringement of digital media.[9]

Cryptography prior to the modern age was effectively synonymous with encryption, the conversion of information from a readable state to apparent nonsense. The originator of an encrypted message shares the decoding technique only with intended recipients to preclude access from adversaries. The cryptography literature often uses the names Alice (“A”) for the sender, Bob (“B”) for the intended recipient, and Eve (“eavesdropper“) for the adversary.[5] Since the development of rotor cipher machines in World War I and the advent of computers in World War II, the methods used to carry out cryptology have become increasingly complex and its application more widespread.

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Cryptanalysis of the new mechanical devices proved to be both difficult and laborious. In the United Kingdom, cryptanalytic efforts at Bletchley Park during WWII spurred the development of more efficient means for carrying out repetitious tasks. This culminated in the development of the Colossus, the world’s first fully electronic, digital, programmable computer, which assisted in the decryption of ciphers generated by the German Army’s Lorenz SZ40/42 machine.

Cryptanalysis of the new mechanical devices proved to be both difficult and laborious. In the United Kingdom, cryptanalytic efforts at Bletchley Park during WWII spurred the development of more efficient means for carrying out repetitious tasks. This culminated in the development of the Colossus, the world’s first fully electronic, digital, programmable computer, which assisted in the decryption of ciphers generated by the German Army’s Lorenz SZ40/42 machine.

https://en.wikipedia.org/wiki/Cryptanalysis

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https://en.wikipedia.org/wiki/Physics

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and the RSA algorithm was published in Martin Gardner‘s Scientific American column. Following their work in 1976, it became popular to consider cryptography systems based on mathematical problems that are easy to state but have been found difficult to solve.

Extensive open academic research into cryptography is relatively recent; it began only in the mid-1970’s. In recent times, IBM personnel designed the algorithm that became the Federal (i.e., US) Data Encryption Standard; Whitfield Diffie and Martin Hellman published their key agreement algorithm;

Message authentication codes (MACs) are much like cryptographic hash functions, except that a secret key can be used to authenticate the hash value upon receipt;[4] this additional complication blocks an attack scheme against bare digest algorithms, and so has been thought worth the effort.

https://en.wikipedia.org/wiki/RSA_(algorithm)

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Since then, cryptography has become a widely used tool in communications, computer networks, and computer security generally. Some modern cryptographic techniques can only keep their keys secret if certain mathematical problems are intractable, such as the integer factorization or the discrete logarithm problems, so there are deep connections with abstract mathematics. There are very few cryptosystems that are proven to be unconditionally secure. The one-time pad is one, and was proven to be so by Claude Shannon. There are a few important algorithms that have been proven secure under certain assumptions. For example, the infeasibility of factoring extremely large integers is the basis for believing that RSA is secure, and some other systems, but even so proof of unbreakability is unavailable since the underlying mathematical problem remains open. In practice, these are widely used, and are believed unbreakable in practice by most competent observers. There are systems similar to RSA, such as one by Michael O. Rabin that are provably secure provided factoring n = pq is impossible; it is quite unusable in practice. The discrete logarithm problem is the basis for believing some other cryptosystems are secure, and again, there are related, less practical systems that are provably secure relative to the solvability or insolvability discrete log problem.

Since then, cryptography has become a widely used tool in communications, computer networks, and computer security generally. Some modern cryptographic techniques can only keep their keys secret if certain mathematical problems are intractable, such as the integer factorization or the discrete logarithm problems, so there are deep connections with abstract mathematics. There are very few cryptosystems that are proven to be unconditionally secure. The one-time pad is one, and was proven to be so by Claude Shannon. There are a few important algorithms that have been proven secure under certain assumptions. For example, the infeasibility of factoring extremely large integers is the basis for believing that RSA is secure, and some other systems, but even so proof of unbreakability is unavailable since the underlying mathematical problem remains open. In practice, these are widely used, and are believed unbreakable in practice by most competent observers. There are systems similar to RSA, such as one by Michael O. Rabin that are provably secure provided factoring n = pq is impossible; it is quite unusable in practice. The discrete logarithm problem is the basis for believing some other cryptosystems are secure, and again, there are related, less practical systems that are provably secure relative to the solvability or insolvability discrete log problem.

Modern cryptography is heavily based on mathematical theory and computer science practice; cryptographic algorithms are designed around computational hardness assumptions, making such algorithms hard to break in practice by any adversary. It is theoretically possible to break such a system, but it is infeasible to do so by any known practical means. These schemes are therefore termed computationally secure; theoretical advances, e.g., improvements in integer factorization algorithms, and faster computing technology require these solutions to be continually adapted. There exist information-theoretically secure schemes that provably cannot be broken even with unlimited computing power—an example is the one-time pad—but these schemes are more difficult to use in practice than the best theoretically breakable but computationally secure mechanisms.

Prior to the early 20th century, cryptography was mainly concerned with linguistic and lexicographic patterns. Since then the emphasis has shifted, and cryptography now makes extensive use of mathematics, including aspects of information theory, computational complexity, statistics, combinatorics, abstract algebra, number theory, and finite mathematics generally. Cryptography is also a branch of engineering, but an unusual one since it deals with active, intelligent, and malevolent opposition (see cryptographic engineering and security engineering); other kinds of engineering (e.g., civil or chemical engineering) need deal only with neutral natural forces. There is also active research examining the relationship between cryptographic problems and quantum physics (see quantum cryptography and quantum computer).

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https://en.wikipedia.org/wiki/Brute-force_attack

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https://en.wikipedia.org/wiki/Quantum_computing

https://en.wikipedia.org/wiki/Quantum_computing

https://en.wikipedia.org/wiki/Quantum_computer

https://en.wikipedia.org/wiki/Quantum_physics

https://en.wikipedia.org/wiki/Post-quantum_cryptography

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https://en.wikipedia.org/wiki/Data_Encryption_Standard

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https://en.wikipedia.org/wiki/Pretty_Good_Privacy

https://en.wikipedia.org/wiki/PHP

https://en.wikipedia.org/wiki/E-mail_privacy

Symmetric key ciphers are implemented as either block ciphers or stream ciphers. A block cipher enciphers input in blocks of plaintext as opposed to individual characters, the input form used by a stream cipher.

Symmetric key ciphers are implemented as either block ciphers or stream ciphers. A block cipher enciphers input in blocks of plaintext as opposed to individual characters, the input form used by a stream cipher.

https://en.wikipedia.org/wiki/Block_ciphers

https://en.wikipedia.org/wiki/Block_ciphers

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https://en.wikipedia.org/wiki/Blog

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https://en.wikipedia.org/wiki/Stream_ciphers

https://en.wikipedia.org/wiki/Category:Stream_ciphers

https://en.wikipedia.org/wiki/Block_ciphers

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https://en.wikipedia.org/wiki/Encryption

https://en.wikipedia.org/wiki/Advanced_Encryption_Standard

https://en.wikipedia.org/wiki/Advanced_Encryption_Standard

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https://en.wikipedia.org/wiki/Secure_Shell

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https://en.wikipedia.org/wiki/Secrecy

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Stream ciphers, in contrast to the ‘block’ type, create an arbitrarily long stream of key material, which is combined with the plaintext bit-by-bit or character-by-character, somewhat like the one-time pad. In a stream cipher, the output stream is created based on a hidden internal state that changes as the cipher operates. That internal state is initially set up using the secret key material. RC4 is a widely used stream cipher; see Category:Stream ciphers.[4] Block ciphers can be used as stream ciphers; see Block cipher modes of operation.

Stream ciphers, in contrast to the ‘block’ type, create an arbitrarily long stream of key material, which is combined with the plaintext bit-by-bit or character-by-character, somewhat like the one-time pad. In a stream cipher, the output stream is created based on a hidden internal state that changes as the cipher operates. That internal state is initially set up using the secret key material. RC4 is a widely used stream cipher; see Category:Stream ciphers.[4] Block ciphers can be used as stream ciphers; see Block cipher modes of operation.

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https://en.wikipedia.org/wiki/RC4

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https://en.wikipedia.org/wiki/Cipher

Cryptographic hash functions are a third type of cryptographic algorithm. They take a message of any length as input, and output a short, fixed length hash, which can be used in (for example) a digital signature. For good hash functions, an attacker cannot find two messages that produce the same hash. MD4 is a long-used hash function that is now broken; MD5, a strengthened variant of MD4, is also widely used but broken in practice. The US National Security Agency developed the Secure Hash Algorithm series of MD5-like hash functions: SHA-0 was a flawed algorithm that the agency withdrew; SHA-1 is widely deployed and more secure than MD5, but cryptanalysts have identified attacks against it; the SHA-2 family improves on SHA-1, but is vulnerable to clashes as of 2011; and the US standards authority thought it “prudent” from a security perspective to develop a new standard to “significantly improve the robustness of NIST‘s overall hash algorithm toolkit.”

Cryptographic hash functions are a third type of cryptographic algorithm. They take a message of any length as input, and output a short, fixed length hash, which can be used in (for example) a digital signature. For good hash functions, an attacker cannot find two messages that produce the same hash. MD4 is a long-used hash function that is now broken; MD5, a strengthened variant of MD4, is also widely used but broken in practice. The US National Security Agency developed the Secure Hash Algorithm series of MD5-like hash functions: SHA-0 was a flawed algorithm that the agency withdrew; SHA-1 is widely deployed and more secure than MD5, but cryptanalysts have identified attacks against it; the SHA-2 family improves on SHA-1, but is vulnerable to clashes as of 2011; and the US standards authority thought it “prudent” from a security perspective to develop a new standard to “significantly improve the robustness of NIST‘s overall hash algorithm toolkit.”

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Thus, a hash function design competition was meant to select a new U.S. national standard, to be called SHA-3, by 2012. The competition ended on October 2, 2012 when the NIST announced that Keccak would be the new SHA-3 hash algorithm.

Thus, a hash function design competition was meant to select a new U.S. national standard, to be called SHA-3, by 2012. The competition ended on October 2, 2012 when the NIST announced that Keccak would be the new SHA-3 hash algorithm.

https://en.wikipedia.org/wiki/NIST_hash_function_competition

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