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Qu'est-ce (qui) est cryptography - définition
cryptography
![French]] cipher machine, with arms of [[Henri II of France]]](https://commons.wikimedia.org/wiki/Special:FilePath/16th century French cypher machine in the shape of a book with arms of Henri II.jpg?width=200 "French]] cipher machine, with arms of [[Henri II of France]]")
![[[Poznań]] monument (''center'') to Polish cryptanalysts whose breaking of Germany's Enigma machine ciphers, beginning in 1932, altered the course of World War II](https://commons.wikimedia.org/wiki/Special:FilePath/2008-09 Kaiserschloss Kryptologen.JPG?width=200 "[[Poznań]] monument (''center'') to Polish cryptanalysts whose breaking of Germany's Enigma machine ciphers, beginning in 1932, altered the course of World War II")
![First page of a book by [[Al-Kindi]] which discusses encryption of messages](https://commons.wikimedia.org/wiki/Special:FilePath/Al-kindi cryptographic.png?width=200 "First page of a book by [[Al-Kindi]] which discusses encryption of messages")
![[[Whitfield Diffie]] and [[Martin Hellman]], authors of the first published paper on public-key cryptography.](https://commons.wikimedia.org/wiki/Special:FilePath/Diffie and Hellman.jpg?width=200 "[[Whitfield Diffie]] and [[Martin Hellman]], authors of the first published paper on public-key cryptography.")
![Enciphered letter from [[Gabriel de Luetz d'Aramon]], [[French Ambassador to the Ottoman Empire]], after 1546, with partial decipherment](https://commons.wikimedia.org/wiki/Special:FilePath/Encoded letter of Gabriel Luetz d Aramon after 1546 with partial deciphering.jpg?width=200 "Enciphered letter from [[Gabriel de Luetz d'Aramon]], [[French Ambassador to the Ottoman Empire]], after 1546, with partial decipherment")
![Cipher Bureau]], for 7 years before the war, and subsequent decryption at [[Bletchley Park]], was important to Allied victory.<ref name="kahnbook" />](https://commons.wikimedia.org/wiki/Special:FilePath/Enigma.jpg?width=200 "Cipher Bureau]], for 7 years before the war, and subsequent decryption at [[Bletchley Park]], was important to Allied victory.<ref name=\"kahnbook\" />")
![PGP]] and OpenPGP compatible software for time-efficient encryption of messages](https://commons.wikimedia.org/wiki/Special:FilePath/International Data Encryption Algorithm InfoBox Diagram.svg?width=200 "PGP]] and OpenPGP compatible software for time-efficient encryption of messages")
![Reconstructed [[ancient Greek]] ''[[scytale]]'', an early cipher device](https://commons.wikimedia.org/wiki/Special:FilePath/Skytala&EmptyStrip-Shaded.png?width=200 "Reconstructed [[ancient Greek]] ''[[scytale]]'', an early cipher device")
PRACTICE AND STUDY OF SECURE COMMUNICATION TECHNIQUES
CryptologY; CryptographY; Cryptology; Cryptographer; Cryptographic; Codes and ciphers; Cyptography; Computer Cryptology; Cryptography Classification; Cryptography Notes; Cryptographic systems; Declarative Security System; Cryptographic Systems; Secret code; Code making; Polygraphia; Applied cryptography; Kriptografia; Mathematical cryptography; Cryptographically; Lightweight cipher
<cryptography> The practise and study of encryption and
decryption - encoding data so that it can only be decoded by
specific individuals. A system for encrypting and decrypting
data is a cryptosystem. These usually involve an algorithm
for combining the original data ("plaintext") with one or
more "keys" - numbers or strings of characters known only to
the sender and/or recipient. The resulting output is known as
"ciphertext".
The security of a cryptosystem usually depends on the secrecy
of (some of) the keys rather than with the supposed secrecy of
the algorithm. A strong cryptosystem has a large range of
possible keys so that it is not possible to just try all
possible keys (a "brute force" approach). A strong
cryptosystem will produce ciphertext which appears random to
all standard statistical tests. A strong cryptosystem will
resist all known previous methods for breaking codes
("cryptanalysis").
See also cryptology, public-key encryption, RSA.
Usenet newsgroups: news:sci.crypt,
news:sci.crypt.research.
FAQ {cryptography-faq/">MIT
(ftp://rtfm.mit.edu/pub/usenet/news.answers/cryptography-faq/) }.
{Cryptography glossary
(http://io.com/cryptographyritter/GLOSSARY.HTM#BruteForceAttack) }.
{RSA cryptography glossary
(http://rsasecurity.com/rsalabs/faq/glossary.html) }.
{Cryptography, PGP, and Your Privacy
(http://draco.centerline.com:8080/cryptographyfranl/crypto.html) }.
(2000-01-16)
cryptography
PRACTICE AND STUDY OF SECURE COMMUNICATION TECHNIQUES
CryptologY; CryptographY; Cryptology; Cryptographer; Cryptographic; Codes and ciphers; Cyptography; Computer Cryptology; Cryptography Classification; Cryptography Notes; Cryptographic systems; Declarative Security System; Cryptographic Systems; Secret code; Code making; Polygraphia; Applied cryptography; Kriptografia; Mathematical cryptography; Cryptographically; Lightweight cipher
¦ noun the art of writing or solving codes.
Derivatives
cryptographer noun
cryptographic adjective
cryptographically adverb
Cryptography
PRACTICE AND STUDY OF SECURE COMMUNICATION TECHNIQUES
CryptologY; CryptographY; Cryptology; Cryptographer; Cryptographic; Codes and ciphers; Cyptography; Computer Cryptology; Cryptography Classification; Cryptography Notes; Cryptographic systems; Declarative Security System; Cryptographic Systems; Secret code; Code making; Polygraphia; Applied cryptography; Kriptografia; Mathematical cryptography; Cryptographically; Lightweight cipher
·noun The act or art of writing in secret characters; also, secret characters, or cipher.
Wikipédia
Cryptography
Cryptography, or cryptology (from |translit=kryptós}} "hidden, secret"; and graphein, "to write", or -logia, "study", respectively), is the practice and study of techniques for secure communication in the presence of adversarial behavior. More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages.
Exemples du corpus de texte pour cryptography
1. Addressing the event, Nguyen Chien, head of the Governmental Cryptography Committee, said the honour reflect the traditional friendship, special solidarity and comprehensive co–operation between the two Parties, governments, peoples, and the cryptography agencies of Vietnam and Laos.
2. The Vietnam Governmental Cryptography Committee has presented the friendship decoration to 14 Lao cryptographers on the occasion of the committee‘s 60th anniversary.
3. The same day, President Triet paid Tet visits to the Governmental Cryptography Committee, and the President Ho Chi Minh Mausoleum Protection High Command. (VNA)
4. He is an adviser to the IDF on cryptography, and has written two novels, worked as an actor and opened a restaurant with his wife.
5. Cheman calls his encryption method «Absolute Public Key Cryptography.» The above security essential is seriously lacking in the encryption techniques presently available in the market.