cryptography


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cryptography
n. writing or deciphering of secret codes


Wikipedia English - The Free EncyclopediaDownload this dictionary
Cryptography
Cryptography (or cryptology; derived from Greek κρυπτός kryptós "hidden," and the verb γράφω gráfo "write" or λεγειν legein "to speak") is the practice and study of hiding information. In modern times, cryptography is considered to be a branch of both mathematics and computer science, and is affiliated closely with information theorycomputer security, and engineering. Cryptography is used in applications present in technologically advanced societies; examples include the security of ATM cardscomputer passwords, and electronic commerce, which all depend on cryptography.
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Webster's Revised Unabridged Dictionary (1913)Download this dictionary
Cryptography
(n.)
The act or art of writing in secret characters; also, secret characters, or cipher.
  

Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
Telecommunication Standard TermsDownload this dictionary
cryptography
1. [The] principles, means, and methods for rendering plain information unintelligible and for restoring encrypted information to intelligible form. [NIS] 2. The branch of cryptology that treats of the principles, means, and methods of designing and using cryptosystems.

FOLDOCDownload this dictionary
cryptography
 
<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 cryptologypublic-key encryptionRSA.
Usenet newsgroups: news:sci.cryptnews:sci.crypt.research.
FAQ MIT.
Cryptography glossary.
RSA cryptography glossary.
Cryptography, PGP, and Your Privacy.
(2000-01-16)


(c) Copyright 1993 by Denis Howe

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