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cryptography    
n. 密码使用法,密码

密码使用法,密码

cryptography
密码术

cryptography
密码学

cryptography
n 1: the science of analyzing and deciphering codes and ciphers
and cryptograms [synonym: {cryptanalysis}, {cryptanalytics},
{cryptography}, {cryptology}]
2: act of writing in code or cipher [synonym: {cryptography},
{coding}, {secret writing}, {steganography}]

Cryptography \Cryp*tog"ra*phy\ (-f?), n. [Cf. F. cryptographie.]
1. The act or art of writing in code or secret characters;
also, secret characters, codes or ciphers, or messages
written in a secret code.
[1913 Webster PJC]

2. The science which studies methods for encoding messages so
that they can be read only by a person who knows the
secret information required for decoding, called the key;
it includes {cryptanalysis}, the science of decoding
encrypted messages without possessing the proper key, and
has several other branches; see for example
{steganography}.
[PJC]

48 Moby Thesaurus words for "cryptography":
cipher, code, coded message, coup de plume, criticism,
cryptanalysis, cryptoanalysis, cryptoanalytics, cryptogram,
cryptograph, cryptographer, cryptology, diagnostics, engrossment,
epigraphy, exegetics, hermeneutics, ink spilling, inkslinging,
inscription, invisible ink, lettering, lexicography,
literary criticism, macrography, metoposcopy, micrography,
oneirology, paleography, pathognomy, pen, pen-and-ink,
pencil driving, physiognomics, physiognomy, scrivenery, scrivening,
secret language, secret writing, semeiology, semeiotics,
sympathetic ink, symptomatology, textual criticism, tropology,
typewriting, typing, writing

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} {MIT
(ftp://rtfm.mit.edu/pub/usenet/news.answers/cryptography-faq/)}.

{Cryptography glossary
(http://io.com/~ritter/GLOSSARY.HTM#BruteForceAttack)}.

{RSA cryptography glossary
(http://rsasecurity.com/rsalabs/faq/glossary.html)}.

{Cryptography, PGP, and Your Privacy
(http://draco.centerline.com:8080/~franl/crypto.html)}.

(2000-01-16)


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