meaning of cryptography

1. The act or art of writing in secret characters; also, secret characters, or cipher.
2. 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 MIT ftp://rtfm. mit. edu/pub/usenet/news. answers/cryptography-faq/ Cryptography glossary http://www. io. com/~ritter/GLOSSARY. HTM#BruteForceAttack. RSA cryptography glossary http://www. rsasecurity. com/rsalabs/faq/glossary. html. Cryptography, PGP, and Your Privacy http://draco. centerline. com:8080/~franl/crypto. html.

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