CryptographY

CryptographY (from the GreeK kryptós and gráphein, "to write") is the study of the principles and techniques by which information can be concealed in ciphers and later revealed by legitimate users employing the encryption key (see /Keys), but in which it is either impossible or computationally infeasible for an unauthorized person to do so.

:CryptologY -- CryptanalysiS

:/Hashfunctions: MD5 -- SHA-1

:Public Key Cryptosystems (Assymetric Algorithms): RSA -- Diffie-Hellman

:Secret Key Cryptosystems (Symetric Algorithms): EnigmA -- OneTimePads -- DataEncryptionStandard (DES) -- RC4--Blowfish - IDEA

:Terminology: /Keys -- CipheR -- CodE

Further Reading:

• Schneier, Bruce - Aplied Cryptography
• Schneier, Bruce - Secrets and Lies ISBN 0471253111