Date Added: Jan 2013
Cryptography means that the authors keep a message secret during transmission through untrusted and insecure channel. It's simple means-encoding and decoding messages and has existed as long as people have distrusted each other and sought forms of secure communication. This encoding and decoding is perform by the some special key which is Secret key. The main concept of cryptography is to transmit information at the perfect node or actual receiving node. Originally the security of a cryptosystem or a cipher depended on the secrecy of the entire encrypting and decrypting procedures. In Cryptography cipher means that the encoded message or it is also called the encrypted message.