Saturday, January 29, 2011


Security of information results from the need for Private transmission of messages. It is very essential that Security coverage should be provided to the computer systems, including to security  to communication channels
Cryptography means hidden writing. Cryptography is used to protect information to which illegal access is possible and where other protective measures are inefficient
The basic idea in cryptography is to take a message in ordinary language, called plain text. This is transformed in some way to produce cipher text. The cipher text can now be sent to the correspondent. He uses another transformation to recover the plain text from the cipher text. The plain text is encrypted or hidden by the first transformation to obtain the cipher text. The cipher text is decrypted by another transformation to obtain the plain text once again. After encryption, cipher text can be transmitted over a data link or stored in a file

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