A Review Paper on Cryptography and Plaintext Based Transposition Method

From last few years, the public is becoming dependent on computers and networks , so they are also interested in the security of these same computers and networks. Encryption algorithm provides the necessary protection against the data intruders’ attacks by converting information from its original form into an unreadable form. The majority of current web authentication is built on username/password. And the password replacement offers more security, but it is very much difficult to use and expensive to deploy. Security of data can be done by a technique called cryptography. In data and telecommunications, cryptography is necessary when communicating over any untrusted medium ,which includes just about any network , particularly the Internet. At present, the range of cryptography applications have been expanded a lot in the modern area after the development of communication means; cryptography is essentially required to ensure that data are protected against unauthorized access and to prevent the practice of spying. Cryptography is a developing technology, which is important for network security and computer security. Study on cryptography is still in its developing stages and a considerable research effort is still required for secured communication. This paper talks about the cryptographic algorithm and Transposition technique.