Analysis and Design of Affine and Hill Cipher

Cryptography is the study of mathematical techniques for all aspects of information security. Cryptanalysis is the complementary science concerned with the methods to defeat these techniques. Cryptology is the study of cryptography and cryptanalysis. The security of information encompasses the following aspects: • confidentiality or privacy, • data integrity, • authentication, • nonrepudiation. Each of these aspects of message security can addressed by standard methods in cryptography. Besides exchange of messages, tools from cryptography can be applied to sharing an access key between multiple parties so that no one person can gain access to a vault by any two of them can. Another role is in the design of electronic forms of cash. In this paper, we study affine and Hill cipher in cryptography.