Abstract

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:
\begin{asparaitem}
  \item confidentiality or privacy,
  \item data integrity,
  \item authentication,
  \item nonrepudiation.
\end{asparaitem}
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.

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