Abstract
The secure transmission of any form of data over a communication medium is primary important across the globe or in research arena. Cryptography is a branch of cryptology and it provides security for data transmission between any communicating parties. The Hill cipher is one of the symmetric key substitution algorithms. Hill Cipher is vulnerable to known plaintext attack. This paper presents randomized cryptosystem based on linear transformation using variable length sub key groups. The proposed technique shares a prime circulant matrix as a secret key. The security analysis and performance of the method are studied and presented.
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