A Novel Polyalphabetic Substitution Based Cryptosystem(NPSBC)
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Abstract
Cryptography is the art and science of achieving security by converting sensitive information to un-interpretable form such that it
cannot be interpreted by anyone except the intended recipient. An innumerable set of cryptographic schemes persist in which each of it has its
own affirmative and feeble characteristics. Innumerable algorithms have been developed over the years to provide security of information but
each of them has some merits and demerits. No single algorithm is sufficient on its own for this purpose. As a result researchers are constantly
devoting themselves in the field of cryptography to eliminate the deficiency and find a better solution. In this paper an effort has been made to
develop a Polyalphabetic Substitution based Substitution Cipher. Our aim is to encipher Plain texts depending on some parameters, which are
continuously varied with every run-time so that the cipher text becomes different for similar entered texts every runtime.
Keywords: Cryptography, Encryption, Decryption, Polyalphabetic Substitution Cipher, Bit-ratio test, Frequency distribution test, Vulnerability
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