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In this paper, the authors propose a scheme of encryption for Block ciphers in N-alphabet, where every member of any m-block of plain text is enciphered by different permutations which are generated by the help of a secret key word. Further the authors extend this method to multicode encryption using the fact that encrypting each member differently is the basis of multicode encryption. The philosophy of modern cryptanalysis is based on Kerchoff's principle stated as 'The security of cryptosystem must not depend on keeping the crypto-algorithm secret rather it should depend only on keeping the key secret'. In this principle, the sender communicates the secret key or keys to the intended recipient over a secured channel before the message being interchanged.
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