International Journal of Engineering and Technology

Polynumeric cipher uses numbers for encryption. S-DES is used for initial permutation for key generation mechanism. Its weakness is the key repetition. To overcome this weakness there are many research going on to modify the key generation. In this paper a key generator function is implemented which address the same. It generates a key with length depends on the message security level Length of the plain text is equal to length of the key. Sender and receiver generate key exchange mechanism for resulting common secret key. This common secret key is further processed for encrypting numbers using poly numeric table.