Optimized DES Algorithm Using X-Nor Operand Upto 4 Round on Spartan3

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Executive Summary

In this paper, linear cryptanalysis is a known-plaintext attack that uses a linear relation between input-bits, output-bits, and key-bits of an encryption algorithm that holds with a certain probability. If enough plaintext-ciphertext pairs are provided, this approximation can be used to assign probabilities to the possible keys and to locate the most probable one. Along with the society relies on more and more greatly to the computer, people also attach more and more importance to the security problem in the application. The cryptography is continuously safeguarding the safe effectively protective screen of system. Owing to the fact that to break the key using mathematics technology is very difficult, people put forward the side-channel attack method in recent years.

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