Breaking of Simplified Data Encryption Standard Using Evolutionary Algorithm

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Lavkush Sharma
Nidhi Sharma


Cryptanalysis of ciphertext, plaintext by using evolutionary algorithm has gained so much interest in recent years. In this paper we used a Genetic algorithm with improved crossover operator (Ring Crossover) for cryptanalysis of S-DES and then results are compared with Simple Genetic Algorithm. Here the cipher text attack is considered and several keys are generated in the different run of the genetic algorithm on the basis of their cost function value which depends upon frequency of the letters. The results on the S-DES indicates that, this is a promising method and can be adopted to handle other complex block ciphers like DES, AES


Keywords: Cryptanalysis, Ciphertext attack, Simplified Data Encryption Standard, Genetic algorithm, Key search space


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