global-journal-of-computer-science-and-technology Global Journal of Computer Science and Technology 0975-4350 0975-4172 Global Journals Publishing Group Incorporated 74081 Breaking of Simplified Data Encryption Standard using Genetic Algorithm SharmaDr. Lavkush sharmaram gopal INDIA, FET RBS COLLEGE ,AGRA 15 05 2012 12 5 55 59

Cryptanalysis of ciphertext by using evolutionary algorithm has gained so much interest in recent years. In this paper we have used a Genetic algorithm with improved crossover operator (Ring Crossover) for cryptanalysis of S-DES. There so many attacks in cryptography. The cipher text attack only is considered here 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 indicate that, this is a promising method and can be adopted to handle other complex block ciphers like DES, AES.

 Cryptanalysis Ciphertext attack Simplified Data Encryption Standard genetic algorithm Key search space Full Text

Cryptanalysis of ciphertext by using evolutionary algorithm has gained so much interest in recent years. In this paper we have used a Genetic algorithm with improved crossover operator (Ring Crossover) for cryptanalysis of SDES. There so many attacks in cryptography. The cipher text attack only is considered here 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 indicate that, this is a promising method and can be adopted to handle other complex block ciphers like DES, AES.