International Journal of Advances in Engineering & Technology (IJAET)
The process of studying methods of encryption to obtain information from encrypted data without knowing the secret key is called cryptanalysis. It is usually a deep analysis and attacking of an encryption method to find the secret key. In this paper, the authors present an approach for the comparative study on Data Encryption Standard (DES) using differential cryptanalysis and linear cryptanalysis. In this paper, cipher text only attack is adopted and varieties of optimum keys are generated based on the cost function values.