Integral Cryptanalysis: A New Key Determination Technique for 3-phase Kuznyechik Encryption

Abstract The primary objective of this work is to develop an algorithm for detecting the secret round key used in encryption by analyzing a collection plaintexts and ciphertexts encrypted with three-round Kuznyechik algorithm. In addition, fundamentals using integral cryptanalysis method Substitution-permutation (SP) network-based have been investigated. It has found that useful creating balanced set before third unbalanced at end round, which first byte active, remaining bytes are passive. Based on findings above, efficient determine final 3-round proposed utilizing cryptanalysis. According simulation results, approach offers approximately 90% improvement compared baseline algorithms terms time complexity, data, memory overhead.