Improvement for Block Cipher Based on S-Box Reorganization
Xian Zhen Ma, Wei Zhang, Fu Rong Wang · Applied Mechanics and Materials · 2014
S-box is the core of block ciphers. Its cryptographic properties impact on the security of block ciphers directly. From S-box inherent weaknesses, this paper adopt Fractal theory, and put forward a method based on non S-box transformation to change the S-box using sequence, that is, using the sub-key of each round to determine the S-box sequence by Fractal theory, then the effects different keys in each encryption come true. The method improved encryption algorithm, enhanced encryption strength and increased the algorithms security.