Design, Implementation, and Analysis of a Block Cipher Based on a Secure Chaotic Generator

This work proposes a new secure chaos-based encryption/decryption system, operating in cipher block chaining (CBC) mode, and analyze its performance. The cryptosystem includes robust pseudorandom number generator of chaotic sequences (PRNG-CS). A strong S-box is proposed to perform circular substitution operation (confusion process). PRNG-CS consists four discrete 1-D maps, weakly coupled by predefined coupling matrix M, avoid, on the one hand, divide-and-conquer attack and, other improve generated sequence’s randomness lengths. noun also used construction S-box. Moreover, 2-D modified cat map horizontal addition diffusion (HAD) preceded vertical (VAD) are introduced process. security analysis numerous simulation results main components (PRNG-CS S-box) as well whole reveal that holds up against various types statistical cryptographic attacks.