Abstract: Based on the study of some existing chaotic encryption algorithms, a new block cipher was proposed. The proposed cipher encrypts 128-bit plaintext to 128-bit ciphertext blocks. It consists of eight computationally identical rounds transformation. All roundkeys are derived from K and a 128-bit pseudorandom binary sequence generated from a chaotic map. Analysis shows that the proposed block cipher does not suffer from the flaws of pure chaotic cryptosystems and possesses high security.

Key words: Block cipher, Chaotic map, Modulo multiplication, Permutation