A new cryptosystem based on chaotic map and operations algebraic

Based oil the study of some existing chaotic encryption algorithms, a new block cipher is proposed. The proposed cipher encrypts 128-bit plaintext to 128-bit ciphertext blocks, using a 128-bit key K and the initial value x(0) and the control parameter mu of logistic map. It consists of all initial permutation and eight computationally identical rounds followed by an output transformation. Round r uses a 128-bit roundkey K-(r) to transform a 128-bit input C(r-1), which is fed to the next round. The output after round 8 enters the Output transformation to produce the final ciphertext. All roundkeys are derived from K and a 128-bit random 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. (c) 2007 Elsevier Ltd. All rights reserved.