Chaotic Modelling of the Generalized Self-Shrinking Generator

In this paper, a method of obtaining cryptographic sequences based on discrete time chaotic dynamical systems is presented. The importance of the proposal is due to that such cryptographic sequences are also output sequences of a nonlinear keystream generator known as generalized self-shrinking generator, which is still considered secure for symmetric cryptography. It is remarkable that the linearity of the proposed chaotic model based on additive one-dimensional cellular automata might be used to launch a cryptanalysis against such nonlinear generators.