Secure gamma generation for stream cipher based on fuzzy logic

Abstract

In this paper, we propose a new approach for secure bit stream gamma generation based on the concept of fuzzy logic and linear feedback shift registers (LFSRs), combined in pseudorandom number generator based on fuzzy logic (FPRNG). The original idea for ensuring security for gamma generation is based on the initial states (the seeds) of LFSRs used in the generator. In this paper, we suggested the updated version of FPRNG. We also improve gamma security by accompaniment seed some valuable secure information. We found that configurations of membership functions (MFs) in FPRNG can significantly affect the randomness of the output stream of the developed generator. We can increase the gamma security as well as stream cipher security by keeping these configurations in secret additionally to seeds.