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
