Improvement majority function in A 5 1 stream cipher algorithm

Abstract EN

Security is an important issue, especially in today’s technologically advanced society.

Global System for Mobile Communications (GSM) is a world-wide standard for digital wireless communication.

GSM uses A5/1 stream cipher in order to provide privacy on air communication.

This paper introduce new improvements to the A5/1 stream cipher in order overcome the weakness that appear in clocking mechanism that used in A5/1 stream cipher.

New S-box generation is proposed to increase the efficient for A5/1 majority function and improve randomness features.

The randomness results confirm that the output bit-stream generated by the proposed stream cipher has improved the randomness performance.