Secure Message System for Mobile Communication Using A5/1 Algorithm

Abstract

The messaging system has become the most popular for mobile communication in the world. This paper is intended to implement secure messaging system for mobile communication. To encrypt / decrypt the message between the Mobile Station (MS) and the Base Transceiver Station (BTS), this system applies A5/1 algorithm. This system can be divided into two parts, uplink communication (MS to BTS) and downlink communication (BTS to MS).In this paper, two personal computers are used for BTS and other two personal computers are used for MS instead of real Mobile Station (MS).This system generates keystream before encryption and decryption process .It produces a unique (different) keystream for every frame throughout the call. Therefore this system can support data confidentiality and provide computationally fast and efficient through the use of the symmetric encryption.