Volume 3 / Issue 2 - 2010

Modeling of secure instant messaging system in GSM

O. J. Anyaebu, Dike N. and *Oduali I.

Department of Electrical/Electronic Engineering, University of Port Harcourt, Nigeria

2010

ABSTRACT

With the rapid development in global communication networks, the threat of security and in particular that of Global System for Mobile Communication (GSM) is real and highly dangerous. Instant messaging has become so common on GSM for real time communication. This paper focuses on Modeling of Secure Instant Messaging System in GSM using Data Encryption Standard. A cipher text is obtained by the Initial Permutation (IP). If the times of the iteration are large enough, the randomness of the encryption and decryption function is so large that attackers can not break this cryptosystem. The packet data – conversation (audio), text, graphics, color, and video messages – delivered may be very important and confidential. This report discusses how to protect data from interception by authentication and encryption.