May 4, 2012
Introduction
1.1 Background
Nowadays mobile phone communications (phone calls) are used mostly by everyone due to the GSM technology. In mobile phones there are several services a person can use to communicate other than making a phone call such as; SMS, MMS, contact registry and cameras. The most commonly used service after phone calls is the SMS that most of us find it easier even faster to share or to communicate with one another. An SMS (short message service) is a text messaging service component in mobile phones that is offered by operators. Several companies presently are using SMS as a business tool/strategy in running their business. High authorities such as government organizations also make use of SMS technology. However, SMS technology is venerable to intruders or attackers whom threats the security of sensitive data transmitted through. In this paper we will show SMS security threats and the proposed solution to overcome such threats, by encrypting SMS messages using Diffie-Hellman. Telecommunication companies, E-marketers and banks are using SMS to run their business like; offering wallpapers, songs, mobile banking, hotel packages, etc... When the user subscribes to such services and interacts with them it will benefits those companies. In addition to that, banks and government departments uses SMS to provide their services in a convenient way. On the other hand there is a serious issue in SMS security because of several attacks that took place in the transmission medium. It is a great technology to use but it lacks security when sending our personal or sensitive information. That is because in GSM network the transmission channel is not secured allows intruders to intercept and keep record of any message passing through. In addition, telecommunication companies do not provide security service. Besides, there is no mandatory requirement for SMS system implantation which means confidentiality and