With the rapid development in global communication networks, the threat of security and in particular that of cellular telecommunication system is real and highly dangerous. Mobile phone and other wireless device usage is increasing daily with ground breaking technological developments – in design, style, content and micro-chips performance. The contents of the multimedia packages – conversation (audio), text, graphics, colour, and video messages - delivered may be very important and confidential. Such confidentiality needs to be protected. Any interference and interceptions in the communication process would bring about reduced system usage and development benefits. This paper discusses the several aspects of security of GSM and takes into consideration the fact that World-wide GSM usage is very high. It will also look at how GSM protects the data from interception by authentication, encryption, and ciphering. Some likely flaws in these security methods will be explored and possible measures suggested to curb the security flaws
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