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i would like to know how security of the gsm network is centrally managed.good additona details which are relevant to the security of the gsm network would be helpful to me
what are the security requirements for the gsm mobile communication network?
April 13th, 2011 
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GSM security algorithms are used to provide authentication and radio link privacy to users on a GSM network.
GSM uses three different security algorithms called A3, A5, and A8. In practice, A3 and A8 are generally implemented together (known as A3/A8).
An A3/A8 algorithm is implemented in Subscriber Identity Module (SIM) cards and in GSM network Authentication Centres. It is used to authenticate the customer and generate a key for encrypting voice and data traffic, as defined in 3GPP TS 43.020 (03.20 before Rel-4). Development of A3 and A8 algorithms is considered a matter for individual GSM network operators, although example implementations are available.
An A5 encryption algorithm scrambles the user’s voice and data traffic between the handset and the base station to provide privacy. An A5 algorithm is implemented in both the handset and the base station subsystem (BSS).
The GSM Association, having cooperated in the development of the 3GPP Confidentiality and Integrity Algorithms UEA2 and UIA2 ("The UEA2 & UIA2 Algorithm"), has been granted distribution rights to the Algorithms that have been developed through the collaborative efforts of the 3GPP Organisational Partners.
The UEA2 and UIA2 Algorithm specifications are available below and may be used only for the development and operation of equipment conforming to the UEA2 & UIA2 Algorithm or standards based on it. Every Beneficiary intending to implement and/or use the UEA2 & UIA2 Algorithm must sign a Restricted Usage Undertaking with a Custodian and demonstrate that they satisfy the approval criteria specified in the Restricted Usage Undertaking. A fee of EUR4,000 is chargeable to non-members of the GSM Association wishing to implement and/or use the UEA2 and UIA2 Algorithm.
For an introduction to the issues involved in GSM security, read
http://www.gsm-security.net/gsm-security-faq.shtml.
For more in-depth information, read
http://www.gsm-security.net/gsm-security-papers.shtml