1. Cryptography-Theory and Practice;Stinson,2005
2. Applied Cryptography – Protocols, Algorithms and Source Code in C;Schneier,1996
3. Introduction to Modern Cryptography: Principles and Protocols;Katz,2007
4. Recommendation GSM 02.09, European Telecommunications Standards Institute (ETSI), Security Aspects, 1993.
5. 3G TS 33 401 V 9.3.1 (2010-04) 3rd Generation Partnership Project; Technical Group Services and System Aspects; 3 GPP System Architecture Evolution (SAE); Security architecture (Release 9).