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In this paper, we propose a practical and secure authentication and key agreement (AKA) scheme for Universal Mobile Telecommunications System (UMTS). The paper introduces a new requirement, 'home network should be partially trusted in an authentication scheme' to the UMTS. The scheme integrates symmetric and public key cryptosystem. Issues such as kinds of 'subscriber identity/location confidential' and 'non-repudiation services' are solved in the scheme. The paper provides computational analysis, messages transmission length analysis to the proposed scheme. Furthermore, comparisons with other schemes are also given. The results demonstrate that the proposed scheme is practical and secure. Copyright (C) 2010 John Wiley & Sons, Ltd

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Mobile communication is definitely one of the major high-technology applications that offer present-day people a modern life of appropriate convenience In recent years, the third-generation cell phone system has approached maturity The Universal Mobile Telecommunication System (UMTS) IS currently the most widely Used System around the world The Third Generation Partnership Project is equipped with the Authentication and Key Agreement (AKA) protocol to maintain secrecy and security both during the authentication process and during the communication session through UMTS However, Hung and Li have pointed out that the UMTS-AKA protocol has three problems, involving bandwidth consumption, space overhead and synchronization of the sequence number which are yet to be resolved In addition, they have proposed an extension of the UMTS-AKA protocol, named the X-AKA protocol, to overcome these obstacles Nevertheless, the X-AKA protocol too appears to have problems of its own In this article, the weaknesses of X-AKA are enumerated In addition, a more practical AKA protocol for UNITS is presented The new protocol, based oil the same framework as its predecessor, proves to be more efficient and practical, satisfying the requirements of modern living Copyright (C) 2008 John Wiley & Sons, Lt