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Improved user identity confidentiality for UMTS mobile networks
, Article ECUMN 2007: Fourth European Conference on Universal Multiservice Networks, Toulouse, 14 February 2007 through 16 February 2007 ; 2007 , Pages 401-409 ; 076952768X (ISBN); 9780769527680 (ISBN) ; Asadpour, M ; Jalili, R ; Sharif University of Technology
2007
Abstract
In UMTS mobile networks, there are some circumstances that the International Mobile Subscriber Identity (IMSI) of a user is conveyed in clear-text over the radio interface. Such situations violate the anonymity of users. In this paper, we introduce an Improved User Identity Confidentiality (IUIC) mechanism which attempts to avoid the drawback and makes users more anonymous. We give the role of IMSI to anonymous tickets in such a way that IMSI is never exposed on the radio interface or over any other link. Our IUIC mechanism, employs symmetric cryptography based on the existing network access security features of UMTS. Its implementation, security, and performance issues are also considered....
Security enhancement for a low computation cost user authentication scheme
, Article International Conference on Security and Cryptography, SECRYPT 2006, Setubal, 7 August 2006 through 10 August 2006 ; 2006 , Pages 5-8 ; 9728865635 (ISBN); 9789728865634 (ISBN) ; Asadpour, M ; Jalili, R ; Sharif University of Technology
2006
Abstract
In 2003, Wu and Chieu proposed a user friendly remote authentication scheme using smart cards. Later, Yang and Wang pointed out that Wu and Chieu's scheme is vulnerable to the password guessing and forgery attacks. Recently, Lee et al. proposed an improved authentication scheme and claimed that their scheme is secure against forgery attack. However, in this paper, we illustrate that Lee et al.'s scheme is still vulnerable to the forgery attack. We also propose an enhancement of the scheme to resist such that attack. © 2010