A Study of Authentication Schemes with User Anonymity for Wireless Networks

• Main Authors: Shu-Chuan Chuang, 莊淑娟
• Other Authors: Yen-Cheng Chen
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/75052146951548293592

碩士 === 國立暨南國際大學 === 資訊管理學系 === 94 === The use of anonymous channel tickets was proposed for authentication in wireless environments to provide user anonymity and to probably reduce the overhead of re-authentications. In 2004, Zhu and Ma proposed an authentication scheme with user anonymity based on the use of a one-way hash function and smart cards. Recently, Yang et al. also proposed a secure and efficient authentication protocol for anonymous channels in wireless systems without employing asymmetric cryptosystems. In this thesis, we will show that Zhu-Ma’s scheme fails to preserve user anonymity. We also find that Yang et al.’s scheme is vulnerable to guessing attacks performed by malicious visited networks. Via the proposed guessing attack, the secret keys of users may be revealed to visited networks. We will further propose a new practical authentication scheme preserving the same merits of their scheme. The proposed scheme has additional merits including: no verification table in the home network, free of time synchronization between mobile stations and visited networks, and without obsolete anonymous tickets left in visited networks. The proposed scheme is developed based on a secure one-way hash function and simple operations. The soundness of the authentication protocol is proved by using VO logic.