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          Security Enhancement to a User Authentication Scheme for Multi-Server Environment
          ZENG Peng * #
          Shanghai Key Laboratory of Trustworthy Computing, East China Normal University, Shanghai 200062
          *Correspondence author
          #Submitted by
          Funding: Research Fund for the Doctoral Program of Higher Education of China (No.20110076120016)
          Opened online: 4 November 2014
          Accepted by: none
          Citation: ZENG Peng.Security Enhancement to a User Authentication Scheme for Multi-Server Environment[OL]. [ 4 November 2014] http://www.o487.com/en_releasepaper/content/4615680
          User authentication schemes for multi-server setting allow a remote user to obtain services from multiple servers without the need to separately register with every individual server.In general, user authentication schemes for a multi-server environment should provide the following properties: single registration,low computation, no need for verification table, mutual authentication and key agreement, and security.Recently Wang, Juang, and Lei proposed a privacy-preservation user authentication scheme based on the quadratic residue and claimed the scheme meets all five requirements.In this paper, we demonstrate that their scheme is, unfortunately, vulnerable to a previously unpublished parallel-session attack.In other words, this attack enables a malicious user to impersonate legitimate users and obtain services from participating application servers without the victims' knowledge.We then show how the flaw in Wang emph{et al.}'s scheme can be fixed.
          Keywords:information security;multi-server; mutual authentication; password; smart card; privacy

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