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Security Analysis of a Multi-factor Authenticated Key Exchange Protocol

  • Feng Hao
  • Dylan Clarke
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7341)

Abstract

This paper shows several security weaknesses of a Multi-Factor Authenticated Key Exchange (MK-AKE) protocol, proposed by Pointcheval and Zimmer at ACNS’08. The Pointcheval-Zimmer scheme was designed to combine three authentication factors in one system, including a password, a secure token (that stores a private key) and biometrics. In a formal model, Pointcheval and Zimmer formally proved that an attacker had to break all three factors to win. However, the formal model only considers the threat that an attacker may impersonate the client; it however does not discuss what will happen if the attacker impersonates the server. We fill the gap by analyzing the case of the server impersonation, which is a realistic threat in practice. We assume that an attacker has already compromised the password, and we then present two further attacks: in the first attack, an attacker is able to steal a fresh biometric sample from the victim without being noticed; in the second attack, he can discover the victim’s private key based on the Chinese Remainder theorem. Both attacks have been experimentally verified. In summary, an attacker actually only needs to compromise a single password factor in order to break the entire system. We also discuss the deficiencies in the Pointcheval-Zimmer formal model and countermeasures to our attacks.

Keywords

Smart Card Authentication Scheme Chinese Remainder Theorem Fuzzy Extractor Iris Code 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Feng Hao
    • 1
  • Dylan Clarke
    • 1
  1. 1.School of Computing ScienceNewcastle UniversityUK

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