Computer Security – ESORICS 2013

Volume 8134 of the series Lecture Notes in Computer Science pp 381-399

ASICS: Authenticated Key Exchange Security Incorporating Certification Systems

  • Colin BoydAffiliated withQueensland University of Technology
  • , Cas CremersAffiliated withInstitute of Information Security, ETH Zurich
  • , Michèle FeltzAffiliated withInstitute of Information Security, ETH Zurich
  • , Kenneth G. PatersonAffiliated withRoyal Holloway, University of London
  • , Bertram PoetteringAffiliated withRoyal Holloway, University of London
  • , Douglas StebilaAffiliated withQueensland University of Technology

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Most security models for authenticated key exchange (AKE) do not explicitly model the associated certification system, which includes the certification authority (CA) and its behaviour. However, there are several well-known and realistic attacks on AKE protocols which exploit various forms of malicious key registration and which therefore lie outside the scope of these models. We provide the first systematic analysis of AKE security incorporating certification systems (ASICS). We define a family of security models that, in addition to allowing different sets of standard AKE adversary queries, also permit the adversary to register arbitrary bitstrings as keys. For this model family we prove generic results that enable the design and verification of protocols that achieve security even if some keys have been produced maliciously. Our approach is applicable to a wide range of models and protocols; as a concrete illustration of its power, we apply it to the CMQV protocol in the natural strengthening of the eCK model to the ASICS setting.


authenticated key exchange (AKE) unknown key share (UKS) attacks certification authority (CA) invalid public keys PKI