Douglas Stebila

ASICS: Authenticated key exchange security incorporating certification systems

Messages for a generic DH-type ASICS protocol.

Abstract

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.

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

Reference

Colin Boyd, Cas Cremers, Michèle Feltz, Kenneth G. Paterson, Bertram Poettering, Douglas Stebila. ASICS: Authenticated key exchange security incorporating certification systems. In Jason Crampton, Sushil Jajodia, Keith Mayes, editors, Proc. 18th European Symposium on Research in Computer Security (ESORICS) 2013, LNCS, vol. 8134, pp. 381-399. Springer, September 2013. Full version published in International Journal of Information Security. © Springer.

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BibTeX

@inproceedings{ESORICS:BCFPPS13,
 	Author = {Colin Boyd and Cas Cremers and Mich{\` e}le Feltz and Kenneth G. Paterson and Bertram Poettering and Douglas Stebila},
 	Booktitle = {Proc. 18th European Symposium on Research in Computer Security (ESORICS) 2013},
 	Doi = {10.1007/978-3-642-40203-6\_22},
 	Editor = {Jason Crampton and Sushil Jajodia and Keith Mayes},
 	Month = {September},
 	Pages = {381--399},
 	Publisher = {Springer},
 	Series = {LNCS},
 	Title = {{ASICS}: Authenticated key exchange security incorporating certification systems},
 	Volume = {8134},
 	Year = {2013}
 }

Funding

• Australian Research Council (ARC) Discovery Project grant DP130104304
• ETH Research Grant ETH-30 09-3
• EPSRC Leadership Fellowship EP/H005455/1