## On the Security of PAS (Predicate-Based Authentication Service)

2009
##### Authors
Asghar, Hassan Jameel
Pieprzyk, Josef
Schmitz, Roland
Wang, Huaxiong
##### Publication type
Contribution to a conference collection
##### Published in
2009 Annual Computer Security Applications Conference. - IEEE, 2009. - pp. 209-218. - ISBN 978-0-7695-3919-5
##### Abstract
Recently a new human authentication scheme called PAS (predicate-based authentication service) was proposed, which does not require the assistance of any supplementary device. The main security claim of PAS is to resist passive adversaries who can observe the whole authentication session between the human user and the remote server. In this paper we show that PAS is insecure against both brute force attack and a probabilistic attack. In particular, we show that its security against brute force attack was strongly overestimated. Furthermore, we introduce a probabilistic attack, which can break part of the password even with a very small number of observed authentication sessions. Although the proposed attack cannot completely break the password, it can downgrade the PAS system to a much weaker system similar to common OTP (one-time password) systems.
##### Subject (DDC)
004 Computer Science
##### Conference
2009 Annual Computer Security Applications Conference (ACSAC), Dec 7, 2009 - Dec 11, 2009, Honolulu, Hawaii, USA
##### Cite This
ISO 690LI, Shujun, Hassan Jameel ASGHAR, Josef PIEPRZYK, Ahmad-Reza SADEGHI, Roland SCHMITZ, Huaxiong WANG, 2009. On the Security of PAS (Predicate-Based Authentication Service). 2009 Annual Computer Security Applications Conference (ACSAC). Honolulu, Hawaii, USA, Dec 7, 2009 - Dec 11, 2009. In: 2009 Annual Computer Security Applications Conference. IEEE, pp. 209-218. ISBN 978-0-7695-3919-5. Available under: doi: 10.1109/ACSAC.2009.27
BibTex
@inproceedings{Li2009-12Secur-5986,
year={2009},
doi={10.1109/ACSAC.2009.27},
title={On the Security of PAS (Predicate-Based Authentication Service)},
isbn={978-0-7695-3919-5},
publisher={IEEE},
booktitle={2009 Annual Computer Security Applications Conference},
pages={209--218},
author={Li, Shujun and Asghar, Hassan Jameel and Pieprzyk, Josef and Sadeghi, Ahmad-Reza and Schmitz, Roland and Wang, Huaxiong}
}

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<dcterms:abstract xml:lang="eng">Recently a new human authentication scheme called PAS (predicate-based authentication service) was proposed, which does not require the assistance of any supplementary device. The main security claim of PAS is to resist passive adversaries who can observe the whole authentication session between the human user and the remote server. In this paper we show that PAS is insecure against both brute force attack and a probabilistic attack. In particular, we show that its security against brute force attack was strongly overestimated. Furthermore, we introduce a probabilistic attack, which can break part of the password even with a very small number of observed authentication sessions. Although the proposed attack cannot completely break the password, it can downgrade the PAS system to a much weaker system similar to common OTP (one-time password) systems.</dcterms:abstract>
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Yes