Cryptanalysis of the convex hull click human identification protocol

Ashgar, Hassan Jameel, Li, Shujun, Pieprzyk, Josef, & Wang, Huaxiong (2013) Cryptanalysis of the convex hull click human identification protocol. International Journal of Information Security, 12(2), pp. 83-96.

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Abstract

Recently, a convex hull-based human identification protocol was proposed by Sobrado and Birget, whose steps can be performed by humans without additional aid. The main part of the protocol involves the user mentally forming a convex hull of secret icons in a set of graphical icons and then clicking randomly within this convex hull. While some rudimentary security issues of this protocol have been discussed, a comprehensive security analysis has been lacking. In this paper, we analyze the security of this convex hull-based protocol. In particular, we show two probabilistic attacks that reveal the user’s secret after the observation of only a handful of authentication sessions. These attacks can be efficiently implemented as their time and space complexities are considerably less than brute force attack. We show that while the first attack can be mitigated through appropriately chosen values of system parameters, the second attack succeeds with a non-negligible probability even with large system parameter values that cross the threshold of usability.

Impact and interest:

3 citations in Scopus
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2 citations in Web of Science®

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ID Code: 69326
Item Type: Journal Article
Refereed: Yes
Keywords: Human identification protocols, Observer attack, User authentication, Graphical passwords, Human-computer cryptography
DOI: 10.1007/s10207-012-0161-x
ISSN: 1615-5270
Subjects: Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000)
Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Springer-Verlag Berlin Heidelberg
Copyright Statement: The final publication is available at Springer via http://dx.doi.org/10.1007/s10207-012-0161-x
Deposited On: 27 Mar 2014 00:15
Last Modified: 18 Apr 2014 14:57

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