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ISW
2010
Springer

Cryptanalysis of the Convex Hull Click Human Identification Protocol

13 years 9 months ago
Cryptanalysis of the Convex Hull Click Human Identification Protocol
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. In this paper we show two efficient probabilistic attacks on this protocol which reveal the user's secret after the observation of only a handful of authentication sessions. 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 which cross the threshold of usability. Keywords. Human Identification Protocols, Observer Attack
Hassan Jameel Asghar, Shujun Li, Josef Pieprzyk, H
Added 13 Feb 2011
Updated 13 Feb 2011
Type Journal
Year 2010
Where ISW
Authors Hassan Jameel Asghar, Shujun Li, Josef Pieprzyk, Huaxiong Wang
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