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Captcha as Graphical Passwords-A New Security Primitive Based on Hard AI Problems

Lookup NU author(s): Dr Jeff Yan

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Abstract

Many security primitives are based on hard mathematical problems. Using hard AI problems for security is emerging as an exciting new paradigm, but has been under-explored. In this paper, we present a new security primitive based on hard AI problems, namely, a novel family of graphical password systems built on top of Captcha technology, which we call Captcha as graphical passwords (CaRP). CaRP is both a Captcha and a graphical password scheme. CaRP addresses a number of security problems altogether, such as online guessing attacks, relay attacks, and, if combined with dual-view technologies, shoulder-surfing attacks. Notably, a CaRP password can be found only probabilistically by automatic online guessing attacks even if the password is in the search set. CaRP also offers a novel approach to address the well-known image hotspot problem in popular graphical password systems, such as PassPoints, that often leads to weak password choices. CaRP is not a panacea, but it offers reasonable security and usability and appears to fit well with some practical applications for improving online security.

Publication metadata

Author(s): Zhu BB, Yan J, Bao GB, Yang MW, Xu N

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Information Forensics and Security

Year: 2014

Volume: 9

Issue: 6

Pages: 891-904

Print publication date: 19/03/2014

ISSN (print): 1556-6013

ISSN (electronic): 1556-6021

Publisher: IEEE

URL: http://dx.doi.org/10.1109/TIFS.2014.2312547

DOI: 10.1109/TIFS.2014.2312547

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