NDLI: Improving text passwords through persuasion

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Improving text passwords through persuasion

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Improving text passwords through persuasion

Content Provider	ACM Digital Library
Author	Chiasson, Sonia Forget, Alain van Oorschot, P. C. Biddle, Robert
Abstract	Password restriction policies and advice on creating secure passwords have limited effects on password strength. Influencing users to create more secure passwords remains an open problem. We have developed Persuasive Text Passwords (PTP), a text password creation system which leverages Persuasive Technology principles to influence users in creating more secure passwords without sacrificing usability. After users choose a password during creation, PTP improves its security by placing randomly-chosen characters at random positions into the password. Users may shuffle to be presented with randomly-chosen and positioned characters until they find a combination they feel is memorable. In this paper, we present an 83-participant user study testing four PTP variations. Our results show that the PTP variations significantly improved the security of users' passwords. We also found that those participants who had a high number of random characters placed into their passwords would deliberately choose weaker pre-improvement passwords to compensate for the memory load. As a consequence of this compensatory behaviour, there was a limit to the gain in password security achieved by PTP.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISBN	9781605582764
DOI	10.1145/1408664.1408666
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2008-07-23
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Usable security Persuasive technology Authentication Passwords
Content Type	Text
Resource Type	Article

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