Dienstag, 2. November 2010

[HIForum] [Kolloquium] Kolloquium am 15.11.2010

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Einladung zum
 
Informatischen Kolloquium Hamburg und CINACS-Kolloquium
 
Montag, 15. November 2010
um 17 Uhr c.t.
Vogt-Kölln-Str. 30
22527 Hamburg
Konrad-Zuse-Hörsaal
Gebäude B, Raum 201
 
 
Professor Steffen Werner, Ph.D.
Department of Psychology and Communication Studies
Human Factors Program
University of Idaho
 
*The human element in computer security - Graphical passcodes as a means to create secure authentication systems*
 
Abstract:
User authentication is a central component within the field of HCI security and its importance is growing with the increasing number of electronically available assets such as bank accounts, retirement accounts, medical records, and other personal information.  Dwarfing the use of token and biometrically based authentication schemes, authentication via passwords is still the most widespread mechanism used.  Common alphanumeric passwords are an example of the larger set of general cognitive authentication methods, which presents a unique optimization problem to cognitive psychologists.  The design of a successful ³password² system thus can be viewed as the optimization of the ³true² entropy of a password space and the ability of a human user to acquire, remember, and reproduce a ³password² for an authentication challenge.  In our lab we have investigated a number of alternatives to common alphanumeric passwords ­ mainly graphical or locimetric passcode systems.  Our novel Composite Scene Authentication (CSA) approach assigns users composite visual scenes to increase the memorability of the pseudo-randomly generated passcodes up to a complexity of 46.5 bits.  Initial results in a series of large evaluation studies using more than 600 participants show a clear advantage in memorability of well-designed graphical passcodes over alphanumeric passwords of similar complexity.  Not surprisingly, many other popular approaches to graphical passwords fall far short of expectations.  Based on our empirical results, central features of a successful graphical authentication system will be highlighted.
 
Kontakt:
Prof. Dr. Christopher Habel
Tel. +49 40 42883 2417
 
 

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