Doctoral dissertation
Usable Authentication with Recognition-based Graphical Passwords
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Abstract
The shift towards including human factors as part of system design has a direct impact on
the security of the system. The users' misunderstanding of how a secure mechanism
works usually results in security failures. People encounter security mechanisms daily,
most often required to authenticate themselves using knowledge-based schemes such as
passwords, the most common and prevalent type of authentication mechanisms plagued
with security and usability problems. As technical solutions have not resolved the
usability of passwords many passwords used in practice are either weak and usable or
secure and unusable. Hence, in recent years graphical passwords have been proposed as a
potential solution due to their improved usability features and the superior human ability
to recognize and remember images. This dissertation presents a thorough research on
usability and security features of recognition-based graphical passwords and proposes a
new approach to authentication suitable for ubiquitous environments.