Starting around 1999, a great many graphical password schemes have been proposed as
alternatives to text-based password authentication. We provide a comprehensive overview …

The most common computer authentication method is to use alphanumerical usernames
and passwords. This method has been shown to have significant drawbacks. For example …

Inspired by an old Chinese game, Go, we have designed a new graphical password
scheme, Pass-Go, in which a user selects intersections on a grid as a way to input a …

Draw a secret (DAS) is a representative graphical password scheme. Rigorous theoretical
analysis suggests that DAS supports an overall password space larger than that of the …

The vulnerabilities of the textual password have been well known. Users tend to pick short
passwords or passwords that are easy to remember, which makes the passwords vulnerable …

Graphical password systems based upon the recall and reproduction of visual patterns (eg
as seen on the Google Android platform) are assumed to have desirable usability and …

We study the impact of selected parameters on the size of the password space for" Draw-A-
Secret"(DAS) graphical passwords. We examine the role of and relationships between the …

Authentication today mostly relies on passwords or personal identification numbers (PINs).
Therefore the average user has to remember an increasing amount of PINs and passwords …

Smartphones have emerged as a likely application area for graphical passwords, because
they are easier to input on touchscreens than text passwords. Extensive research on …

In commonplace text-based password schemes, users typically choose passwords that are
easy to recall, exhibit patterns, and are thus vulnerable to brute-force dictionary attacks. This …