Abstract
The vulnerabilities of the textual password have been well known. Users tend to pick short passwords or pass- words that are easy to remember, which makes the pass- words vulnerable for attackers to break. Furthermore, tex- tual password is vulnerable to shoulder-surng, hidden- camera and spyware attacks. Graphical password schemes have been proposed as a possible alternative to text-based scheme. However, they are mostly vulnerable to shoulder- surng. In this paper, we propose a Scalable Shoulder- Surng Resista ....etc

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Usable security has unique usability challenges because the need
for security often means that standard human-computer-interaction
approaches cannot be directly applied. An important usability goal
for authentication systems is to support users in selecting better
passwords, thus increasing security by expanding the effective
password space. In click-based graphical passwords, poorly
chosen passwords lead to the emergence of hotspo ....etc

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Various graphical password schemes have been proposed as alternatives to text-based passwords. Research and experience have shown that text-based passwords are fraught with both usability and security problems that make them less than desirable solutions. Psychology studies have revealed that the human brain is better at recognizing and recalling images than text graphical passwords are intended to capitalize on this human characteristic in hopes that by reducing the memory burden on users, coupled with a larger full password space offered by ....etc

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