Suliman A. Alsuhibany
Computer Science Department, College
of Computer, Qassim University, Buridah, Saudi Arabia
ABSTRACT
An automated public Turing test to
distinguish between computers and humans known as CAPTCHA is a widely used
technique on many websites to protect their online services from malicious
users. Two fundamental aspects of captcha considered in various studies in the
literature are robustness and usability. A widely accepted standard benchmark,
to guide the text-based captcha developers is not yet available. So this paper
proposes a benchmark for designing usable-secure text-based captchas based on a
community driven evaluation of the usability and security aspects. Based on
this benchmark, we develop four new text based captcha schemes, and conduct two
separate experiments to evaluate both the security and usability perspectives
of the developed schemes. The result of this evaluation indicates that the
proposed benchmark provides a basis for designing usable-secure text-based
captchas.
KEYWORDS
Text-Based CAPTCHA, security,
usability, benchmark
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