期刊名称：International Journal of Network Security & Its Applications
印刷版ISSN：0975-2307
电子版ISSN：0974-9330
出版年度：2016
卷号：8
期号：4
页码：41
DOI：10.5121/ijnsa.2016.8404
出版社：Academy & Industry Research Collaboration Center (AIRCC)
摘要：An automated public Turing test to distinguish between computers and humans known as CAPTCHA is awidely used technique on many websites to protect their online services from malicious users. Twofundamental 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. Sothis paper proposes a benchmark for designing usable-secure text-based captchas based on a communitydriven evaluation of the usability and security aspects. Based on this benchmark, we develop four new textbasedcaptcha schemes, and conduct two separate experiments to evaluate both the security and usabilityperspectives of the developed schemes. The result of this evaluation indicates that the proposed benchmarkprovides a basis for designing usable-secure text-based captchas.
