Poster: Captchæ cker – Automating Usability-Security Evaluation of Textual CAPTCHAs
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منابع مشابه
Captchæcker: Reconfigurable CAPTCHAs based on automated security and usability analysis
CAPTCHAs have been deployed ubiquitously by web sites to combat automated malicious programs. Security against web bots and usability to legitimate users are two main goals that have to be simultaneously satisfied when designing a useful CAPTCHA scheme. However, there exists a well-known and intricate trade-off between these goals. So far, balancing this trade-off remains an art rather than a s...
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As protection of web applications are getting more and more important every day, CAPTCHAs are facing booming attention both by users and designers. Nowadays, it is well accepted that using visual concepts enhance security and usability of CAPTCHAs. There exist few major different ideas for designing image CAPTCHAs. Some methods apply a set of modifications such as rotations to the original imag...
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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 ...
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C olor plays a major role in increasing usability in systems ranging from TV remote controls (whose buttons are highlighted in different colors to make them easy to spot) to complicated GUIs (where users’ navigation from one area to another is effectively guided by different colors). When used properly, color can greatly enhance user interface designs.1 Color in interfaces is thus typically a u...
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We explore the robustness and usability of movingimage object recognition (video) captchas, designing and implementing automated attacks based on computer vision techniques. Our approach is suitable for broad classes of moving-image captchas involving rigid objects. We first present an attack that defeats instances of such a captcha (NuCaptcha) representing the state-ofthe-art, involving dynami...
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