EVALUATION OF CAPTCHAs

Generation and Performance Evaluation of Synthetic Handwritten CAPTCHAs

In this paper we explore the potential of handwriting for use in CAPTCHAs. A synthetic handwriting generation method is presented, where the generated textlines need to be as close as possible to human handwriting without being writer-specific. The primary application of such a synthetic generator is in the design of handwritten CAPTCHAs (Completely Automatic Public Turing Test to Tell Computer...

Poster: Captchæ cker – Automating Usability-Security Evaluation of Textual CAPTCHAs

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چکیده ندارد.

[Position Paper] Motivating the Need for Evaluation Criteria for Captchas

We argue that a set of usability heuristics are needed for easy and quick evaluation of Captchas implementations. With this set of heuristics we contribute to sustain the Captcha Mantra: “Easy for humans, hard for machines”. In particular, the usability of Captcha schemes change radically when utilized on mobile environments. We are developing a set of heuristics for use by practitioners wishin...

Implicit CAPTCHAs

We propose a design methodology for “implicit” CAPTCHAs to relieve drawbacks of present technology. CAPTCHAs are tests administered automatically over networks that can distinguish between people and machines and thus protect web services from abuse by programs masquerading as human users. All existing CAPTCHAs’ challenges require a significant conscious effort by the person answering them — e....