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22 lip 2023 · In this work, we explore CAPTCHAs in the wild by evaluating users' solving performance and perceptions of unmodified currently-deployed CAPTCHAs.
25 mar 2021 · We first summarize existing text-based CAPTCHAs using a newly proposed taxonomy based on their resistance mechanisms and systematically review corresponding attacks in terms of methods and...
1 gru 2016 · To deal with variable-length Chinese character CAPTCHAs with noises, an automatic attacking approach is proposed, which includes preprocessing, character segmentation and character recognition.
Our offline attack tests achieve a success rate of 95.00% while taking 5.27 seconds per captcha, much higher than 79% success rate in related work. Our online and offline success rates are both higher than 92%, comparable with the success rates of six captcha-solving services with thousands of human labors.
Building upon and complementing prior work, this paper evaluates CAPTCHAS in the wild – specifically, the solv-ing times and user perceptions of unmodified (i.e., not re-implemented) currently-deployed CAPTCHA types.
Non-native speakers of English take longer to solve captchas, and are less accurate on captchas that include English words. Humans become slightly slower and slightly more accurate with age. Ph.D.s are the best at solving audio captchas. Finally our study shows that for attackers, it is more
Given this long-standing and still-ongoing arms race, it is important to investigate usability, solving performance, and user perceptions of modern captchas. 3, In this work, we do so via a large-scale (over 600 distinct users) 13-month real-world user study and post-study survey.
