Dec 8, 2017 · In this paper, we mainly made two contributions to CAPTCHA. First, we propose two novel image-based CAPTCHA schemes based on visual effects.
A set of new guidelines for the design of image-based CAPTCHA schemes based on visual effects is proposed that takes advantage of human ability on capturing ...
Von Ahn, L., Blum, M., Langford, J.: Telling humans and computers apart automatically. · Yan, J., El Ahmad, A.S.: A low-cost attack on a Microsoft CAPTCHA. · Gao, ...
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A first-of-its-kind large-scale user study involving 174 users is conducted to gauge and compare accuracy and usability of SEMAGE with existing state- ...
In this paper, a variant of image-based CAPTCHA is designed for visually challenged people. The main challenge is to identify human users from software robots.
Jan 10, 2024 · In this paper, we present an image-based CAPTCHA scheme using easily identifiable human appearance characteristics that overcomes the weaknesses ...
In this paper we have introduced a new form of captcha named CLAPTCHA. This Claptcha we believe can reform a new world of image and imagination based ...
Sound-based schemes typi- cally require the users to solve a speech recognition task, while the image-based schemes require the users to perform an image ...
Nov 1, 2019 · In this study, we proposed Grid-CAPTCHA and Font-CAPTCHA, two types of novel image-based CAPTCHAs. This is the first attempt of applying ...
May 2, 2023 · Characters from the image are partially embedded in animated text-based CAPTCHAs. ... Shaikh et al proposed a novel technique based on persistence ...