Optimising CAPTCHA Generation
Optimising CAPTCHA Generation
复制标题
优化验证码生成
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Suliman A. Alsuhibany
中科院分区：
文献类型：
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作者：
Suliman A. Alsuhibany
CAPTCHA是一种可以自动区分人类和计算机程序的测试。它现在几乎是一种标准的安全技术，并在商业网站上得到了广泛的应用。健壮性和可用性是CAPTCHA的两个基本方面。文本CAPTCHA的鲁棒性通常由其抗分割机制的强度决定。群集字符在一起（CCT）的机制已被证明是合理的抵抗已知的攻击。另一方面，这样的方法会使字符很难识别，从而降低可用性。本文提出了一个优化器，自动增强CAPTCHA设计的可用性。这个优化器的一个关键点是，在不牺牲其鲁棒性的情况下提高了CAPTCHA方案的可用性。应用所提出的优化器将被证明可以显著提高CAPTCHA的可用性。
CAPTCHA is a test that can, automatically, tell human and computer programmes apart. It is now almost a standard security technology, and has found widespread application on commercial websites. Robustness and usability are two fundamental aspects with CAPTCHA. The robustness of a text CAPTCHA is typically determined by the strength of its segmentation-resistance mechanism. The mechanism of Crowding Character Together (CCT) has been shown to be reasonably resistant to known attacks. On the other hand, such an approach can reduce the usability by making characters very difficult to recognize. This paper proposes an optimiser that automatically enhances the usability of a CAPTCHA design. A key point of this optimiser is that the usability of the CAPTCHA scheme is improved without sacrificing its robustness level. Applying the proposed optimiser will be shown to achieve a significant improvement in the usability of CAPTCHA.