Strengthening CAPTCHA-based Web security

Graeme Baxter Bell

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Strengthening CAPTCHA-based Web security

机译：增强基于CAPTCHA的Web安全性

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Simple, universally applicable strategies can help any captcha–protected system resist automated attacks and can improve the ability of administrators to detect attacks. The strategies discussed here cause an exponential increase in the difficulty faced by automated attackers, while only increasing the inconvenience for human users in an approximately linear manner. These strategies are characterised using a new metric, the ‘Captcha Improvement Ratio’. The paper concludes that presenting multiple captcha systems together in random order may provide quantitative and qualitative advantages over many typical present–day captcha systems.

机译：简单，普遍适用的策略可以帮助任何受验证码保护的系统抵御自动攻击，并可以提高管理员检测攻击的能力。此处讨论的策略使自动攻击者面临的困难成倍增加，同时仅以近似线性的方式增加了对人类用户的不便。这些策略以新的指标“验证码改善率”为特征。本文得出的结论是，与许多典型的当今验证码系统相比，以随机顺序显示多个验证码系统可能在数量和质量上都具有优势。

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《First Monday》 |2012年第2期|共14页
作者
Graeme Baxter Bell;
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中图分类计算机网络;
关键词
Web securityCAPTCHAAbuse of websites and servicesCAPTCHA Improvement Ratio;

机译：网络安全CAPTCHA网站和服务滥用CAPTCHA改善率;

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7. Strengthening CAPTCHA-based Web security [O] . Bell, G.B. 2012

机译：增强基于CAPTCHA的Web安全性

Strengthening CAPTCHA-based Web security

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