基于Web搜索引擎的CAPTCHA构造方法实现
关键词 图灵测试逆测试 图片搜索引擎 图像验证码 随机关键字
毕业论文设计说明书外文摘要
Title The Design and Implementation of CAPTCHA Construction
System Based on Web Search Engine
Abstract
Completely automated public Turing test to tell computers and humans apart (CAPTCHA), commonly known as the verification code technology, are widely used to prevent malicious programs from accessing and abusing of service resources in internet service. Traditional CAPTCHA constructions use the method of text recognition by displaying pictures with a certain amount of variation and fuzzy, and require users to identify the characters and then input them. With the development of character segmentation and optical character recognition (OCR), the majority of text CAPTCHA can be cracked by the method of pattern recognition and natural language understanding. The project designs and implements a new CAPTCHA construction based on web search engines, which random keyword searches and select a few related images with a random keyword by the image-searching capability of the search engine. The keyword-related pictures are mixed with a large number of unrelated pictures. It asks users identifying and selecting the related picture. As a result of the background information database from internet information, and the material selection and judgment basis from web search engine, this method has the dynamic mass of results of the code structure, which can resist the attacker's brute force or exhaustive attempt.
Keywords inverse Turing test web search engine image CAPTCHA random keyword
目 次
1 引言 1
1.1 课题背景 1
1.2 课题内容 1
1.3 研究意义 1
2 研究现状与相关技术 3
2.1 研究现状 3
2.2 相关技术 6
3 系统设计 11
3.1 算法描述 11
3.2 模块设计 13
4 系统实现与测试 17
4.1 系统实现 17
4.2 性能测试分析 20
结 论 26
致 谢 27
参考文献28
1 引言
1.1 课题背景
随着互联网的迅速普及和计算机网络技术的飞速发展，人机交互模式成为现代生活中不可或缺的部分，如在线订单、论坛发帖等。然而，互联网在方便了人们的工作和生活的同时，也带来了潜在的安全隐患。常有恶意的自动软件会滥用这些面向人类用户的网络服务，从而可能导致用户的个人信息被泄露、权益被侵犯。
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