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在互联网技术迅猛发展,为人们的日常工作生活带来便利的今天,信息安全问题也日益凸显。如,不法分子利用机器人程序自动完成注册、登陆、恶意投票、发送垃圾短信邮件、恶意尝试密码等。在此种情况下,验证码应运而生。由于验证码技术简单,容易实施,传输数据量较小,不少网站都采用了验证码技术来区分机器人和真实用户,以提高网站的安全性和抗攻击性,避免上述安全问题。本文主要介绍验证码的基本概念、验证码的作用和验证码的分类,以期读者对验证码形成初步认识。
With the rapid development of Internet technology and the convenience brought to people’s daily work and life, the problem of information security has also become increasingly prominent. For example, criminals use robot programs to automatically complete the registration, landing, malicious vote, send spam messages, malicious attempts to password. In this case, the verification code came into being. As the CAPTCHA is simple, easy to implement and has a small amount of data to be transmitted, many websites use CAPTCHA technology to differentiate between robots and real users so as to improve the security and anti-attack of the websites and avoid the above security problems. This paper introduces the basic concepts of CAPTCHA, the role of CAPTCHAs and the classification of CAPTCHAs, so that readers can get a preliminary understanding of captcha.