Update captcha.md

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验证码(CAPTCHA)是“Completely Automated Public Turing test to tell Computers and Humans Apart”(全自动区分计算机和人类的图灵测试)的缩写,是一种区分用户是计算机还是人的公共全自动程序。可以防止用户用特定程序暴力破解方式进行不断的登陆尝试。
文本验证码
<b>文本验证码</b>
<img src="{{ "/images/authn/captcha_text.png" | prepend: site.baseurl }}?{{ site.time | date: "%Y%m%d%H%M" }}" alt=""/>
算术验证码
<b>算术验证码</b>
<img src="{{ "/images/authn/captcha_arithmetic.png" | prepend: site.baseurl }}?{{ site.time | date: "%Y%m%d%H%M" }}" alt=""/>
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