请问 更为安全的 验证码，多谢
请教 更为安全的 验证码，谢谢
上图的字母为何种字体？这种粘连效果好看，不影响用户输入，同时也比较安全？
有人研究过这种写法吗，求源代码。。。
或者有更好更安全的验证码推荐？谢谢
另外，我刚才看了一下百度的验证码，发现每次请求前要先向服务器拿到一个类似KEY的东西，然后拿这个KEY请求才会出现不同的验证码，否则不断请求，返回的是同一个验证码。
这种做法一般是为了防止什么？防止有人刻意收集特殊码库吗，好像也没用？
------解决方案--------------------
验证码的安全程度跟OCR的能力有关――矛与盾的关系
很明显，复杂度――
繁体汉字 > 简体汉字 > 韩文 > 日文 > 其他符号 > 英文 > 阿拉伯数字 （有其他文字，这里不提）
字体不同、变形和干扰增加相应的复杂度，甚至提升级别，当然每一项都涉及客户端懂不懂输入的问题
因为GBK或big5都是包含简繁字，所以OCR做得好的话，简繁的复杂度差异就没有了
也可以结合#4进行“思考”验证，令到答案不显示在验证码中（比较困惑的是#4两个问题我都不会答
）由此可见越复杂、客户体验也越差，客户得失所以还是要慎重考虑
特别是手机用户，最好尽可能的减少输入
任何难度的增加，流失的潜在客户必定比拦截的恶意提交多，但固定客户不怎么流失，如果你认为随便舍弃一些正常的来访者（潜在客户）也没所谓就做吧
------解决方案--------------------
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