2010年04月26日   WordPress, 头条   8,107 次浏览

最近看到许多WordPress主题都被加密了,下面我来讲讲加密解密到底是怎么一回事。

有时候我们会在PHP文件中看到这样一些程序:

eval(base64_decode('VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZw=='));

其实这就是一段被加密过的代码,大家千万不要被这些类似乱码的东西吓到了。

只要懂一些编程知识的人都知道,其实代码中的“base64_decode”就是一个解密的函数。
我们来新建一个PHP文件,内容如下:

<?php
$str = 'VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZw==';
echo base64_decode($str);
?>

把这个文件传到PHP服务器上并打开,我们就可以看到原文了:

This is an encoded string

怎么样?是不是很简单呀,不管再怎么长的被加密过的代码,只是复制到上面那个PHP文件中就可以看到原文了。

下面我再来说说是怎么加密的,让大家彻底弄清里面的原理:
同样的,我们需要新建一个PHP文件,内容如下:

<?php
echo base64_encode("This is an encoded string");
?>

再在PHP服务器上打开这个文件,效果如下:

VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZw==

怎么样,是不是又看了之前那段加密的文字。是的,没错,加密就是通过“base64_encode”这个函数来实现的。

再说一点,可能大家碰到的加密函数不一定是这个,但是所用到的方法和原理是一样的,只要认真找就一定会找到方法的。

PS:尽管再这里教大家怎么破解加密了,但是大家还是要尊重版权,使用别人的东西一定要注明出处。

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