【分享：网马解密中级篇(Base64篇)】

KingSolomon

一. Base64加密原理：(摘自小聪大牛的博客)

  把每三个字符，共24位2进制的ASCII码，折分成连续4个6位的ASCII码，再在每个ASCII码前面补00变成8位， 最后对应一个码表来变成编码字符：

码表为（从0～63分别依次对应）：
0对应A………………………………………………………………………………63对应/
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/
如果最后不够3位数，则补0，这时后面对应的编码是“=”
例：原文：                a                  b                c
　　ASCII码：    01100001 | 01100010 | 01100011
        分成4个：    011000 | 010110 | 001001 | 100011
        补足位数： 00011000 | 00010110 | 00001001 | 00100011
        数值大小：        24                22                9                  35
        对应编码：        Y                  W                J                  j
        编码结果：    YWJj

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我们来看一个base64的源代码

1. 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

复制代码

将上述代码复制粘贴到notepad++，详细步骤参看下例截图：

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最终的解密结果相见下图，红色框中内容均为病毒的下载地址(可能已失效)：

minminvip

上述代码复制粘贴到notepad++

财神驾到

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