【分享:网马解密中级篇(Base64篇)】
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
**** Hidden Message *****
我们来看一个base64的源代码
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
将上述代码复制粘贴到notepad++,详细步骤参看下例截图:
**** Hidden Message *****
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):
上述代码复制粘贴到notepad++ 方法发给个入热水粉色发
页:
[1]