我试图“解码”以下Base64字符串:
OBFZDTcPCxlCKhdXCQ0kMQhKPh9uIgYIAQxALBtZAwUeOzcdcUEeW0dMO1kbPElWCV1ISFFKZ0kdWFlLAURPZhEFQVseXVtPOUUICVhMAzcfZ14AVEdIVVgfAUIBWVpOUlAeaUVMXFlKIy9rGUN0VF08Oz1POxFfTCcVFw1LMQNbBQYWAQ ==
这就是我对字符串本身的了解:
- 原始字符串首先通过以下代码传递:
private static string m000493(string p0, string p1)
{
StringBuilder builder = new StringBuilder(p0);
StringBuilder builder2 = new StringBuilder(p1);
StringBuilder builder3 = new StringBuilder(p0.Length);
int num = 0;
Label_0084:
while (num < builder.Length)
{
int num2 = 0;
while (num2 < p1.Length)
{
if ((num == builder.Length) || (num2 == builder2.Length))
{
MessageBox.Show("EH?");
goto Label_0084;
}
char ch = builder[num];
char ch2 = builder2[num2];
ch = (char)(ch ^ ch2);
builder3.Append(ch);
num2++;
num++;
}
}
return m0001cd(builder3.ToString());
}
代码中的 p1
部分应该是字符串“ _p0lizei.
” .
- 然后通过以下代码将其转换为Base64字符串:
private static string m0001cd(string p0)
{
string str2;
try
{
byte[] buffer = new byte[p0.Length];
str2 = Convert.ToBase64String(Encoding.UTF8.GetBytes(p0));
}
catch (Exception exception)
{
throw new Exception("Error in base64Encode" + exception.Message);
}
return str2;
}
问题是,如何解码Base64字符串,以便我可以找出原始字符串是什么?
2 回答
简单:
m000493
方法似乎执行某种XOR加密 . 这意味着可以使用相同的方法来加密和解密文本 . 你所要做的就是反向m0001cd
:return m0001cd(builder3.ToString());
更改为return builder3.ToString();
.