PROSAGA码农传奇-C#/.net-c＃中的autokey vigenere解密

<div class =“post-text”itemprop =“text”>
  
    代码中的错误很少：
  
  
    1）看看这一行：
  
   <pre>
 <code>
 for (int i = 0; i < cipherText.Length - kslength; i++)

</code>
 </pre>
  
     <code>
 kslength = cipherText.Length - key.Length
 </code>
     所以你的代码是
  
   <pre>
 <code>
 for (int i = 0; i < key.Length; i++)

</code>
 </pre>
  
    密钥长度是＆lt;比文本长度所以你太早完成解密。
  
  
    2）
  
   <pre>
 <code>
 char temp = Convert.ToChar(p);
newpl[i] = temp;

</code>
 </pre>
  
    您解密了符号，但使用自动密钥解密，您应该将解密符号添加到您的密钥。
  
  
    3）
  
   <pre>
 <code>
 for (int i = 0; i < key.Length; i++)

</code>
 </pre>
  
    应该
     <code>
 NewKey.Length
 </code>
     相反，因为
     <code>
 key
 </code>
     修复＃2后我们真正需要的时间更长。
  
  
    的
      固定代码：
    </强>
  
   <pre>
 <code>
 string cipherText = "zicvtwqngkzeiigasxstslvvwla";
string key = "deceptive";

key = key.ToLower();
cipherText = cipherText.ToLower();

int klength = key.Length;

string pl = string.Empty;
char[] newpl = new char[cipherText.Length];
int a = Convert.ToInt32('a');
for (int i = 0; i < cipherText.Length; i++)
{
 int c = Convert.ToInt32(cipherText[i]) - a;
 if (c < 0) c += 26;
 int k = Convert.ToInt32(key[i]) - a;
 if (k < 0) k += 26;
 int p = (c - k);
 p %= 26;
 if (p < 0) p += 26;
 p += a;
 char temp = Convert.ToChar(p);
 key += temp;
 newpl[i] = temp;

}

char[] NewKey = new char[cipherText.Length];
int count = 0;
for (int i = 0; i < NewKey.Length; i++)
{
 NewKey[i] = key[i];
 count++;
}
int j = 0;
for (int i = count; i < cipherText.Length; i++)
{
 NewKey[i] = newpl[j];
 j++;
}

Console.WriteLine(NewKey);

for (int i = klength; i < cipherText.Length; i++)
{
 int c = Convert.ToInt32(cipherText[i]) - a;
 int k = Convert.ToInt32(NewKey[i]) - a;
 int p = (c - k);
 p %= 26;
 if (p < 0) p += 26;
 p += a;

char temp = Convert.ToChar(p);
    newpl[i] = temp;
}
pl = new string(newpl);
Console.WriteLine(pl);

</code>
 </pre>
  
    的
      输出：
    </强>
  
  <BLOCKQUOTE>
    
      deceptivewearediscoveredsav
    
    
      wearediscoveredsaveyourself
    
  </BLOCKQUOTE>
</DIV>