Plaintext + Cipher

Question

This is a continuing from previous forum that has been removed for no reason why! - I just don't understand that all the thread seems disappear. I think something wrong with the setting anyhow here is the latest one: Vulpes, I think for now we use the C sharpe version with these Keys and cipher text.

The code still in testing so will see what went wrong on here. Thanks.

PS: Could it be that the text is encoded with padding?

using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;


class Program
{
    static void Main()
    {
       Encoding ascii = Encoding.ASCII;        
       byte[] key = {0x9b, 0x4c, 0x3d, 0x50, 0x3b, 0x00, 0x00, 0x00};  // use null bytes initially 
       byte[] cipherText2 = {0x2e, 0x4c, 0x56, 0xe7, 0xf9, 0xf9, 0xd0, 0xef,
                             0xab, 0x3c, 0x4d, 0x2e, 0x2f, 0x21, 0xf5, 0xcd,
                             0x8e, 0x9e, 0xd0, 0xf8, 0xe7, 0xa8, 0xd0, 0xbc}; 
       byte[] cipherText = null;
       byte[] plainText = null;
       string s = null;
       bool isCandidate = false; 
       StreamWriter sw = new StreamWriter("candidates.txt");
       for(int i = 0; i < 255; i += 2)
       {
           for(int j = 0; j < 255; j += 2)
           {
               for(int k = 0; k < 255; k += 2)
               {
                  key[5] = (byte)i;
                  key[6] = (byte)j;
                  key[7] = (byte)k;                  
                  cipherText = DesDecrypt(cipherText2, key); 
                  plainText = DesDecrypt(cipherText, key);
                  s = ascii.GetString(plainText);
                  isCandidate = true;
                  foreach(char c in s)
                  {
                     int ascval = (int)c;
                     if (ascval == 63 || ascval < 32 || ascval > 126) 
                     {  
                        isCandidate = false;
                        break;
                     }
                  }
                  if (isCandidate)
                  {
                     string result = String.Format("{0} : {1} : {2} - {3}", i, j, k, s); // now includes bytes
                     Console.WriteLine(result); // now writes candidate to console as well  
                     sw.WriteLine(result);                    
                  }
               } 
            }
            Console.WriteLine("i = {0} completed", i); // indication of where we're at 
       }
       sw.Close();
    }


    static byte[] DesEncrypt(byte[] plainText, byte[] key)
    {
       // Create a new DES key.
       DESCryptoServiceProvider des = new DESCryptoServiceProvider();
       // Set the KeySize = 64 for 56-bit DES encryption.
       // The msb of each byte is a parity bit, so the key length is actually 56 bits.
       des.KeySize = 64;
       des.Key = key;
       des.Mode = CipherMode.ECB;
       des.Padding = PaddingMode.None;


       ICryptoTransform ic = des.CreateEncryptor();


       byte[] enc = ic.TransformFinalBlock(plainText, 0, 24); // 24 bytes assumed


       return enc;
    }


    static byte[] DesDecrypt(byte[] cipherText, byte[] key)
    {
       DESCryptoServiceProvider des = new DESCryptoServiceProvider();


       des.KeySize = 64;
       des.Key = key;
       des.Mode = CipherMode.ECB;
       des.Padding = PaddingMode.None;


       ICryptoTransform ic = des.CreateDecryptor();


       byte[] dec = ic.TransformFinalBlock(cipherText, 0, 24);


       return dec;
   }


}