도도의 초록누리

using System.Security; 

namespace ConsoleApplication1
{
    class Program
    {
        // Rfc2898DeriveBytes constants:
        public readonly byte[] salt = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

      // Must be at least eight bytes.  MAKE THIS SALTIER!
      public const int iterations = 1042; // Recommendation is >= 1000.

        public static void Main(string[] args)
        {

     try
     {
         string password = @"myKey123"; // Your Key Here
         UnicodeEncoding UE = new UnicodeEncoding();
         byte[] key = UE.GetBytes(password);

         string cryptFile = outputFile;
         FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);

         RijndaelManaged RMCrypto = new RijndaelManaged();

         CryptoStream cs = new CryptoStream(fsCrypt,
         RMCrypto.CreateEncryptor(key, key),
         CryptoStreamMode.Write);

         FileStream fsIn = new FileStream(inputFile, FileMode.Open);

         int data;
         while ((data = fsIn.ReadByte()) != -1)
              cs.WriteByte((byte)data);

              fsIn.Close();
              cs.Close();
              fsCrypt.Close();
        }
     catch
     {

     }
}

    {
        string password = @"myKey123"; // Your Key Here

        UnicodeEncoding UE = new UnicodeEncoding();
        byte[] key = UE.GetBytes(password);

        FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);

        RijndaelManaged RMCrypto = new RijndaelManaged();

        CryptoStream cs = new CryptoStream(fsCrypt,
        RMCrypto.CreateDecryptor(key, key),
        CryptoStreamMode.Read);

        FileStream fsOut = new FileStream(outputFile, FileMode.Create);

        int data;
        while ((data = cs.ReadByte()) != -1)
             fsOut.WriteByte((byte)data);

             fsOut.Close();
             cs.Close();
             fsCrypt.Close();

        }
}