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    <p>Why not use the .Net Cryptography Library ,it has DES and Triple DES implementations. I would suggest not to reinvent the wheel and use the library ,Well if you need to practice and sharpen your skills than its great to roll out your own implementation ! :)</p> <pre><code>private static void EncryptData(String inName, String outName, byte[] tdesKey, byte[] tdesIV) { //Create the file streams to handle the input and output files. FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read); FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write); fout.SetLength(0); //Create variables to help with read and write. byte[] bin = new byte[100]; //This is intermediate storage for the encryption. long rdlen = 0; //This is the total number of bytes written. long totlen = fin.Length; //This is the total length of the input file. int len; //This is the number of bytes to be written at a time. TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider(); CryptoStream encStream = new CryptoStream(fout, tdes.CreateEncryptor(tdesKey, tdesIV), CryptoStreamMode.Write); Console.WriteLine("Encrypting..."); //Read from the input file, then encrypt and write to the output file. while(rdlen &lt; totlen) { len = fin.Read(bin, 0, 100); encStream.Write(bin, 0, len); rdlen = rdlen + len; Console.WriteLine("{0} bytes processed", rdlen); } encStream.Close(); } </code></pre> <p><br/> <strong>Source:</strong> <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.tripledes.aspx" rel="nofollow">MSDN</a></p>
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    1. POHow to implement Triple DES in C# (complete example)
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