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    <p>You should reuse the cypher instead of reinitialising it with the key and IV each time.</p> <p>The calling code:</p> <pre><code>var IV = new byte[8];//empty byte array var key = new byte[] { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef }; var data = Encoding.ASCII.GetBytes("7654321 Now is the time for "); DES DESalg = DES.Create(); DESalg.Mode = CipherMode.CBC; DESalg.Padding = PaddingMode.None; ICryptoTransform crypt = DESalg.CreateEncryptor(key, IV); var result = new byte[8]; int LoopCount = data.Length / 8; for (int i = 0; i &lt; LoopCount; i++) { Console.WriteLine("=============Round {0}==============", i + 1); byte[] part = new byte[8]; Array.Copy(data, i * 8, part, 0, 8); Console.WriteLine("Plain text : {0}", ByteArrayToString(part)); part = XorArray(part, result); Console.WriteLine("DES INPUT : {0}", ByteArrayToString(part)); result = EncryptPart(crypt, part); } int remain = data.Length % 8; if (remain != 0) { Console.WriteLine("===========Final Round=============="); byte[] LastPart = new byte[8];// Array.Copy(data, data.Length - remain, LastPart, 0, remain); Console.WriteLine("Plain text : " + ByteArrayToString(LastPart)); LastPart = XorArray(LastPart, result); Console.WriteLine("DES INPUT : " + ByteArrayToString(LastPart)); result = EncryptPart(crypt, LastPart); } Console.WriteLine("Result: {0}", ByteArrayToString(result)); </code></pre> <p>And the modified Encrypt part method:</p> <pre><code>public static byte[] EncryptPart(ICryptoTransform crypt, byte[] toEncrypt) { try { MemoryStream mStream = new MemoryStream(); CryptoStream cStream = new CryptoStream(mStream, crypt, CryptoStreamMode.Write); cStream.Write(toEncrypt, 0, toEncrypt.Length); cStream.FlushFinalBlock(); byte[] ret = mStream.ToArray(); cStream.Close(); mStream.Close(); Console.WriteLine("DES OUTPUT : " + ByteArrayToString(ret)); return ret; } catch (CryptographicException e) { Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); return null; } } </code></pre> <p>And the results:</p> <pre><code>=============Round 1============== Plain text : 3736353433323120 DES INPUT : 3736353433323120 DES OUTPUT : 21fb193693a16c28 =============Round 2============== Plain text : 4e6f772069732074 DES INPUT : 6f946e16fad24c5c DES OUTPUT : 6c463f0cb7167a6f =============Round 3============== Plain text : 68652074696d6520 DES INPUT : 04231f78de7b1f4f DES OUTPUT : 956ee891e889d91e ===========Final Round============ Plain text : 666f722000000000 DES INPUT : f3019ab1e889d91e DES OUTPUT : f1d30f6849312ca4 Result: f1d30f6849312ca4 </code></pre> <p>These values match the ones you specified, and those in this <a href="http://www.itl.nist.gov/fipspubs/fip113.htm" rel="nofollow">specification</a></p>
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    1. COThank you sga101 for your reply. your code returns the same result as my code returns. i found out that the sample returns the incorrect XOR result as we desired. the XOR result must be 6f946e16fbd24c5c while the sample result was 6f946e16fad24c5c for the step 2.
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    2. COI've added some print statements to the code I posted so you can see the results at each stage. I think they match the values you provided.
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    3. COThank you Sga101 for you reply. all the path you've done is correct. i finally figured out that the input array bytes which the sample gave me and i've used it as input text byte array was incorrect. i saw that you had used this code: "var data = Encoding.ASCII.GetBytes("7654321 Now is the time for ");" this code returns different byte array as the sample birgs:Text = 37363534333231204e6f77206873207468652074696d6520666f7220
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