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    copied!<p>If you would like something that would be difficult to trace and you don;t mind it being 16 characters, you could use something like this that includes some random numbers and mixes the byte positions of the original input with them: (EDITED to make a bit more untraceable, by XOR-ing with the generated random numbers).</p> <pre><code>public static class OrderIdRandomizer { private static readonly Random _rnd = new Random(); public static string GenerateFor(int orderId) { var rndBytes = new byte[4]; _rnd.NextBytes(rndBytes); var bytes = new byte[] { (byte)rndBytes[0], (byte)(((byte)(orderId &gt;&gt; 8)) ^ rndBytes[0]), (byte)(((byte)(orderId &gt;&gt; 24)) ^ rndBytes[1]), (byte)rndBytes[1], (byte)(((byte)(orderId &gt;&gt; 16)) ^ rndBytes[2]), (byte)rndBytes[2], (byte)(((byte)(orderId)) ^ rndBytes[3]), (byte)rndBytes[3], }; return string.Concat(bytes.Select(b =&gt; b.ToString("X2"))); } public static int ReconstructFrom(string generatedId) { if (generatedId == null || generatedId.Length != 16) throw new InvalidDataException("Invalid generated order id"); var bytes = new byte[8]; for (int i = 0; i &lt; 8; i++) bytes[i] = byte.Parse(generatedId.Substring(i * 2, 2), System.Globalization.NumberStyles.HexNumber); return (int)( ((bytes[2] ^ bytes[3]) &lt;&lt; 24) | ((bytes[4] ^ bytes[5]) &lt;&lt; 16) | ((bytes[1] ^ bytes[0]) &lt;&lt; 8) | ((bytes[6] ^ bytes[7]))); } } </code></pre> <p>Usage:</p> <pre><code>var obfuscatedId = OrderIdRandomizer.GenerateFor(123456); Console.WriteLine(obfuscatedId); Console.WriteLine(OrderIdRandomizer.ReconstructFrom(obfuscatedId)); </code></pre> <p>Disadvantage: If the algorithm is know, it is obviously easy to break. Advantage: It is completely custom, i.e. not an established algorithm like MD5 that might be easier to guess/crack if you do not know what algorithm is being used.</p>
 

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