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    <p>You're not setting the <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.symmetricalgorithm.iv.aspx" rel="nofollow"><code>IV</code></a> property of <code>crypt</code>, so it's starting off as a random value each time. You need to set it to the same value when decrypting as when encrypting - like a salt for hashing. EDIT: Given the way ECB works, it looks like the IV may be ignored, which is why your previous code worked without storing it.</p> <p>EDIT: While the IV part is certainly required for non-ECB, it's not enough. I'm not sure what the rest of the problem is, although:</p> <ul> <li>The ECB cipher mode isn't recommended - any reason for using it?</li> <li>You may well end up running into problems due to padding; I don't know if <code>BinaryFormatter</code> handles that for you automatically, but it's worth looking into.</li> </ul> <p>EDIT: Doh - I've worked out the bigger problem; you should indeed be using <code>inBytes</code>, as per Elian's comment. Currently you're completely ignoring the cipher-text - that's got <em>no</em> chance of working!</p> <p>Here's a complete program showing the whole thing hanging together:</p> <pre><code>using System; using System.IO; using System.Text; using System.Security.Cryptography; using System.Runtime.Serialization.Formatters.Binary; class Test { static void Main() { byte[] data = Serialize("Some arbitrary test data", "pass"); object x = Deserialize(data, "pass"); Console.WriteLine(x); } private static SymmetricAlgorithm CreateCryptoServiceProvider(string key) { byte[] passwordHash; using (MD5 md5 = MD5.Create()) { // It's not clear why you're taking the hash of the password... passwordHash = md5.ComputeHash(Encoding.UTF8.GetBytes(key)); } var crypt = new TripleDESCryptoServiceProvider(); crypt.Key = passwordHash; crypt.Mode = CipherMode.CBC; // This is the default anyway - can remove crypt.Padding = PaddingMode.PKCS7; // Ditto // Fix this to use a randomly generated one and store it for real code. crypt.IV = new byte[crypt.BlockSize / 8]; return crypt; } public static byte[] Serialize(object obj, string key) { var provider = CreateCryptoServiceProvider(key); using (MemoryStream memory = new MemoryStream()) { using (CryptoStream stream = new CryptoStream( memory, provider.CreateEncryptor(), CryptoStreamMode.Write)) { BinaryFormatter formatter = new BinaryFormatter(); formatter.Serialize(stream, obj); } return memory.ToArray(); } } public static object Deserialize(byte[] inBytes, string key) { var provider = CreateCryptoServiceProvider(key); using (MemoryStream memory = new MemoryStream(inBytes)) { using (CryptoStream stream = new CryptoStream( memory, provider.CreateDecryptor(), CryptoStreamMode.Read)) { BinaryFormatter formatter = new BinaryFormatter(); return formatter.Deserialize(stream); } } } } </code></pre>
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    1. POEncrypting a struct, bad data error, what's causing that?
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    1. COI just set the IV and that still didnt work same error
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    2. CO@user1216963: What did you set it *to* though?
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    3. COWhen I Serialized the object i saved the got the random IV created then I used that when Deserializing
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