title: TripleDES key sizes - .NET vs Wikipedia
body: <p>According to <a href="http://en.wikipedia.org/wiki/Triple_DES">Wikipedia</a>, TripleDES supports 56, 112, and 168-bit key lengths, but the System.Cryptography.TripleDESCryptoServiceProvider.LegalKeySizes says it only accepts 128 and 192-bit key lengths.</p>
  
  <p>The system I'm developing needs to be interoperable (data encrypted by my code needs to be decryptable in PHP, Java, and Objective-C) and I don't who is correct in this case.</p>
  
  <p>So who should I believe? And how can I be sure my encrypted data is portable?</p>