title: SagePay Protocol 3.00 Encryption Error with ASP.NET
body: <p>Spent the day struggling with getting AES/CBC/PCKS#5 encryption for SagePay Forms Protocol 3.00 </p>
  
  <p>Helpfully the SagePay .Net integration kit's functions for encryption are in a compiled DLL which makes the kit next to useless for understanding how the encryption needs to work.</p>
  
  <p>After many many attempts to get the encryption right I keep running into this error with SagePay:</p>
  
  <p>"5068: The encryption method is not supported by this protocol version"</p>
  
  <p>Anyone who has some working encryption / decryption functions that work with SagePay for Protocol 3.00 using AES/CBC/PCKS#5 I'd really appreciate them, as I'm sure many others would too...</p>
  
  <p>Thanks</p>