AES

Libraries/Esiur/Net/Packets/EpAuthPacket.cs

@@ -158,7 +158,8 @@ public class EpAuthPacket : Packet
         if (Command == EpAuthPacketCommand.Initialize)
         {
             AuthMode = (AuthenticationMode)(data[offset] >> 2 & 0x3);
-            EncryptionMode = (EncryptionMode)(data[offset++] & 0x7);
+            // Authentication occupies bits 2-3; encryption is confined to bits 0-1.
+            EncryptionMode = (EncryptionMode)(data[offset++] & 0x3);
         }
         else if (Command == EpAuthPacketCommand.Acknowledge)
         {

Libraries/Esiur/Net/Packets/EpAuthPacketHeader.cs

@@ -22,6 +22,7 @@ namespace Esiur.Net.Packets
         Identity,
         AuthenticationProtocol,
         AuthenticationData,
-        ErrorMessage
+        ErrorMessage,
+        CipherNonce
     }
 }