I'm trying to implement a simple login module for JBoss AS 7.1.1, but the usernames sent from the client side are all nonsense hex strings like these:

a6e14a87-49f2-4d2c-8add-ba8fc7c699d9

I've tried to apply results from some other threads to my problem, but I can't get a handle on whether these are meaningless nonces or obfuscated in some way.