I have seen a couple variants, but none of them have stuck around for long since they ended up being CnC for botnets/malware/etc. I think it would be safe to a

I have seen a couple variants, but none of them have stuck around for long since they ended up being CnC for botnets/malware/etc. I think it would be safe to assume there are also collision problems in unauthenticated ones as well...