BitKey is interesting; a great allegory for unlocking access to a secure space:
Keyhotee ----> BitKey
Keyhotee ID ----> BitKey ID.
I think KeyMail and KeyID are catchy:
Keyhotee ----> KeyMail
Keyhotee ID ----> KeyID
That said, my vote still runs with bit-something. There is just too much momentum/value in attaching to the bit-space.
I like BitKey with BitKey ID, BitKey Mail, etc.
I Also thought of:
KeySet could contain KeyID, KeyMail, etc.
or
BitSet with BitID, BitMail, etc.
or
AngelSet with AngelID, AngelMail, etc.
or
BitAngel with BitID, BitMail, etc. (if "Bitangel" doesn't collide with "Bitangels")