“information that identifies your machine”
I’ve heard that each individual cpu chip has a unique identification that can be accessed and then obviously put into an outgoing message. The outgoing message could be spoofed too.
An outgoing message could be spoofed to anything desired.
Don’t know whether this is a weakness of the token scheme.
The ultimate hack would be someone standing beside the person with access ability threatening him if he doesn’t open the door.
That’s why they don’t put it out directly. Hash it, bury it in the token with a bunch other stuff including the random characters that are the heart of tokens.