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And the user can manually force a lock, from the watch, overriding the proximity/signal strength. To intercept this the attacker would need to decipher the messages.

Not if the attacker stops the relay right after the PC is unlocked.



> Not if the attacker stops the relay right after the PC is unlocked.

No, if it happens the program falls back into the "user is away->lock the computer" mode.


So what happens if my watch shuts down for some reason while I'm using the computer?




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