You may have seen a Facebook post making the rounds about car thieves breaking into cars by mimicking your key fob. It isn’t a hoax, and police say they have evidence.

Wouters says he warned Tesla about his Model X keyless entry hacking technique in August. He says the company has told him it plans to start rolling out a software update to its key fobs this week ...

PayPal's use of key fobs represents what is called two-factor authentication, a login system in which an additional form of device-oriented verification is used in addition to a conventional password.