How do garage door openers work?

Modern garage door openers transmit a radio signal that has a binary number encoded in it. The transmitter transmits a binary number, the receiver looks for that number, and it only opens the door if it “hears” the correct number. To prevent replay attacks (that is, to prevent a criminal from using a radio to listen to the code sent by a remote, then just playing the same code back to open the garage door), each time a code is used, a new code is generated. The radio transmitter and the radio receiver both contain a chip that uses the same system for generating new codes.

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