Rolling code: Difference between revisions

Revision as of 17:57, 14 October 2023

Revision as of 03:32, 24 November 2023

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== Rolling code vs. fixed code RF remote control ==

Remote controls send a digital code word to the receiver. If the receiver determines the codeword is acceptable, then the receiver will actuate the relay, unlock the door, or open the barrier. Simple remote control systems use a fixed code word; the code word that opens the gate today will also open the gate tomorrow. An attacker with an appropriate receiver could discover the code word and use it to gain access sometime later. More sophisticated remote control systems use a rolling code (or hopping code) that changes for every use. An attacker may be able to learn the code word that opened the door just now, but the receiver will not accept that code word for the foreseeable future. A rolling code system uses encryptioncryptographic methods that allow the remote control and the receiver to share codewords but make it difficult for an attacker to break the encryptioncryptography.

== KeeLoq ==