A rolling code (or sometimes called a hopping code) is used in keyless entry systems to prevent replay attacks, where an eavesdropper records the transmission and replays it at a later time to cause the receiver to 'unlock'.
Such systems are typical in garage door openers and keyless car entry systems. The most widely spread algorithm for code hopping systems today is KeeLoq.
Read more about Rolling Code: Techniques, Application in RF Remote Control, Rolling Code Vs. Fixed Code RF Remote Control, See Also
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