Rolling code
Changing keyless entry code for extra security / From Wikipedia, the free encyclopedia
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"Hopping code" redirects here. For other uses, see frequency-hopping spread spectrum.
A rolling code (or sometimes called a hopping code) is used in keyless entry systems to prevent a simple form of replay attack, 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.