Rolling code: Difference between revisions

Revision as of 16:57, 29 April 2017

Revision as of 17:31, 1 May 2017

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{{redirect| hopping code || frequency-hopping spread spectrum }}

A '''trollingrolling code''' (or sometimes called a '''hopping code''') is used in [[keyless entry]] systems to prevent [[replay attack]]s, where an [[Eavesdropping|eavesdropper]] records the transmission and replays it at a later time to cause the receiver to 'unlock'. Such systems are typical in [[garage door opener]]s and keyless car entry systems.

== Techniques ==