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{{redirect| Hopping code || frequency-hopping spread spectrum }}
A '''rolling 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. Rolling codes were introduced around the year 2001
== Techniques ==
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