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Avoid the implication that the systems are completely secure, especially given lack of a citation Tags: Visual edit Mobile edit Mobile web edit Advanced mobile edit |
Note that the algorithm has been broken Tags: Visual edit Mobile edit Mobile web edit Advanced mobile edit |
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* 34 bits are not encrypted : a 28-bit serial number, 4 bits of button information, and 2 status bits (repeat and low battery indicators).
* 32 bits are encrypted (the rolling code) : 4 bits of button information, 2 bits of OVR (used to extend counter value), 10 bits of DISC (discrimination value; often the low 10 bits of the serial number), and a 16-bit counter.<ref>{{Citation |last=Microchip |title=HC301 KeeLoq Code Hopping Encoder |year=2001 |id=DS21143B |publisher=Microchip Technology Inc. |url=http://ww1.microchip.com/downloads/en/devicedoc/21143b.pdf}}</ref><ref>{{cite web|url=https://garagedoorpitt.com/garage-door-remote-not-working-reasons/|title=Garage Door Remote Not Working Reasons| date=4 November 2021 }}</ref> In a resyncing situation, the encrypted 32 bits are replaced with a 32-bit seed value.
As detailed at [[KeeLoq]], the algorithm has been shown to be vulnerable to a variety of attacks, and has been completely [[Broken (cryptography)|broken]].
== Rolljam vulnerability ==
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