Physical Cryptanalysis

A complete break of the KeeLoq access control system.

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    Further details on our attacks and more background information can be found below.
documents and links


    Also have a look at the slides illustrating our findings briefly

    Previous Work

    The first cryptanalytic attack on KeeLoq was proposed by Bogdanov. The slides of his presentation are availablehere.

    ndesteege et al. improved the attacks, that are only applicable to IFF (Identify Friend or Foe) systems, to lower the complexity to 65536 known plain- and ciphertexts.


    The Wikipedia article gives some more background information on the KeeLoq cipher and existing theoretical attacks.