Paper 2007/055
Cryptanalysis of the KeeLoq block cipher
Andrey Bogdanov
Abstract
KeeLoq is a block cipher used in numerous widespread passive entry and remote keyless entry systems as well as in various component identification applications. The KeeLoq algorithm has a 64-bit key and operates on 32-bit blocks. It is based on an NLFSR with a nonlinear feedback function of 5 variables. In this paper a key recovery attack with complexity of about $2^{52}$ steps is proposed (one step is equivalent to a single KeeLoq encryption operation). In our attack we use the techniques of guess-and-determine, slide, and distinguishing attacks. Several real-world applications are vulnerable to the attack. To our best knowledge this is the first paper to describe and cryptanalyze the KeeLoq block cipher.
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Published elsewhere. Unknown where it was published
- Keywords
- secret-key cryptographyblock cipherscryptanalysislinear cryptanalysisboolean functionsauthentication codesapplications
- Contact author(s)
- abogdanov @ crypto rub de
- History
- 2007-02-20: received
- Short URL
- https://ia.cr/2007/055
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2007/055,
author = {Andrey Bogdanov},
title = {Cryptanalysis of the {KeeLoq} block cipher},
howpublished = {Cryptology {ePrint} Archive, Paper 2007/055},
year = {2007},
url = {https://eprint.iacr.org/2007/055}
}
