Some attacks on the Bit-search generator
Hell, Martin LU and Johansson, Thomas LU
(2005)
Fast Software Encryption 12th International Workshop, FSE 2005
3557.
p.215-227
- Abstract
- The bit-search generator (BSG) was proposed in 2004 and can be seen as a variant of the shrinking and self-shrinking generators. It has the advantage that it works at rate 1/3 using only one LFSR and some selection logic. We present various attacks on the BSG based on the fact that the output sequence can be uniquely defined by the differential of the input sequence. By knowing only a small part of the output sequence we can reconstruct the key with complexity O(L(3)2(0.5L)). This complexity can be significantly reduced in a data/time tradeoff manner to achieve a complexity of O(L(3)2(0.27)L) if we have O(2(0.27L)) of keystream. We also propose a distinguishing attack that can be very efficient if the feedback polynomial is not carefully... (More)
- The bit-search generator (BSG) was proposed in 2004 and can be seen as a variant of the shrinking and self-shrinking generators. It has the advantage that it works at rate 1/3 using only one LFSR and some selection logic. We present various attacks on the BSG based on the fact that the output sequence can be uniquely defined by the differential of the input sequence. By knowing only a small part of the output sequence we can reconstruct the key with complexity O(L(3)2(0.5L)). This complexity can be significantly reduced in a data/time tradeoff manner to achieve a complexity of O(L(3)2(0.27)L) if we have O(2(0.27L)) of keystream. We also propose a distinguishing attack that can be very efficient if the feedback polynomial is not carefully chosen. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/226843
- author
- Hell, Martin
LU
and Johansson, Thomas
LU
- organization
- publishing date
- 2005
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- Fast Software Encryption / Lecture Notes in Computer Science
- volume
- 3557
- pages
- 215 - 227
- publisher
- Springer
- conference name
- Fast Software Encryption 12th International Workshop, FSE 2005
- conference location
- Paris, France
- conference dates
- 2005-02-21 - 2005-02-23
- external identifiers
-
- wos:000230869900014
- scopus:26444452700
- ISSN
- 0302-9743
- 1611-3349
- ISBN
- 978-3-540-26541-2
- DOI
- 10.1007/11502760_14
- language
- English
- LU publication?
- yes
- id
- 86081059-bab6-4681-8d57-e3ee1a5a681b (old id 226843)
- date added to LUP
- 2016-04-01 11:47:30
- date last changed
- 2024-03-25 13:56:15
@inproceedings{86081059-bab6-4681-8d57-e3ee1a5a681b,
abstract = {{The bit-search generator (BSG) was proposed in 2004 and can be seen as a variant of the shrinking and self-shrinking generators. It has the advantage that it works at rate 1/3 using only one LFSR and some selection logic. We present various attacks on the BSG based on the fact that the output sequence can be uniquely defined by the differential of the input sequence. By knowing only a small part of the output sequence we can reconstruct the key with complexity O(L(3)2(0.5L)). This complexity can be significantly reduced in a data/time tradeoff manner to achieve a complexity of O(L(3)2(0.27)L) if we have O(2(0.27L)) of keystream. We also propose a distinguishing attack that can be very efficient if the feedback polynomial is not carefully chosen.}},
author = {{Hell, Martin and Johansson, Thomas}},
booktitle = {{Fast Software Encryption / Lecture Notes in Computer Science}},
isbn = {{978-3-540-26541-2}},
issn = {{0302-9743}},
language = {{eng}},
pages = {{215--227}},
publisher = {{Springer}},
title = {{Some attacks on the Bit-search generator}},
url = {{http://dx.doi.org/10.1007/11502760_14}},
doi = {{10.1007/11502760_14}},
volume = {{3557}},
year = {{2005}},
}