Three Ways to Mount Distinguishing Attacks on Irregularly Clocked Stream Ciphers
Englund, Håkan LU and Johansson, Thomas LU
(2006)
In International Journal of Security and Networks
1(1/2).
p.95-102
- Abstract
- Many stream ciphers use irregular clocking to introduce nonlinearity
to the keystream. We present three distinguishers on irregularly
clocked linear feedback shift registers.
The general idea used is to find suitable linear combinations of
keystream bits, here called samples, that are drawn from a
biased distribution. We describe how to place windows around the
estimated positions around members of the linear combinations, and very
efficiently create many samples with low computational complexity.
We also describe ideas based on constructing samples consisting of
vectors of bits (words) instead of single binary samples.
These vectors based methods... (More) - Many stream ciphers use irregular clocking to introduce nonlinearity
to the keystream. We present three distinguishers on irregularly
clocked linear feedback shift registers.
The general idea used is to find suitable linear combinations of
keystream bits, here called samples, that are drawn from a
biased distribution. We describe how to place windows around the
estimated positions around members of the linear combinations, and very
efficiently create many samples with low computational complexity.
We also describe ideas based on constructing samples consisting of
vectors of bits (words) instead of single binary samples.
These vectors based methods can distinguish the cipher using fewer
keystream bits but sometimes require a higher computational complexity. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/601588
- author
- Englund, Håkan
LU
and Johansson, Thomas
LU
- organization
- publishing date
- 2006
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- distinguishing attack, irregularly clocked LFSR
- in
- International Journal of Security and Networks
- volume
- 1
- issue
- 1/2
- pages
- 95 - 102
- publisher
- Inderscience Publishers
- external identifiers
-
- scopus:72449209394
- language
- English
- LU publication?
- yes
- id
- 685b3728-0939-455a-9ec8-1874458569c0 (old id 601588)
- date added to LUP
- 2016-04-04 10:28:38
- date last changed
- 2023-09-06 06:14:42
@article{685b3728-0939-455a-9ec8-1874458569c0,
abstract = {{Many stream ciphers use irregular clocking to introduce nonlinearity<br/><br>
to the keystream. We present three distinguishers on irregularly<br/><br>
clocked linear feedback shift registers. <br/><br>
The general idea used is to find suitable linear combinations of<br/><br>
keystream bits, here called samples, that are drawn from a<br/><br>
biased distribution. We describe how to place windows around the<br/><br>
estimated positions around members of the linear combinations, and very<br/><br>
efficiently create many samples with low computational complexity. <br/><br>
We also describe ideas based on constructing samples consisting of<br/><br>
vectors of bits (words) instead of single binary samples. <br/><br>
These vectors based methods can distinguish the cipher using fewer<br/><br>
keystream bits but sometimes require a higher computational complexity.}},
author = {{Englund, Håkan and Johansson, Thomas}},
keywords = {{distinguishing attack; irregularly clocked LFSR}},
language = {{eng}},
number = {{1/2}},
pages = {{95--102}},
publisher = {{Inderscience Publishers}},
series = {{International Journal of Security and Networks}},
title = {{Three Ways to Mount Distinguishing Attacks on Irregularly Clocked Stream Ciphers}},
volume = {{1}},
year = {{2006}},
}