Low data complexity inversion attacks on stream ciphers via truncated compressed preimage sets

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	Low data complexity inversion attacks on stream ciphers via truncated compressed preimage sets
	Zhong, Xiao (1); Wang, Mingsheng (3); Zhang, Bin (1); Wu, Shengbao (1)
	2014
Conference Name	19th Australasian Conference on Information Security and Privacy, ACISP 2014
Pages	131-147
Conference Date	July 7, 2014 - July 9, 2014
Conference Place	Wollongong, NSW, Australia
Indexed Type	EI
Publish Place	Springer Verlag
ISSN	3029743
ISBN	9783319083438
Department	(1) Trusted Computing and Information Assurance Laboratory, Institute of Software, Chinese Academy of Sciences, Beijing, China; (2) Graduate School, Chinese Academy of Sciences, Beijing, China; (3) State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences, Beijing, China; (4) State Key Laboratory of Computer Science, Institute of Software, Chinese Academy of Sciences, Beijing, China
English Abstract	This paper focuses on the analysis of LFSR-based stream ciphers with low data complexity. We introduce a novel parameter called the k-th truncated compressed preimage set (TCP set), and propose a low data complexity attack to recover the initial LFSR state via the TCP sets. Our method costs very few keystream bits and less time than the brute force under some condition. We apply our method to a 90-stage LFSR-based keystream generator with filter Boolean function which can resist the algebraic attack and inversion attack given by Goli to the greatest extent. It needs only 10-bit keystream to recover the 90-bit initial state, costing less time and data than the algebraic attack. The time complexity is also less than that of the inversion attack. Moreover, we recover the 128-bit initial state of the stream cipher LILI-128 with our method. The data cost is just 9 keystream bits along with a memory cost of O(2 ^8.5), which is the minimum data cost to theoretically break LILI-128 so far as we know. The time complexity is O(2^122.4), better than the brute force. We also define a new security parameter called Tcomp and suggest a design criterion for the LFSR-based stream ciphers. © 2014 Springer International Publishing Switzerland.; This paper focuses on the analysis of LFSR-based stream ciphers with low data complexity. We introduce a novel parameter called the k-th truncated compressed preimage set (TCP set), and propose a low data complexity attack to recover the initial LFSR state via the TCP sets. Our method costs very few keystream bits and less time than the brute force under some condition. We apply our method to a 90-stage LFSR-based keystream generator with filter Boolean function which can resist the algebraic attack and inversion attack given by Goli to the greatest extent. It needs only 10-bit keystream to recover the 90-bit initial state, costing less time and data than the algebraic attack. The time complexity is also less than that of the inversion attack. Moreover, we recover the 128-bit initial state of the stream cipher LILI-128 with our method. The data cost is just 9 keystream bits along with a memory cost of O(2 ^8.5), which is the minimum data cost to theoretically break LILI-128 so far as we know. The time complexity is O(2^122.4), better than the brute force. We also define a new security parameter called Tcomp and suggest a design criterion for the LFSR-based stream ciphers. © 2014 Springer International Publishing Switzerland.
Language	英语
Content Type	会议论文
URI	http://ir.iscas.ac.cn/handle/311060/16589
Collection	中国科学院软件研究所
Recommended Citation GB/T 7714	Zhong, Xiao ,Wang, Mingsheng ,Zhang, Bin ,et al. Low data complexity inversion attacks on stream ciphers via truncated compressed preimage sets[C]. Springer Verlag,2014:131-147.

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