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	Improved cryptanalysis of the stream cipher polar bear
	Huang Xiaoli; Wu Chuankun
刊名	Chinese journal of electronics
	2007-07-01
卷号	16期号:3页码:439-442
关键词	Cryptanalysis Polar bear Stream cipher Guess-and-determine attack Estream
ISSN号	1022-4653
通讯作者	Huang xiaoli()
英文摘要	This paper gives a guess-and-determine attack against polar bear, which is one of the candidate stream ciphers of estream. we chose three different cleartext groups under different assumptions, and only considered the first three cycles in each group. some values in each group were recovered through known constant values and some relations in the previous and current groups. we recover the initial state of polar bear completely with time complexity o(2(36.86)). in this respect, our results are much better than that of the two recent attacks whose time complexities are o(2(79)) and o(2(57.4)) respectively. our attack is based on known plaintext scenario which requires knowledge of three different cleartext groups, where the first 12 bytes of each group cleartext need to be known.
WOS关键词	ALGEBRAIC ATTACKS ; LINEAR FEEDBACK
WOS研究方向	Engineering
WOS类目	Engineering, Electrical & Electronic
语种	英语
出版者	TECHNOLOGY EXCHANGE LIMITED HONG KONG
WOS记录号	WOS:000247948400012
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2380567
专题	中国科学院大学
通讯作者	Huang Xiaoli
作者单位	1.Chinese Acad Sci, Inst Software, State Key Lab Informat Security, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Huang Xiaoli,Wu Chuankun. Improved cryptanalysis of the stream cipher polar bear[J]. Chinese journal of electronics,2007,16(3):439-442.
APA	Huang Xiaoli,&Wu Chuankun.(2007).Improved cryptanalysis of the stream cipher polar bear.Chinese journal of electronics,16(3),439-442.
MLA	Huang Xiaoli,et al."Improved cryptanalysis of the stream cipher polar bear".Chinese journal of electronics 16.3(2007):439-442.

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