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Linear complexity of sequences produced by single cycle t-function

the Journal of China Universities of Posts and telecommunications 2011年第4期18卷 123-128页

作者： WANG Yan HU Yu-pu LI Shun-bo YANG Yang Key Laboratory of Computer Networks and Information Security Ministry of Education Xidian University Xi'an 710071 China Department of Mathematics Xi'an University of Architecture and Technology Xi'an 710055 China

Four kinds of sequences generated by single cycle triangular function （t-function） are investigated to check the possibility for a single cycle t-function to be a cryptographic component in stream ciphers. Based on the special properties of single cycle t-function and an algorithm due to Wei, linear complexities of these four kinds of sequence are all acquired. the results show that single cycle t-function sequences have high linear complexity. therefore, t-function satisfies the essential requirements being a basic component of stream cipher.

关键词： stream cipher single cycle t-function linear complexity

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维普期刊数据库

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Autocorrelation of Sequences Generated by single cycle t-functions

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China Communications 2011年第5期8卷 144-150页

作者：王艳胡予濮李顺波杨旸 Ministry of Education Key Laboratory of Computer Networds and Information Security Xidian University Department of Mathematics Xi'an University of Architecture and Technology

Cryptographic properties of the single cycle t-function's output sequences are *** of autocorrelation functions of the kth coordinate sequence and bounds of state output sequence are calculated *** Maximum Sidelobe Ratio(MSR) of the kth coordinate sequence and the MSR of state output sequence are given *** bounds of autocorrelation functions show that the values of autocorrelation functions are large when shifts are *** of the autocorrelations between the state output sequence and coordinate output sequence are *** autocorrelation properties demonstrate that t-functions have cryptographic weaknesses and the illustration result shows coordinate output sequences have better autocorrelation than that of state output sequences.

关键词： cryptography pseudo-random sequences autocorrelation single cycle t-function

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维普期刊数据库

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New application methods for word-oriented cryptographic primitives

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Science China(Information Sciences) 2012年第9期55卷 2149-2160页

作者： YANG Yang 1,2,ZENG Guang 1,2,JIN ChengHui 1 & QU YunYing 1 1 Zhengzhou Information Science and technology Institute,Zhengzhou 450002,China 2 State Key Laboratory of Information Security,Institute of Software,Chinese Academy of Sciences,Beijing 100190,China Zhengzhou Information Science and technology Institute Zhengzhou China State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences Beijing China

Modern software oriented symmetric ciphers have become a key feature in utilizing word-oriented cryptographic *** the output sequence,in the order of its generation,of a word-oriented cryptographic primitive in the same way as traditional bit-oriented primitives,we can expose the intrinsic weakness of these primitives,especially for word-oriented linear feedback shift registers,t-functions,and so *** new methods for using word-oriented cryptographic primitives are presented in this paper,that is,the extracted state method and cascading extracted coordinate *** a t-function as an example,we research the different cryptographic properties of the output sequences of the original method and the two proposed methods,focusing mainly on period,linear complexity,and k-error linear *** conclusions show that the proposed methods could enhance at low cost the cryptographic properties of the output *** a result,since the new methods are simple and easy to implement,they could be used to design new word-oriented cryptographic primitives.

关键词： stream cipher single cycle t-function linear complexity k-error linear complexity

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