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LOL: a highly flexible framework for designing stream ciphers

Science China(Information Sciences) 2024年第9期67卷 62-75页

作者： Dengguo FENG Lin JIAO Yonglin HAO Qunxiong ZHENG Wenling WU Wenfeng QI Lei ZHANG Liting ZHANG Siwei SUN Tian TIAN State Key Laboratory of Cryptology PLA Strategic Support Force Information Engineering University Institute of software Chinese Academy of Sciences Westone Cryptologic Research Center School of Cryptology University of Chinese Academy of Sciences

In this paper, we propose LOL, a general framework for designing blockwise stream ciphers. The proposed framework achieves ultrafast software implementations for ubiquitous virtual networks in 5G/6G environments and high-security levels for post-quantum cryptography. The LOL framework is structurally strong; furthermore, this framework and all its components enjoy high flexibility with various extensions. On the basis of the LOL framework, we propose new stream-cipher designs called LOL-MINI and LOL-DOUBLE with the support of the AES-NI and single instruction multiple data instructions. The former applies the basic LOL single mode, while the latter uses the extended parallel-dual mode. LOL-MINI and LOL-DOUBLE support 256-bit key length. Our thorough evaluations revealed that these cipher designs have 256-bit security margins against all existing cryptanalysis methods, including differential, linear, and integral. The software performances of LOL-MINI and LOL-DOUBLE can reach 89 and 135 Gbps. In addition to pure encryptions,the LOL-MINI and LOL-DOUBLE stream ciphers can be applied in a stream-cipher-then-MAC strategy to make AEAD schemes.

关键词： stream cipher 5G/6G mobile system fast software implementation

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A trinomial type of σ-LFSR oriented toward software implementation

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Science in China(Series F) 2007年第3期50卷 359-372页

作者： ZENG Guang HE KaiCheng HAN WenBao Department of Applied Mathematics Information Engineering University Zhengzhou 450002 China

In this paper, we introduce a new type of feedback shift register based on words, called G-linear feedback shift register （σ-LFSR） which can make full use of the instructions of modern CPUs so that we can find good σ-LFSR with simple structure and fast software implementation. After analysis, we find a class of simple σ-LFSR with maximal period and give an algorithm of searching for those σ-LFSRs. As a result, we provide a new optional fast component in the design of modern wordbased stream ciphers.

关键词： finite field stream cipher σ-LFSR primitive polynomial fast software implementation

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