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Application of σ-LFSR in Stream Cipher AB |
Zeng Guang; Han Wen-bao; Fan Shu-qin |
Information Engineering Institute, Information Engineering University, Zhengzhou 450002, China |
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Abstract σ-LFSR is a word-oriented feedback shift register with a good tradeoff between security and efficiency. As an example, using σ-LFSR in ABC increases its period from 232(2127-1) to 232(2128-1) and, more important, its Hamming weight with the feedback polynomial of equivalent LFSR over binary field from 3 to 65, which is just half of the degree 128. Consequently, its resistance to fast correlation attack is consolidated while the guaranteed efficiency in software is almost the same.
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Received: 26 October 2007
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