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1. 中国空间技术研究院总体设计部
2. Department of Electrical Engineering University of Southern California
3. Los Angeles
4. CA90007
Published:1985
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[1]王可,N.Glover,I.S.Reed,J.P.Huang,T.K.Truong.在特征为2的有限域上求对数和幂的方法[J].电子学报,1985(05):65-70.
Wang Ke. A Method for Finding Logarithms and Exponentials Over GF(2m)[J]. Acta Electronica Sinica, 1985, (5): 65-70.
令GF(q)是一个有限域
q=2
m
。通常在有限域上作乘法运算要用到q-1个非零元素的对数和反对数表。对于q=2
2n
而2
n
+1为素数的情况
本文证明一个域元素的对数和反对数
能够从两个小得多的2
n
+1和2
n
-1个元素表中求得。此算法要求的存贮量
由2·(2
2
n-1)个记忆单元减少为4·2
n
。本文提供的算法已在BCH码和RS码的编译码运算中得到应用
亦可应用在利用有限域特性构成的公开密钥系统中。
Let GF(q) be a finite field
where q = 2m. Multiplications are performed often using log and antilog tables of q - 1 non-zero field elements. It is shown that for q = 22n and 2n + 1 a prime
the log and antilog of a field element can be found with two substantially smaller tables of 2n + 1 and 2n - 1 elements respectivelly. The memory requirements for finding log and antilog are reduced from 2 · (22n - 1) to 4.2n memory elements.
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