| 摘要 |
A method and device for computing the multiplicative inverse of element x in Galois field GF(p2m) is proposed. In particular, when p is a prime number and m is an integer, the inverse may be constructed based on the observation that xpm+1 is en element in sub-field GF(pm) and the inverse of xpm+1 can be carried out in the sub-field. The inverse of X may be obtained by multiplying x−1=(xpm+1)−1 by xpm.
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