Abstract

In this paper we characterize all algorithms for obtaining the coefficients of ( Σ n−1 i=0 x i u i )( Σ n−1 i=0 y i u i ) mod P( u), where P( u) is an irreducible po lynomial of degree n, which use 2 n − 1 multiplications. It is shown that up to equivalence, all such algorithms are obtainable by first obtaining the coefficients of the product of two polynomials, and then reducing modulo the irreducible polynomial.

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