A linear time algorithm for residue computation and a fast algorithm for division with a sparse divisor

  • Authors:
  • Michael Kaminski

  • Affiliations:
  • Technion-Israel Institute of Technology, Haifa, Israel

  • Venue:
  • Journal of the ACM (JACM)
  • Year:
  • 1987

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Abstract

An algorithm is presented to compute the residue of a polynomial over a finite field of degree n modulo a polynomial of degree O(log n) in O(n) algebraic operations. This algorithm can be implemented on a Turing machine. The implementation is based on Turing machine procedure that divides a polynomial of degree n by a sparse polynomial with k nonzero coefficients in O(kn) steps. This algorithm can be adapted to compute the residue of a number of length n modulo a number of length O(log n) in O(n) bit operations.