The Montgomery Modular Inverse-Revisited

  • Authors:
  • E. Savas;Ç. K. Koç

  • Affiliations:
  • Oregon State Univ., Corvallis;Oregon State Univ., Corvallis

  • Venue:
  • IEEE Transactions on Computers - Special issue on computer arithmetic
  • Year:
  • 2000

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Abstract

We modify an algorithm given by Kaliski to compute the Montgomery inverse of an integer modulo a prime number. We also give a new definition of the Montgomery inverse, and introduce efficient algorithms for computing the classical modular inverse, the Kaliski-Montgomery inverse, and the new Montgomery inverse. The proposed algorithms are suitable for software implementations on general-purpose microprocessors.