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Bipartite Modular Multiplication Method

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2 Author(s)
Kaihara, M.E. ; EPFL, Lausanne ; Takagi, N.

This paper proposes a new modular multiplication method that uses Montgomery residues defined by a modulus M and a Montgomery radix R whose value is less than the modulus M. This condition enables the operand multiplier to be split into two parts that can be processed separately in parallel - increasing the calculation speed. The upper part of the split multiplier can be processed by calculating a product modulo M of the multiplicand and this part of the split multiplier. The lower part of the split multiplier can be processed by calculating a product modulo M of the multiplicand, this part of the split multiplier, and the inverse of a constant R. Two different implementations based on this method are proposed: One uses a classical modular multiplier and a Montgomery multiplier and the other generates partial products for each part of the split multiplier separately, which are added and accumulated in a single pipelined unit. A radix-4 version of a multiplier based on a radix-4 classical modular multiplier and a radix-4 Montgomery multiplier has been designed and simulated. The proposed method is also suitable for software implementation in a multiprocessor environment.

Published in:

Computers, IEEE Transactions on  (Volume:57 ,  Issue: 2 )

Date of Publication:

Feb. 2008

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