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Modular arithmetic apparatus and method selecting a base in the residue number system

Image Number 3 for United States Patent #7010560.

A modular arithmetic apparatus has a plurality of base parameter sets in read only memories. A base selection unit in the modular arithmetic apparatus selects one of the base parameters sets according to an input modulus p. A plurality of operation units 30, in the modular arithmetic apparatus, perform an arithmetic operation according to the selected base parameter set in parallel and obtain an arithmetic result.

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