Method and apparatus for providing flexible bit-length...

Details Method and apparatus for providing flexible bit-length... Method and apparatus for providing flexible bit-length...

G - Physics

06

F

G06F 7/72 (2006.01) H04L 9/06 (2006.01) G09C 5/00 (2006.01)

Patent

CA 2738606

Techniques are disclosed for utilizing a block Montgomery machine designed only to operate at a fixed block length to perform operations using non-block length (flexible) moduli. In one embodiment, a new modulus n' is obtained having a block length equal to the fixed block length of the Montgomery machine or a multiple thereof. At least one modular additive operation is performed with the new modulus n', and at least one modular multiplicative operation is performed with the non-block length modulus n. In this way, the result of the at least one additive operation is sufficiently reduced when a carry stems from the additive operation.

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