Abstract
High-speed, area-efficient, and low-power Montgomery modular multipliers for RSA algorithm have been developed for digital signature and user authentication in high-speed network systems and smart card LSIs. The multiplier-accumulators (MAC) in the developed Montgomery modular multipliers have a non-identical multiplicand/multiplier word length organization. This organization can eliminate the bandwidth bottleneck associated with a data memory, and enables to use a single-port memory for area and power reductions. The developed MAC is faster than the conventional identical word length organization due to the shortened critical path. For smart card applications, an area-efficient architecture with 42 kgates can produce 1.2 digital signatures in a second for 2,048-bit key length with the power consumption of 6.8 mW.
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