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ATP-Optimized Implementation of Four-Way Toom-Cook Multiplications on FPGAs for Large Integer Arithmetic

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Abstract

Toom-Cook multiplication algorithm is one of the most efficient method compared to other traditional large-integer multiplication algorithms. However, in most cases, implementation of this algorithm in hardware is practically avoided due to presence of exact-divisions at intermediate steps of computation. Thus this paper proposes ways to overcome the limitation by designing a hardware-optimized, division-free Toom-4 multiplication algorithm. This is done by eliminating the effects of division due to odd factors in the denominator using a scaling factor, at the interpolation step of the algorithm. Further optimization is done by replacing the direct point-wise multiplication with an optimized Schoolbook multiplication. The overall performance of the proposed architecture is estimated using Area-Time-Product (ATP) and hardware implementation is done using Virtex-7 FPGA device in Xilinx-ISE platform. Practically, the proposed design performs better in terms of speed and resource utilization for higher input bits compared to other state-of-the-art designs; for example for 512 input bits, the percentage ATP of the proposed design is 75.077%, 98.822% and 57.316% superior performance compared to Traditional Schoolbook Multiplication, Karatsuba (Toom-2) multiplication and Toom-4 multiplication respectively.

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  1. Indian Institute of Information Technology Guwahati, Guwahati, India

    Monalisa Das & Babita Jajodia

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  1. Monalisa Das
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  2. Babita Jajodia
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All authors contributed to the study conception and design. All authors read and approved the final manuscript.

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Correspondence to Monalisa Das.

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Das, M., Jajodia, B. ATP-Optimized Implementation of Four-Way Toom-Cook Multiplications on FPGAs for Large Integer Arithmetic. Circuits Syst Signal Process (2025). https://doi.org/10.1007/s00034-024-02978-7

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