Abstract. The NIST competition for developing the new cryptographic hash algorithm SHA-3 has entered its third round. One evaluation criterion is the ability of the candidate algorithm to be implemented on resource-constrained platforms. This includes FPGAs for embedded and hand-held devices. However, there has not been a comprehensive set of lightweight implementations for FPGAs reported to date. We hope to fill this gap with this paper in which we present lightweight implementations of all SHA-3 finalists and all round-2 candidates with the exception of SIMD. All implementations were designed to achieve maximum throughput while adhering to an area constraint of 400-600 slices and one Block RAM on Xilinx Spartan-3 devices. We also synthesized them for Virtex-V, Altera Cyclone-II, and the new Xilinx Spartan-6 devices.
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