Implementation of scalable elliptic curve cryptosystem crypto-accelerators for GF (2/sup m/)

Abstract

This paper focuses on designing elliptic curve crypto-accelerators in GF(2/sup m/) that are cryptographically scalable and hold some degree of reconfigurability. Previous work in elliptic curve crypto-accelerators focused on implementations using projective coordinate systems for specific field sizes. Their performance, scalar point multiplication per second (kP/s) was determined primarily by the underlying multiplier implementation. In addition, a multiplier only implementation and a multiplier plus divider implementation are compared in terms of critical path, area and area time (AT) product. Our multiplier only design, designed for high performance, can achieve 6314 kP/s for GF(2/sup 571/) and requires 47876 LUTs. Meanwhile our multiplier and divider design, with a greater degree of reconfigurability, can achieve 44 kP/s for GF(2/sup 571/). However, this design requires 27355 LUTs, and has a significantly higher AT product. It is shown that reconfigurability with the reduction polynomial significantly benefits from the addition of a low latency divider unit and scalar point multiplication in affine coordinates. In both cases the performance is limited by a critical path in the control logic.