The KIPS Transactions:PartC (정보처리학회논문지C)

Korea Information Processing Society (한국정보처리학회)
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VLSI Architecture for High Speed Implementation of Elliptic Curve Cryptographic Systems

타원곡선 암호 시스템의 고속 구현을 위한 VLSI 구조

  • 김창훈 (대구대학교 컴퓨터.IT 공학부)
  • Published : 2008.04.30
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Abstract

In this paper, we propose a high performance elliptic curve cryptographic processor over $GF(2^{163})$. The proposed architecture is based on a modified Lopez-Dahab elliptic curve point multiplication algorithm and uses Gaussian normal basis for $GF(2^{163})$ field arithmetic. To achieve a high throughput rates, we design two new word-level arithmetic units over $GF(2^{163})$ and derive a parallelized elliptic curve point doubling and point addition algorithm with uniform addressing based on the Lopez-Dahab method. We implement our design using Xilinx XC4VLX80 FPGA device which uses 24,263 slices and has a maximum frequency of 143MHz. Our design is roughly 4.8 times faster with 2 times increased hardware complexity compared with the previous hardware implementation proposed by Shu. et. al. Therefore, the proposed elliptic curve cryptographic processor is well suited to elliptic curve cryptosystems requiring high throughput rates such as network processors and web servers.

본 논문에서는 $GF(2^{163})$타원곡선 암호 프로세서를 제안한다. 제안한 암호 프로세서는 타원곡선 정수 곱셈을 위해 수정된 Loez-Dahab Montgomery 알고리즘을 채택하고, $GF(2^{163})$상의 산술 연산을 위해 가우시안 정규 기저(Gaussian Normal Basis: GNB)를 이용한다. 높은 처리율을 위해 Lopez-Dahab 방식에 기반한 규칙적인 주소화 방식의 병렬 타원곡선 좌표 덧셈 및 배 연산 알고리즘을 유도하고 $GF(2^{163})$상의 연산을 수행하는 두 개의 워드-레벨 산술 연산기(Arithmetic Unit: AU)를 설계한다. 제안된 타원곡선 암호 프로세서는 Xilinx사의 XC4VLX80 FPGA 디바이스에 구현되었으며, 24,263개의 슬라이스를 사용하고 최대 동작주파수는 143MHz이다. 제안된 구조를 Shu 등의 하드웨어 구현과 비교했을 때 하드웨어 복잡도는 약 2배 증가 하였지만 4.8배의 속도 향상을 보인다. 따라서 제안된 타원곡선 암호 프로세서는 네트워크 프로세서와 웹 서버등과 같은 높은 처리율을 요구하는 타원곡선 암호시스템에 적합하다.

Keywords

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