정보보호학회논문지 (Journal of the Korea Institute of Information Security & Cryptology)

  • 제15권6호
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  • Pages.81-92
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  • 2005
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  • 1598-3986(pISSN)
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  • 2288-2715(eISSN)
한국정보보호학회 (Korea Institute of Information Security and Cryptology)
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효율성과 사용자의 프라이버시가 개선된 BCP 공개키 암호시스템

Improvement in efficiency and privacy on BCP public key cryptosystem

  • 발행 : 2005.12.01
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⟨ 이전 논문 다음 논문 ⟩

초록

이중 복호화 기능을 제공하는 BCP 공개키 암호는 Asiacrypt '03에서 Bresson, Catalano와 Pointcheval에 의해서 처음 제안되었고, 이는 Eurocrypt '02에서 Clamor와 Shoup이 제안한 공개키 암호에 기반하고 있다. 기존의 이중 복호화 기법은 Paillier 암호에서 사용되었던 환 $Z_n^2$ 위에서 설계되어 있으며, 이때 n은 두 소수 p,q의 곱 n=pq 이다. 본 논문에서는 환 $Z_p^2_q$ 위에서 이중 복호화 기능을 제공하는 공개키 암호를 제안한다. 본 논문에서 제안하는 공개키 암호는 기존의 것보다 효율적인 암${\cdot}$복호화 연산을 제공한다. 그리고 이전의 이중 복호화 기법이 사용자의 프라이버시 관점에서 취약하다는 점을 보이고 사용자의 프라이버시가 보강된 이중 복호화 기능을 제공하는 공개키 암호를 제안한다.

A novel public key cryptosystem that provides a double decryption mechanism is proposed at Asiacrypt '03 by Bresson, Catalano and Pointcheval based on the scheme proposed by Clamor and Shoup at Eurocrypt '02. Previous double decryrtion scheme is designed based on $Z_n^2$ where n=pq for two primes p,q. In this paper, we propose an efficient public key scheme with double decryption mechanism based on $Z_p^2_q$ for two primes p,q. Our scheme is more efficient an the previous schemes. Moreover, we review the previous schemes in a privacy point of view and propose a privacy enhanced double decryption scheme.

키워드

참고문헌

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