한국정보보호학회:학술대회논문집 (Proceedings of the Korea Institutes of Information Security and Cryptology Conference)

한국정보보호학회 (Korea Institute of Information Security and Cryptology)
권호 표지

Forward-Secure Blind Signature Scheme Based on the Strong RSA Assumption

  • Duc, Dang-Nguyen (IRIS, Information and Communication University (ICU)) ;
  • Cheon, Jung-Hee (Department of Mathematic, Seoul National University) ;
  • Kim, Kwangjo (IRIS, Information and Communication University (ICU))
  • 발행 : 2003.07.01
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초록

Key exposure is the most devastating attacks in any crytographic scheme. In this paper, we investigate key exposure problem in blind signature. We then present a variant of Okamoto-Guillou-Quisquater (OGQ for short) blind signature scheme guaranteeing forward secrecy. Namely, even if current secret key is revealed, forging any signature valid in the past is impossible. Our proposed scheme exhibits an efficient key updating protocol and introduces no significant communication overhead.

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