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

Korea Institute of Information Security and Cryptology (한국정보보호학회)
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Analysis on Popscu's Group Signature Scheme for Large Groups

  • Park, Hyungki (International Research Center for Information Security) ;
  • Kim, Kwangjo (Information and Communication Univ (ICU))
  • Published : 2003.07.01
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Abstract

At SIC 2001, Popescu proposed m efficient group signature scheme for large groups［1］. However, this paper shows that his scheme is to be insecure by presenting a signature forgery. Using our attack, anyone (not necessarily a group member) can forge a signature on a message m, and sine the attacker doesn't have to be the group member, the revocation manager cannot reveal the identity of the signer. Additionally, we modify Popescue's scheme to prevent the forgeary.

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