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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Revealing the linkability of Popescue ID-based Group Signature Scheme

  • Park, Hyungki (International Research center for Information Security(IRIS) Information and Communications Univ.(ICU)) ;
  • Fangguo Zhang (International Research center for Information Security(IRIS) Information and Communications Univ.(ICU)) ;
  • Kim, Kwangjo (International Research center for Information Security(IRIS) Information and Communications Univ.(ICU))
  • Published : 2002.11.01
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Abstract

Group signature schemes allow a group member to sign a document on behalf of the group anonymously. In addition, in case of anonymity misuse, a group authority can recover the issuer of a signature. In this paper, we analyze the security of a group signature scheme proposed by Popescu which is a modification of the Tseng-Jan group signature scheme. We show that the scheme can't provide an important requirement of the group signature, unlikability. Thus, other members are allowed to identify whether two signatures have been issued by the same group member or not.

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