Group signature system and method providing controllable linkability
A group signature system includes: a key issuer server for generating a first parameter of a group public key, generating a corresponding master issuing key, and issuing a signature key to a user when a user device joins; an opener server for generating a second parameter of the group public key, and a corresponding master opening key and master linking key; and a linker server for checking whether two valid signatures have been linked by using the master linking key when the two signatures corresponding to a group public key are given. The group signature system further includes: a signature verifying unit for confirming a validity of the given signatures and a signer information confirming unit for confirming a validity of singer confirming information generated by the opener server.
Electronics and Telecommunications Research Institute
H
H04L
inventional
Sang-Woo Jung Yeon Byung Ho Sokjoon Hyun Sook Gun Tae Sin Hyo Hyeran Yun-Kyung
Lee Hwang Chung Lee Cho Bae Kim Mun Lee