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Digital signature method based on identification information of group members, and method of acquiring identification information of signed-group member, and digital signature system for performing digital signature based on identification information of group members
Digital signature method based on identification information of group members, and method of acquiring identification information of signed-group member, and digital signature system for performing digital signature based on identification information of group members
A digital signature method based on identification information of one or more group members who belong to a group includes: a) a group parameter generating operation generating group public key information and group secret key information corresponding to the group; b) a member registering operation generating member secret key information using identification information of the group members who belong to the group and an identification information digest value obtained by applying a predetermined hash function to the identification information, and transmitting the member secret key information to the group members; c) a digital signing operation generating a digital signature by applying a predetermined signature algorithm to the identification information and the identification information digest value, and transmitting the generated digital signature and a message; and d) an authentication operation verifying a validity of the digital signature by applying a predetermined authentication algorithm to the message and the digital signature.
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