Electronic signature method based on identity information of group members and method for acquiring identity information of signed-group member and electronic signature system for performing electronic signature based on identity information of group members

摘要

The method for performing an electronic signature using a public key encryption method, based on the identity of one or more group members that are included in the same group are provided. Digital signature method according to the present invention includes the step generating a group parameter, a member registration step, the digital signature stage and the verification step, a member registration step, the identity information and the identity of the group member in the group applying a predetermined hash function, identity using the information digest value, and transmits the information to the members of the secret key generation member secret key information and the creation of group members to members of the group. Can securely manage an electronic signature from the attack, such as counterfeiting and conspiracy by the present invention, it is possible to separate the functions of the group administrator.