INFINITE HIERARCHICAL IDENTITY-BASED SIGNATURE METHOD WITH REVOCATION FUNCTION

摘要

According to an embodiment of the present invention, an infinite hierarchical identity (ID)-based signature method having a revocation function, which is a hierarchical ID-based signature method comprising a server and a plurality of terminals, comprises: a step in which the server receives a security constant using a setup algorithm and generates a revocation list, state information, a public constant, and a master key; a step in which the server receives an ID of a first terminal among lower-level terminals of the server among the plurality of terminals and generates a private key of the first terminal, and transmits the generated private key to the first terminal; a step in which the server generates an update key using the revocation list, the time information and the master key; a step in which the first terminal generates a signature key using the update key and the private key received from the server; and a step in which the first terminal generates a signature through a signature algorithm using a message, the signature key, the time information and the public constant. The present invention can issue keys for an infinite hierarchy and efficiently discard a users key by providing an update function according to time.;COPYRIGHT KIPO 2017