METHOD OF TRACING DEVICE KEYS FOR A BROADCAST ENCRYPTION, CAPABLE OF TRACING A DEVICE KEY IN A USER KEY MANAGEMENT SYSTEM TO A BROADCAST ENCRYPTION

摘要

PURPOSE: A method of tracing device keys for a broadcast encryption is provided to prevent exposure of a device key through hacking.;CONSTITUTION: Entire section is inputted as an interval(a,b) of a device number(100). It is determined whether 'a' is 'b-1'(110). In case 'a' is 'b-1', TCT is calculated(120). In case the TCT is '1' and an illegal decoder can reproduce the test cryptogram, 'a' is outputted as a tracing result(140). In case for TCT is '0' and the illegal decoder can't reproduce the test cryptogram, 'b' is outputted as a tracing result(150).;COPYRIGHT KIPO 2010