Method of tracing device keys for broadcast encryption

摘要

How to effectively track the device key in the user management system that uses the HBES key algorithms, the device key user key management system, and a recording medium that can read the tracking method of the device key to a computer in which a program for executing on a computer are disclosed for performing the tracking method. To keep track of the illegal device key from the user key management system decoder for a broadcast encryption, according to the present invention comprises the step of disposing of the step, and the tracking device for tracking the device key using a binary search key, It characterized. The invention can be utilized as a post-exposure protection technology for the device key through hacking or the like. The present invention provides a tracking (tracing) a method that may be incorporated into the HBES algorithm structure.