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In distribution of data encrypted to multiple users, there is a problem that the system will become low efficient if a single key center has to generate keys for a large number of users. Besides, it is a risk that some users could deliberately disclose their keys for some benefits. We in this paper give a key leakage discovering scheme where users are partitioned into groups and groups are hierarchically organized. In our scheme, users in upper-level groups can delegate keys for users indoi:10.1109/incos.2013.149 dblp:conf/incos/DengQDZWLM13 fatcat:7i2pslzyljgahizubzk2xvcbya