资源说明:Group Rekeying deals with the problem about how to efficiently and securely distribute a new group key GK to remaining legitimate users when there are changes in group membership (join/leave). Given a universe U of n users, an exclusive key KS for an arbitrary subset SU is a long-term key shared by all users in U \ S. Hence we can distribute a new group key GK encrypted under KS such that all users in U except those in S can decrypt it during group rekeying. This method allows us to exclude S f
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