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To overcome the shortages of hierarchical structure in group key managements, CKDS uses a matrix-like key distribution structure in which the unknown secrets to the revoked nodes are used to distribute the new keys. Exclusion Basis System (EBS) provides a framework for scalable and efficient group key management in which the number of keys stored at users and the number of re-key messages can be relatively adjusted. However, EBS-based solutions may suffer from collusion attacks - a number of nodes may collaborate to reveal all system keys and consequently capture the network. Though proposing EBS-based group key managements solution for collusion resistance don't consider the collusion among active nodes currently in session.
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