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Table 4 Comparison of computation and communication cost

From: Comprehensive evaluation of key management hierarchies for outsourced data

Hierarchy type Cost of a grant read access Cost of a revoke read access Modification of hierarchy due to user revocation
Minimal vertex UH \(1\mathcal {E} + 1\mathcal {D} + 2\mathcal {C}\) \(|R|(1\mathcal {E} + 1\mathcal {D}) + 2\mathcal {C}\) Yes
Minimal vertex RH \(\:\:\:\:\:\:\:\:1\mathcal {C}\:\:\:\:\:\:\:\:\) \(|R|(1\mathcal {E} + 1\mathcal {D}) + 2\mathcal {C}\) No