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An Identity-based Encryption (IBE) Scheme Can Greatly Reduce The Complexity Of Sending Encrypted Messages. However, An IBE Scheme Necessarily Requires A Private-key Generator (PKG), Which Can Create Private Keys For Clients, And So Can Passively Eavesdrop On All Encrypted Communications. Although A Distributed PKG Has Been Suggested As A Way To Mitigate This Key Escrow Problem For Boneh And Franklin’s IBE Scheme, The Security Of This Distributed Protocol Has Not Been Proven. Further, A Distributed PKG Has Not Been Considered For Any Other IBE Scheme. In This Paper, We Design Distributed PKG Setup And Private Key Extraction Protocols For Three Important IBE Schemes; Namely, Boneh And Franklin’s BF-IBE, Sakai And Kasahara’s SK-IBE, And Boneh And Boyen’s BB1 -IBE. We Give Special Attention To The Applicability Of Our Protocols To All Possible Types Of Bilinear Pairings And Prove Their IND-ID-CCA Security In The Random Oracle Model Against A Byzantine Adversary. Finally, We Also Perform A Comparative Analysis Of These Protocols And Present Recommendations For Their Use.

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