Collusion-Resistant Group Key Management Using Attribute-Based Encryption.
Ling Cheung, Joseph A. Cooley, Roger I. Khazan, Calvin C. Newport · IACR Cryptology ePrint Archive · 2007
This paper illustrates the use of ciphertext-policy attribute- based encryption (CP-ABE), a recently proposed primitive, in the set- ting of group key management. Specifically, we use the CP-ABE scheme of Bethencourt, Sahai and Waters to implement flat table group key management. Unlike past implementations of flat table, our proposal is resistant to collusion attacks. We also provide ecient mechanisms to refresh user secret keys (for perfect forward secrecy) and to delegate managerial duties to subgroup controllers (for scalability). Finally, we discuss performance issues and directions for future research.