Efficient Collusion-Resistant Group Key Management Using CipherText-Policy Attribute-Based Encryption
Date Issued
2009
Date
2009
Author(s)
Lai, Chien-Shen
Abstract
In this thesis, we propose an efficient collusion resistant group key management scheme using ciphertext-policy attribute-based encryption. We modify the CP-ABE scheme of Bethencourt, Sahai and Waters to get more efficiency. Because of the Flat table (FT) scheme achieves high efficiency in terms of storage, computation and communication overheads, we use the idea of the flat table scheme to construct our key management scheme. Unlike past implementations of flat table, the proposed scheme is collusion-resistant. Our scheme outperform Cheung et al. in efficiency because the number of pairing operations in our scheme is O(1) and it is O(N) in Cheung et al.’s scheme where N denotes the size of attribute set in access structure.
Subjects
collusion-resistant
attribute-based encryption
group key management
ciphertext-policy
flat table key management
Type
thesis
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