Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

Server-aided revocable attribute-based encryption

Cui, H.ORCID: 0000-0002-5820-2233, Deng, R.H., Li, Y. and Qin, B. (2016) Server-aided revocable attribute-based encryption. In: Askoxylakis, I., Ioannidis, S., Katsikas, S. and Meadows, C., (eds.) Computer Security – ESORICS 2016. Springer, pp. 570-587.

Link to Published Version: https://doi.org/10.1007/978-3-319-45741-3_29
*Subscription may be required

Abstract

As a one-to-many public key encryption system, attribute-based encryption (ABE) enables scalable access control over encrypted data in cloud storage services. However, efficient user revocation has been a very challenging problem in ABE. To address this issue, Boldyreva, Goyal and Kumar [5] introduced a revocation method by combining the binary tree data structure with fuzzy identity-based encryption, in which a key generation center (KGC) periodically broadcasts key update information to all data users over a public channel. The Boldyreva-Goyal-Kumar approach reduces the size of key updates from linear to logarithm in the number of users, and it has been widely used in subsequent revocable ABE systems; however, it requires each data user to keep a private key of logarithmic size and all non-revoked data users to periodically update decryption keys for each new time period. To further optimize user revocation in ABE, in this paper, we propose a notion called server-aided revocable ABE (SR-ABE), in which almost all workloads of data users incurred by user revocation are delegated to an untrusted server and each data user only needs to store a key of constant size. We then define a security model for SR-ABE, and present a concrete SR-ABE scheme secure under this model. Interestingly, due to the key embedding gadget employed in the construction of SR-ABE, our SR-ABE scheme does not require any secure channels for key transmission, and also enjoys an additional property in the decryption phase, where a data user only needs to perform one exponentiation computation to decrypt a ciphertext.

Item Type: Book Chapter
Publisher: Springer
Copyright: © 2016 Springer International Publishing Switzerland
URI: http://researchrepository.murdoch.edu.au/id/eprint/44051
Item Control Page Item Control Page