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2016 | OriginalPaper | Buchkapitel

Adaptively Secure Unrestricted Attribute-Based Encryption with Subset Difference Revocation in Bilinear Groups of Prime Order

verfasst von : Pratish Datta, Ratna Dutta, Sourav Mukhopadhyay

Erschienen in: Progress in Cryptology – AFRICACRYPT 2016

Verlag: Springer International Publishing

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Abstract

Providing an efficient revocation mechanism for attribute-based encryption (ABE) is of utmost importance since over time a user’s credentials may be revealed or expired. All previously known revocable ABE (RABE) constructions (a) essentially utilize the complete subtree (CS) scheme for revocation purpose, (b) are restricted in the sense that the size of the public parameters depends linearly on the size of the attribute universe and logarithmically on the number of users in the system, and (c) are either selectively secure, which seems unrealistic in a dynamic system such as RABE, or fully secure but built in a composite order bilinear group setting, which results in high computational cost. This paper presents the first adaptively secure unrestricted RABE using subset difference (SD) mechanism for revocation which greatly improves the broadcast efficiency compared to the CS scheme. Our RABE scheme is built on a prime order bilinear group setting resulting in practical computation cost, and its security depends on the Decisional Linear assumption.

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Vorheriges Kapitel Attribute-Based Fully Homomorphic Encryption with a Bounded Number of Inputs

Nächstes Kapitel Weak Keys for the Quasi-Cyclic MDPC Public Key Encryption Scheme

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Titel: Adaptively Secure Unrestricted Attribute-Based Encryption with Subset Difference Revocation in Bilinear Groups of Prime Order
verfasst von: Pratish Datta
Ratna Dutta
Sourav Mukhopadhyay
Verlag: Springer International Publishing
Buch: Progress in Cryptology – AFRICACRYPT 2016
Print ISBN: 978-3-319-31516-4

Electronic ISBN: 978-3-319-31517-1

Copyright-Jahr: 2016
DOI: https://doi.org/10.1007/978-3-319-31517-1_17

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