Cryptology ePrint Archive: Report 2014/754

Bilinear Entropy Expansion from the Decisional Linear Assumption

Lucas Kowalczyk and Allison Bishop Lewko

Abstract: We develop a technique inspired by pseudorandom functions that allows us to increase the entropy available for proving the security of dual system encryption schemes under the Decisional Linear Assumption. We show an application of the tool to Attribute-Based Encryption by presenting a Key-Policy ABE scheme that is fully-secure under DLIN which exhibits an exponential improvement over the state of the art schemes in terms of public parameter size.

Category / Keywords: Cryptographic Protocols, Attribute Based Encryption, Decisional Linear Assumption

Date: received 27 Sep 2014, last revised 4 Sep 2015

Contact author: luke at cs columbia edu

Available format(s): PDF | BibTeX Citation

Note: IMPORTANT NOTE: The current version has a bug in the construction and the security proof of the prime order version. We thank an anonymous reviewer for bringing this to our attention, and we are working on a revised version to fix this.

Version: 20150904:195004 (All versions of this report)

Short URL: ia.cr/2014/754

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