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 with short public parameters.

Category / Keywords: Cryptographic Protocols, Attribute Based Encryption

Date: received 27 Sep 2014, last revised 1 Jun 2016

Contact author: luke at cs columbia edu

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Note: Prime-order construction in previous versions was broken, and has been removed.

Version: 20160601:115307 (All versions of this report)

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