Cryptology ePrint Archive: Report 2016/262

Collaborative Multi-Authority KP-ABE for Shorter Keys and Parameters

Riccardo Longo and Chiara Marcolla and Massimiliano Sala

Abstract: Bilinear groups are often used to create Attribute-Based Encryption (ABE) algo- rithms. In our proposal, a Multiple-Authorities Key-Policy Attribute-Based Encryp- tion scheme is constructed in which the authorities collaborate to achieve shorter keys and parameters, enhancing the efficiency of encryption and decryption. We prove our system secure under an original variation of the bilinear Diffie- Hellman assumption, we also show its relation with other similar assumptions.

Category / Keywords: public-key cryptography / ABE, KP-ABE, Multi Authority, Bilinear Groups, Diffie-Hellman Assumptions

Date: received 8 Mar 2016

Contact author: riccardolongomath at gmail com

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Version: 20160308:201258 (All versions of this report)

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