Cryptology ePrint Archive: Report 2016/262

Collaborative Multi-Authority Key-Policy Attribute-Based Encryption for Shorter Keys and Parameters

Riccardo Longo and Chiara Marcolla and Massimiliano Sala

Abstract: Architectures relying on a single central authority often offer a great efficiency, but suffer of resiliency problems and are quite vulnerable to attacks. In our proposal, a Multiple-Authorities Key-Policy Attribute-Based Encryption scheme is constructed including a collaboration phase between the authorities, in order to achieve shorter keys and parameters, thus enhancing the efficiency of encryption and decryption. \\ We prove our system secure under a variation of the bilinear Diffie-Hellman assumption, providing a lower bound on its complexity.

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

Date: received 8 Mar 2016, last revised 11 Dec 2017

Contact author: riccardolongomath at gmail com

Available format(s): PDF | BibTeX Citation

Note: Minor improvements and typos correction.

Version: 20171211:131104 (All versions of this report)

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