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

Riccardo Longo; Chiara Marcolla; Massimiliano Sala

Paper 2016/262

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

Riccardo Longo, 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.

Note: Minor improvements and typos correction.

Metadata

Available format(s): PDF
Publication info: Preprint.
Keywords: public-key cryptography ABE KP-ABE Multi-Authority Bilinear Groups Diffie-Hellman Assumptions.
Contact author(s): riccardolongomath @ gmail com
History: 2017-12-11: revised; 2016-03-08: received; See all versions
Short URL: https://ia.cr/2016/262
License: CC BY

BibTeX

@misc{cryptoeprint:2016/262,
      author = {Riccardo Longo and Chiara Marcolla and Massimiliano Sala},
      title = {Collaborative Multi-Authority Key-Policy Attribute-Based Encryption for Shorter Keys and Parameters},
      howpublished = {Cryptology {ePrint} Archive, Paper 2016/262},
      year = {2016},
      url = {https://eprint.iacr.org/2016/262}
}