New Proof Techniques for DLIN-Based Adaptively Secure Attribute-Based Encryption

Katsuyuki Takashima

Paper 2015/1021

New Proof Techniques for DLIN-Based Adaptively Secure Attribute-Based Encryption

Katsuyuki Takashima

Abstract

We propose adaptively secure attribute-based encryption (ABE) schemes for boolean formulas over large universe attributes from the decisional linear (DLIN) assumption, which allow attribute reuse in an available formula without the previously employed redundant multiple encoding technique. Thus our KP-(resp. CP-)ABE has non-redundant ciphertexts (resp. secret keys). For achieving the results, we develop a new encoding method for access policy matrix for ABE, by decoupling linear secret sharing (LSS) into its matrix and randomness, and partially randomizing the LSS shares in simulation. The new techniques are of independent interest and we expect it will find another application than ABE.

Metadata

Available format(s): PDF
Publication info: Published elsewhere. Major revision. ACISP 2017, the 22nd Australasian Conference on Information Security and Privacy
Keywords: Attribute-Based Encryption Multi-Use Attributes in Policy Adaptive Security Static Assumption
Contact author(s): Takashima Katsuyuki @ aj mitsubishielectric co jp
History: 2017-04-18: last of 6 revisions; 2015-10-23: received; See all versions
Short URL: https://ia.cr/2015/1021
License: CC BY

BibTeX

@misc{cryptoeprint:2015/1021,
      author = {Katsuyuki Takashima},
      title = {New Proof Techniques for {DLIN}-Based Adaptively Secure Attribute-Based Encryption},
      howpublished = {Cryptology {ePrint} Archive, Paper 2015/1021},
      year = {2015},
      url = {https://eprint.iacr.org/2015/1021}
}