Fully Dynamic Multi Target Homomorphic Attribute-Based Encryption

Ryo Hiromasa; Yutaka Kawai

Paper 2017/373

Fully Dynamic Multi Target Homomorphic Attribute-Based Encryption

Ryo Hiromasa and Yutaka Kawai

Abstract

We propose multi target homomorphic attribute-based encryption (MT-HABE) with fully dynamic homomorphic evaluation: it can take as input arbitrary additional ciphertexts during homomorphic computation. In the previous MT-HABE of Brakerski et al. (TCC 2016-B), the output of homomorphic computation, which is related to a policy set, cannot be computed with a fresh ciphertext whose attribute does not satisfy any policy in the set. This is because the underlying multi-key fully homomorphic encryption (MKFHE) is single-hop: some keys are related to the output of homomorphic computation, which cannot be combined with ciphertexts encrypted under other keys. To implement fully dynamic homomorphic evaluations, we construct MT-HABE from the multi-hop MKFHE proposed by Peikert and Shiehian (TCC 2016-B).

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Preprint. MINOR revision.
Keywords: attribute-based encryption fully homomorphic encryption
Contact author(s): Hiromasa Ryo @ aj mitsubishielectric co jp
History: 2017-05-01: received
Short URL: https://ia.cr/2017/373
License: CC BY

BibTeX

@misc{cryptoeprint:2017/373,
      author = {Ryo Hiromasa and Yutaka Kawai},
      title = {Fully Dynamic Multi Target Homomorphic Attribute-Based Encryption},
      howpublished = {Cryptology {ePrint} Archive, Paper 2017/373},
      year = {2017},
      url = {https://eprint.iacr.org/2017/373}
}