Cryptology ePrint Archive: Report 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).

Category / Keywords: public-key cryptography / attribute-based encryption, fully homomorphic encryption

Date: received 26 Apr 2017

Contact author: Hiromasa Ryo at aj MitsubishiElectric co jp

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Version: 20170501:133644 (All versions of this report)

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