Cryptology ePrint Archive: Report 2017/038

CCA-Secure Inner-Product Functional Encryption from Projective Hash Functions

Fabrice Benhamouda and Florian Bourse and Helger Lipmaa

Abstract: In an inner-product functional encryption scheme, the plaintexts are vectors and the owner of the secret key can delegate the ability to compute weighted sums of the coefficients of the plaintext of any ciphertext. Recently, many inner-product functional encryption schemes were proposed. However, none of the known schemes are secure against chosen ciphertext attacks (IND-FE-CCA). We present a generic construction of IND-FE-CCA inner-product functional encryption from projective hash functions with homomorphic properties. We show concrete instantiations based on the DCR assumption, the DDH assumption, and more generally, any Matrix DDH assumption.

Category / Keywords: public-key cryptography / DCR, DDH, inner-product functional encryption, projective hash functions, CCA-security

Original Publication (in the same form): IACR-PKC-2017

Date: received 15 Jan 2017

Contact author: fabrice benhamouda at normalesup org, florian bourse@ens fr, helger lipmaa@gmail com

Available format(s): PDF | BibTeX Citation

Version: 20170115:213238 (All versions of this report)

Short URL: ia.cr/2017/038

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