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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