Helger Lipmaa's publications

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

Florian Bourse, Fabrice Benhamouda and Helger Lipmaa. CCA-Secure Inner-Product Functional Encryption from Projective Hash Functions. In Serge Fehr, editor, PKC 2017, volume 10175 of Lecture Notes in Computer Science, pages 36--66, Amsterdam, Netherlands, March 28--31, 2017. Springer, Heidelberg.

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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.

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

Comment: Full version is available at http://eprint.iacr.org/2017/038

More information: Publisher Webpage.

DOI: 10.1007/978-3-662-54388-7_2


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