Latest Papers

Efficient Function-Hiding Functional Encryption: From Inner-Products to Orthogonality

Authors: Manuel Barbosa, Dario Catalano, Azam Soleimanian and Bogdan Warinschi 


We construct functional encryption (FE) schemes for the orthogonality (OFE) relation where each ciphertext encrypts some vector x and each decryption key, associated to some vector y, allows to determineif x isorthogonalto y ornot. Motivated by compelling applications, we aim at schemes which are function hidding, i.e. y is not leaked.

Paper: Unbounded ABE via Bilinear Entropy Expansion, Revisted

Authors: Jie Chen, Junqing Gong, Lucas Kowalczyk and Hoeteck Wee


We present simpler and improved constructions of unbounded attribute-based encryption (ABE) schemes with constant-size public parameters under static assumptions in bilinear groups. Concretely, we obtain:

    – a simple and adaptively secure unbounded ABE scheme in composite-order groups, improving upon a previous construction of Lewko andWaters (Eurocrypt ’11) which only achieves selective security;

Paper: Multi-Input Functional Encryption for Inner Products: Function-Hiding Realizations and Constructions without Pairings

Authors: Michel Abdalla, Dario Catalano, Dario Fiore, Romain Gay and Bodgan Ursu


We present new constructions of multi-input functional encryption (MIFE) schemes for the inner-product functionality that improve the state of the art solution of Abdalla et al. (Eurocrypt 2017) in two main directions.