ANONIZE: a large-scale anonymous survey system. A secure ad-hoc survey scheme enables a survey authority to independently (with- out any interaction) select an ad-hoc group of registered users based only on their identities (e.g., their email addresses), and create a survey where only selected users can anonymously submit exactly one response. We present a formalization of secure ad-hoc surveys and present: an abstract provably-secure implementation based on standard cryptographic building blocks (which in particular are implied by the existence of enhanced trapdoor permutations in the CRS model); apracticalinstantiationofourabstractprotocol,calledanonize,whichisprovably- secure in the random oracle model based on cryptographic assumptions on groups with bilinear maps. As far as we know, anonize constitutes the first implementation of a large-scale secure computation protocol (of non-trivial functionalities) that can scale to millions of users.

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  1. Libert, BenoƮt; Ling, San; Nguyen, Khoa; Wang, Huaxiong: Zero-knowledge arguments for lattice-based PRFs and applications to E-cash (2017)