Welcome to the resource topic for 2019/250
Title:
Function-Dependent Commitments from Homomorphic Authenticators
Authors: Lucas Schabhüser, Denis Butin, Johannes Buchmann
Abstract:In cloud computing, delegated computing raises the security issue of guaranteeing data authenticity during a remote computation. In this context, the recently introduced function-dependent commitments (FDCs) are the only approach providing both fast correctness verification, information-theoretic input-output privacy, and strong unforgeability. Homomorphic authenticators— the established approach to this problem —do not provide information-theoretic privacy and always reveal the computation’s result upon verification, thus violating output privacy. Since many homomorphic authenticator schemes already exist, we investigate the relation between them and FDCs to clarify how existing schemes can be supplemented with information-theoretic output privacy. Specifically, we present a generic transformation turning any structure-preserving homomorphic authenticator scheme into an FDC scheme. This facilitates the design of multi-party computation schemes with full information-theoretic privacy. We also introduce a new structure-preserving, linearly homomorphic authenticator scheme suitable for our transformation. It is the first both context hiding and structure-preserving homomorphic authenticator scheme. Our scheme is also the first structure-preserving homomorphic authenticator scheme to achieve efficient verification.
ePrint: https://eprint.iacr.org/2019/250
See all topics related to this paper.
Feel free to post resources that are related to this paper below.
Example resources include: implementations, explanation materials, talks, slides, links to previous discussions on other websites.
For more information, see the rules for Resource Topics .