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Decentralized Dynamic Broadcast Encryption

Duong Hieu Phan 1 David Pointcheval 2 Mario Strefler 2 
2 CASCADE - Construction and Analysis of Systems for Confidentiality and Authenticity of Data and Entities
DI-ENS - Département d'informatique - ENS Paris, Inria Paris-Rocquencourt, CNRS - Centre National de la Recherche Scientifique : UMR 8548
Abstract : A broadcast encryption system generally involves three kinds of entities: the group manager that deals with the membership, the encryptor that encrypts the data to the registered users according to a specific policy (the target set), and the users that decrypt the data if they are authorized by the policy. Public-key broadcast encryption can be seen as removing this special role of encryptor, by allowing anybody to send encrypted data. In this paper, we go a step further in the decentralization process, by removing the group manager: the initial setup of the group, as well as the addition of further members to the system, do not require any central authority. Our construction makes black-box use of well-known primitives and can be considered as an extension to the subset-cover framework. It allows for efficient concrete instantiations, with parameter sizes that match those of the subset-cover constructions, while at the same time achieving the highest security level in the standard model under the DDH assumption.
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Submitted on : Thursday, December 13, 2012 - 2:38:22 PM
Last modification on : Thursday, March 17, 2022 - 10:08:36 AM

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Duong Hieu Phan, David Pointcheval, Mario Strefler. Decentralized Dynamic Broadcast Encryption. SCN 2012 - 8th International Conference Security and Cryptography for Networks, Sep 2012, Amalfi, Italy. pp.166-183, ⟨10.1007/978-3-642-32928-9_10⟩. ⟨hal-00764847⟩



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