Decentralized Dynamic Broadcast Encryption

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Provided by: Springer Healthcare
Topic: Security
Format: PDF
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, the authors 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, does not require any central authority.
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