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Group Encryption: Full Dynamicity, Message Filtering and Code-Based Instantiation
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Abstract: | Group encryption (\textsf{GE}), introduced by Kiayias, Tsiounis and Yung (Asiacrypt'07), is the encryption analogue of group signatures. It allows to send verifiably encrypted messages satisfying certain requirements to certified members of a group, while keeping the anonymity of the receivers. Similar to the tracing mechanism in group signatures, the receiver of any ciphertext can be identified by an opening authority - should the needs arise. The primitive of \textsf{GE} is motivated by a number of interesting privacy-preserving applications, including the filtering of encrypted emails sent to certified members of an organization.
This paper aims to improve the state-of-affairs of \textsf{GE} systems. Our first contribution is the formalization of fully dynamic group encryption (\textsf{FDGE}) - a \textsf{GE} system simultaneously supporting dynamic user enrolments and user revocations. The latter functionality for \textsf{GE} has not been considered so far. As a second contribution, we realize the message filtering feature for \textsf{GE} based on a list of |
Video from PKC 2021
BibTeX
@article{pkc-2021-31008, title={Group Encryption: Full Dynamicity, Message Filtering and Code-Based Instantiation}, booktitle={Public-Key Cryptography - PKC 2021}, publisher={Springer}, doi={10.1007/978-3-030-75248-4_24}, author={Khoa Nguyen and Reihaneh Safavi-Naini and Willy Susilo and Huaxiong Wang and Yanhong Xu and Neng Zeng}, year=2021 }