An Anonymous Trace-and-Revoke Broadcast Encryption Scheme - Inria - Institut national de recherche en sciences et technologies du numérique Access content directly
Conference Papers Year : 2021

An Anonymous Trace-and-Revoke Broadcast Encryption Scheme

Abstract

Broadcast Encryption is a fundamental cryptographic primitive, that gives the ability to send a secure message to any chosen target set among registered users. In this work, we investigate broadcast encryption with anonymous revocation, in which ciphertexts do not reveal any information on which users have been revoked. We provide a scheme whose ciphertext size grows linearly with the number of revoked users. Moreover, our system also achieves traceability in the black-box confirmation model. Technically, our contribution is threefold. First, we develop a generic transformation of linear functional encryption toward trace-and-revoke systems. It is inspired from the transformation by Agrawal et al. (CCS’17) with the novelty of achieving anonymity. Our second contribution is to instantiate the underlying linear functional encryptions from standard assumptions. We propose a DDH-based construction which does no longer require discrete logarithm evaluation during the decryption and thus significantly improves the performance compared to the DDH-based construction of Agrawal et al.. In the LWE-based setting, we tried to instantiate our construction by relying on the scheme from Wang et al. (PKC’19) but finally found an attack to this scheme. Our third contribution is to extend the 1-bit encryption from the generic transformation to n-bit encryption. By introducing matrix multiplication functional encryption, which essentially performs a fixed number of parallel calls on functional encryptions with the same randomness, we can prove the security of the final scheme with a tight reduction that does not depend on n, in contrast to employing the hybrid argument.
No file

Dates and versions

hal-03475739 , version 1 (11-12-2021)

Identifiers

Cite

Olivier Blazy, Sayantan Mukherjee, Huyen Nguyen, Duong Hieu Phan, Damien Stehlé. An Anonymous Trace-and-Revoke Broadcast Encryption Scheme. ACISP 2021 - Australasian Conference on Information Security and Privacy, Dec 2021, Perth, Australia. pp.214-233, ⟨10.1007/978-3-030-90567-5_11⟩. ⟨hal-03475739⟩
100 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More