Title: Efficient revocable identity-based encryption with equality test

Authors: Jiaojiao Du; Sha Ma; Tian Yang; Qiong Huang

Addresses: College of Mathematics and Informatics, South China Agricultural University, Guangzhou, Guangdong, China ' College of Mathematics and Informatics, South China Agricultural University, Guangzhou, Guangdong, China ' College of Mathematics and Informatics, South China Agricultural University, Guangzhou, Guangdong, China ' College of Mathematics and Informatics, South China Agricultural University, Guangzhou, Guangdong, China

Abstract: Identity-based encryption with equality test (IBEET) provides an attractive method to test whether two ciphertexts are encryptions of the same plaintext without certificate managements. However, none of the existing IBEET constructions can provide a way to revoke the user in the scenario where the user's private key is compromised or identity gets expired, which is undesirable for identity-based setting. Furthermore, the user cannot revoke the tester when it no longer wants the tester to test its ciphertexts. How to achieve both user and tester revocation in IBEET remains a challenging task. In this paper, we propose a new primitive called revocable identity-based encryption with equality test (R-IBEET), which can solve the aforementioned two problems simultaneously, and formalise the security models of R-IBEET against three types of adversaries. Then we propose a concrete construction of R-IBEET. Our scheme is pairing-free, thus is more efficient compared with the related work.

Keywords: cloud computing; identity-based encryption; equality test; revocation.

DOI: 10.1504/IJACT.2024.138425

International Journal of Applied Cryptography, 2024 Vol.4 No.3/4, pp.205 - 218

Received: 01 Dec 2022
Accepted: 10 Jun 2023
Published online: 03 May 2024 *

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