Lattice-based IBE with Equality Test Supporting Flexible Authorization in the Standard Model
This work addresses privacy protection in encrypted data management for applications like keyword search and health records, but it appears incremental as it builds on existing IBEET concepts with added authorization features.
The paper tackled the problem of enabling equality tests on encrypted data while allowing users to control comparisons, proposing an identity-based encryption with equality test supporting flexible authorization (IBEET-FA) system based on the learning with error (LWE) problem, with security proven in the standard model.
Identity-based encryption with equality test supporting flexible authorization (IBEET-FA) allows the equality test of underlying messages of two ciphertexts while strengthens privacy protection by allowing users (identities) to control the comparison of their ciphertexts with others. IBEET by itself has a wide range of useful applicable domain such as keyword search on encrypted data, database partitioning for efficient encrypted data management, personal health record systems, and spam filtering in encrypted email systems. The flexible authorization will enhance privacy protection of IBEET. In this paper, we propose an efficient construction of IBEET-FA system based on the hardness of learning with error (LWE) problem. Our security proof holds in the standard model.