New Traceable and Revocable Attribute Based Encryption on Lattices
Lifeng Guo, Lingxia Wang, Xueke Ma, Xialei Zhang · 2023
This scheme proposes a new traceable and revocable attribute-based encryption scheme on the lattice (LTR-ABE). First, the attribute-based encryption scheme is more suitable for today's distributed networks and can provide flexible access control. The access control policy used in this paper is the access tree structure, which is applied to the ciphertext policy attribute-based encryption. Second, when a user leaves the system or the key is compromised, the user needs to be revoked from the system. Therefore, the user is tracked to determine whether it is a malicious user and then revoked. More importantly, our proposed revocation mechanism does not need to update the key to achieve revocation. The algorithm is run by an honest and trusted data service manager (DSM) in a cloud server. With the development of quantum computers, the traditional cryptographic mechanism based on bilinear pairs cannot resist quantum attacks. Therefore, our cryptographic scheme is proposed based on lattice theory, specifically the Learning with Error (LWE) problem in lattice, which is resistant to quantum computer attacks. Thus, a new revocation mechanism is implemented in the study of postquantum cryptography.