A lattice-based anti-quantum privacy-preserving scheme for smart meter

Real-time transmission of fine-grained power consumption from smart meters to power control center in the smart grid may lead to the leakage of users' privacy. The existing smart meter privacy protection schemes are based on classical cryptography usually, which cannot resist quantum attacks. Aiming at the problem above, a lattice-based privacy protection scheme for smart meters which can resist quantum attacks is proposed. The scheme realizes identity anonymity by assigning anonymous identities for smart meter users, protecting users' privacy. Moreover, taking advantage of the fact that the lattice-based hard problems cannot be solved in quantum computers, the lattice-based encryption and signature are designed in the scheme to resist quantum attacks. Furthermore, batch verification is designed in the scheme to improve the efficiency of verifying signatures, and multiplication and addition are used in matrices and vectors to reduce the scheme's computational overhead. Theoretical analysis and corresponding experiments show that the scheme has higher efficiency while satisfying privacy and security.