Quantum Key Leasing for PKE and FHE with a Classical Lessor

arXiv:2310.14328v4 Announce Type: replace
Abstract: In this work, we consider the problem of secure key leasing, also known as revocable cryptography (Agarwal et. al. Eurocrypt' 23, Ananth et. al. TCC' 23), as a strengthened security notion of its predecessor put forward in Ananth et. al. Eurocrypt' 21. This problem aims to leverage unclonable nature of quantum information to allow a lessor to lease a quantum key with reusability for evaluating a classical functionality. Later, the lessor can request the lessee …

arxiv cryptography cs.cr eurocrypt fhe forward key notion problem quant-ph quantum security tcc work