Resplittable threshold multi-broker proxy re-encryption scheme from lattices

Abstract

Two different encryption schemes and Lagrange polynomial were used to construct a resplittable threshold multi-broker proxy re-encryption scheme on the lattice,namely the encryption in the ciphertext input and output side was different from the encryption in the re-encryption side which make the bound of noise was more relaxed.Threshold multi proxy not only ensure the safety of re-encryption key,but also ensure re-encryption scheme can still work even if the individual proxy could not provide normal services.The scheme is proven IND-UniRTPRE-CPA secure.

Keywords

• proxy re-encryption;threshold multi-proxy;learning with error;IND-UniRTPRE-CPA secure