格上可重新拆分的门限多代理者的代理重加密方案

摘要

在格上利用2个不同的加密方案及拉格朗日插值多项构造了一个可重新拆分的门限多代理者的代理重加密方案,即在密文输入输出面与重加密面的加密方案是不同的,这使噪音的界有更宽的选择范围.另外,门限多代理者不仅保证了重加密密钥的安全性,而且当个别代理不能提供正常服务时,重加密方案仍能正确工作.该方案证明是IND-UniRTPRE-CPA安全的.%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.