Identity-based proxy re-encryption scheme from RLWE assumption with ciphertext evolution  

作　　者：Meng Hui Ren Lina Zhao Zongqu 

机构地区：[1]College of Software,Henan Polytechnic University,Jiaozuo 454000,China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2023年第5期51-60,共10页中国邮电高校学报（英文版）

基　　金：supported by the Henan Key Laboratory of Network Cryptography Technology(LNCT2022-A11);the Shaanxi Key Laboratory of Information Communication Network and Security(ICNS202006)。

摘　　要：Proxy re-encryption(PRE)allows users to transfer decryption rights to the data requester via proxy.Due to the current PRE schemes from lattice(LPRE)cannot fulfill chosen-ciphertext attack(CCA)security,an identity-based PRE(IB-PRE)scheme from learning with errors over ring(RLWE)assumption with ciphertext evolution(IB-LPRE-CE)was proposed.IB-LPRE-CE generates the private key using the preimage sampling algorithm(SamplePre)and completes the ciphertext delegation using the re-encryption algorithm.In addition,for the problem of ciphertext delegation change caused by the long-term secret key update,the idea of PRE is used to complete ciphertext evolution and the modification of ciphertext delegation,which improves the efficiency of secure data sharing.In terms of security,IB-LPRE-CE is CCA security based on RLWE assumption.Compared with the current LPRE schemes,IB-LPRE-CE offers greater security and improves the computational efficiency of the encryption algorithm.

关 键 词：proxy re-encryption(PRE) learning with errors over ring(RLWE) chosen-ciphertext attack(CCA) ciphertext delegation ciphertext evolution 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]