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

作     者：Meng Hui Ren Lina Zhao Zongqu Meng Hui;Ren Lina;Zhao Zongqu

作者机构：College of SoftwareHenan Polytechnic UniversityJiaozuo 454000China 

出 版 物：《The Journal of China Universities of Posts and Telecommunications》 (中国邮电高校学报(英文版))

年 卷 期：2023年第30卷第5期

页      面：51-60页

核心收录：

学科分类：08[工学] 081201[工学-计算机系统结构] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

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)。 

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

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.