Weighted Attribute Based Conditional Proxy Re-Encryption in the Cloud  

作　　者：Xixi Yan Jing Zhang Pengyu Cheng 

机构地区：[1]Henan Key Laboratory of Network Cryptography Technology,Network Information Security and Cryptography Laboratory,School of Software,Henan Polytechnic University,Jiaozuo,454003,China [2]School of Computer Science and Technology,Henan Polytechnic University,Jiaozuo,454000,China

出　　处：《Computers, Materials & Continua》2025年第4期1399-1414,共16页计算机、材料和连续体(英文)

基　　金：Programs for Science and Technology Development of Henan Province,grant number 242102210152;The Fundamental Research Funds for the Universities of Henan Province,grant number NSFRF240620;Key Scientific Research Project of Henan Higher Education Institutions,grant number 24A520015;Henan Key Laboratory of Network Cryptography Technology,grant number LNCT2022-A11.

摘　　要：Conditional proxy re-encryption(CPRE)is an effective cryptographic primitive language that enhances the access control mechanism and makes the delegation of decryption permissions more granular,but most of the attribute-based conditional proxy re-encryption(AB-CPRE)schemes proposed so far do not take into account the importance of user attributes.A weighted attribute-based conditional proxy re-encryption(WAB-CPRE)scheme is thus designed to provide more precise decryption rights delegation.By introducing the concept of weight attributes,the quantity of system attributes managed by the server is reduced greatly.At the same time,a weighted tree structure is constructed to simplify the expression of access structure effectively.With conditional proxy re-encryption,large amounts of data and complex computations are outsourced to cloud servers,so the data owner(DO)can revoke the user’s decryption rights directly with minimal costs.The scheme proposed achieves security against chosen plaintext attacks(CPA).Experimental simulation results demonstrated that the decryption time is within 6–9 ms,and it has a significant reduction in communication and computation cost on the user side with better functionality compared to other related schemes,which enables users to access cloud data on devices with limited resources.

关 键 词：Cloud service conditional proxy re-encryption user revocation weighted attribute 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]