Sharing of Encrypted Lock Keys in the Blockchain-Based Renting House System from Time- and Identity-Based Proxy Reencryption  

作　　者：Zhiwei Wang Liping Qian Danwei Chen Guozi sun 

机构地区：[1]School of Computer,Nanjing University of Posts and Telecommunications,Nanjing 210023,China [2]Jiangsu Key Laboratory of Big Data Security and Intelligent Processing,Nanjing 210023,China [3]Guangxi Key Laboratory of Cryptography and Information Security,Department of Computer Sciences,Guilin University of Electronic Technology,Guilin 541004,China

出　　处：《China Communications》2022年第5期164-177,共14页中国通信（英文版）

基　　金：This research is partially supported by the National Natural Science Foundation of China under Grant Nos.61672016;the Jiangsu Qing Lan Project,the Six Talent Peaks Project in Jiangsu Province under Grant RJFW-010;the Guangxi Key Laboratory of Cryptography and Information Security under Grant GCIS201815.

摘　　要：To design an efficient protocol for sharing the encrypted lock keys in the renting house system,we introduce a new notion called time-and identitybased proxy reencryption(TIPRE)and the blockchain platform.Our CPA secure TIPRE scheme is constructed from Green et al.’s identity-based proxy reencryption scheme by adding the time property.In every time period,a time stamp authority generates a public key embedded with the current time stamp for each user.In our protocol for the renting house system,the TIPRE scheme is the primary building block,and the blockchain platform serves instead of a trusted third party,such as a real estate agency between landlords and tenants.The TIPRE scheme allows the landlord to change the lock key at each time period for safety.The blockchain platform allows the landlords and tenants to directly interact,and all of the interactions are recorded in the blockchain database to provide the desired security requirements,such as nonrepudiation and unforgeability.Finally,we provide the secure analysis of our protocol and test its performance by implementing it in the MacBook Pro and the Intel Edison development platforms.

关 键 词：identity-based proxy reencryption time stamp renting houses system blockchain 

分 类 号：TN918.4[电子电信—通信与信息系统]