Distributed Timestamp Mechanism Based on Verifiable Delay Functions  

作　　者：Qiang Wu Zhaoyang Han Ghulam Mohiuddin Yongjun Ren 

机构地区：[1]Engineering Research Center of Digital Forensics of Ministry of Education,School of Computer Science,Nanjing University of Information Science and Technology,Nanjing,210044,China [2]Nanjing University of Aeronautics and Astronautics,Nanjing,210008,China [3]Department of Cyber Security at VaporVM,Abu Dhabi,999041,United Arab Emirates

出　　处：《Computer Systems Science & Engineering》2023年第2期1633-1646,共14页计算机系统科学与工程（英文）

基　　金：supported by National Key R&D Program of China(Grant Nos.2021YF B2700503,2020YF B1005900);supported by the National Natural Science Foundation of China(No.62072249)。

摘　　要：In the data communication system,the real-time information interaction of communication device increases the risk of privacy sensitive data being tam-pered with.Therefore,maintaining data security is one of the most important issues in network data communication.Because the timestamp is the most impor-tant way to authenticate data in information interaction,it is very necessary to pro-vide timestamp service in the data communication system.However,the existing centralized timestamp mechanism is difficult to provide credible timestamp ser-vice,and users can conspire with timestamping servers to forge timestamps.Therefore,this paper designs a distributed timestamp mechanism based on contin-uous verifiable delay functions.It utilizes multiple independent timestamp servers to provide timestamp services in a distributed model and appends the timestamp to the data once the data is generated.Thus,it can prove that the data already exists at a certain time and ensure the accuracy of the timestamp.Moreover,a digital blind signature based on elliptic curve cryptography is utilized to solve the problem of timestamp forgery in timestamp service.Finally,the security ana-lysis of the scheme ensures the data security of data communication system and the concurrency rate of timestamp.The experimental results also show that the scheme greatly improves the efficiency of digital signatures.

关 键 词：TIMESTAMP verifiable delay functions blockchain 

分 类 号：O174[理学—数学]