Dr. Yongjun Ren works in School of Computer Science and Technology, Zhejiang Gongshang University, Hangzhou, China as an Associate Professor. He is the Guest Editor of the Special Issues "Novel Methods Applied to Security and Privacy Problems", "Blockchain-Enabled Privacy-Preserving for Internet of Things", and "Blockchain-Based Security System Applied to IoT Used in Intelligent Systems" in MDPI. His research interests mainly focus on network security and applied cryptography. His scientific output includes 135 publications, corresponding to 1855 citations (h-index 20) (Scopus, 12 December 2023).