The two-volume set constitutes the refereed proceedings of the 5th International Conference on Big Data and Security, ICBDS 2023, held in Nanjing, China, during December 22–24, 2023. 

The 35 full papers and 1 short paper were carefully reviewed and selected from 161 submissions. They are organized in topical sections as follows: 

Part One: Big Data & New Method and Artificial Intelligence & Machine Learning

Part Two: Data Technology & Network Security and IoT Security & Privacy Protection.