This two-volume set, CCIS 2315 and CCIS 2316, constitutes the refereed proceedings of the 7th International Conference on Frontiers in Cyber Security, FCS 2024 held in Chongqing, China, during July 26-28, 2024. The 47 full papers presented in these two volumes were carefully reviewed and selected from 121 submissions. The papers are organized in the following topical sections: Part I: Machine Learning and Differential Privacy; Federated Learning; Privacy-Preserving Services; Blockchain and Distributed System; Public-Key Cryptography; Multi-Party Computation. Part II: Multi-Party Computation; Smart Grid; Authentication and Deduplication.