This book constitutes the refereed proceedings of the Third International Conference on Security and Privacy, ICSP 2024, held in Jamshedpur, India, during November 20–21, 2024. The 12 full papers and 1 short paper included in this book were carefully reviewed and selected from 39 submissions. They were organized in topical sections as follows: Cryptanalysis and Other Attacks; Boolean Functions; Authentication and authorization, Cyber-physical systems security, Privacy-preserving technologies; Blockchain and Cryptocurrency, IoT security and privacy, Database security; Quantum Cryptography.