This volume constitutes the proceedings of 9th International Symposium on Cyber Security, Cryptology, and Machine Learning, CSCML 2025, in Be'er Sheva, Israel, during December 4–5, 2025.The 17 regular papers and 9 short papers presented here were carefully reviewed and selected from 43 submissions. These papers focus on Cyber security design; secure software development methodologies; formal methods, semantics, and verification of secure systems; fault tolerance, reliability, and availability of distributed secure systems; game-theoretic approaches to secure computing; automatic recovery,self-stabilizing, and self-organizing systems; communication, authentication, and identification security; cyber security for mobile systems and the Internet of Things; and much more.
