The two-volume set IFIP AICT 745 + 746 constitutes the refereed proceedings of the 40th IFIP International Conference on ICT Systems Security and Privacy Protection, SEC 2025, held in Maribor, Slovenia, during May 21-23, 2025.

.- Privacy protection.

.- Advanced strategies for privacy preserving data publishing to improve multi class classification.

.- COLIBRI: Optimizing Multi Party Secure Neural Network Inference Time for Transformers.

.- SAAFL: Secure Aggregation for Label Aware Federated Learning.

.- “We’ve met some problems”: Developers’ Issues With Privacy Preserving Computation Techniques on Stack Overflow.

.- Facing the Challenge of Leveraging Untrained Humans in Malware Analysis.

.- Post Processing in Local Differential Privacy: An Extensive Evaluation and Benchmark Platform.

.- Rubber Ducky Station: Advancing HID Attacks with Visual Data Exfiltration.

.- PrivTru: A Privacy by Design Data Trustee Minimizing Information Leakage.

.- Industrial and Critical Infrastructure Security.

.- Uncovering Robot Joint Level Controller Actions from Encrypted Network Traffic.

.- Artefact Provenance Graphs for Anomaly Inference in Industrial Control Systems.

.- Certified Secure Updates for IoT Devices.

.- LSAST: Enhancing Cybersecurity through LLM supported Static Application Security Testing.

.- FRAMICS: Functional Risk Assessment Methodology for Industrial Control Systems.

.- Data Transformation for IDS: Leveraging Symbolic and Temporal Aspects.

.- SAFARI: a Scalable Air gapped Framework for Automated Ransomware Investigation.

.- SAVA Deployment for Spoofed Source Attacks.

.- Lightweight and Persistent Remote Attestation: Leveraging a Continuous Chain of Trust in Software Integrity Measurements.