This book constitutes the refereed proceedings of the 17th EAI International Conference on Digital Forensics and Cyber Crime, ICDF2C 2026, Reykjavík, Iceland, September 8–10, 2026.The 30 full papers included in this book were carefully reviewed and selected from 123 submissions. They are organized into the following topical sections: AI Vulnerabilities; Detecting and Analysing GenAI Output; AI-Enhanced Investigations; Critical Infrastructure Resilience; Cryptography and Steganography; Encrypted Traffic Analysis; Software Analysis and Forensics; Evidence Triage and Threat Detection Tools; Ensuring Trust; and Human Factors.