h4cker

The repository spans offensive security techniques, defensive practices, CTF (capture the flag) challenge resources, and AI-powered security research, making it one of the most widely referenced open resources for cybersecurity professionals and students.

The collection is organized into domains including network penetration testing, web application security, mobile security, cloud security, reverse engineering, malware analysis, and AI/ML security research.

For each domain, h4cker provides curated tool lists, methodology references, vulnerable practice environments, and sample exploit code for educational purposes. It also includes resources aligned with major certification frameworks (OSCP, CEH, CISSP) and security standards (OWASP, NIST, MITRE ATT&CK).

Omar Santos is a Principal Engineer at Cisco Talos and the author of multiple O'Reilly security books, and the repository reflects his applied expertise in both offensive techniques and enterprise security architecture.

The project has over 17,000 GitHub stars and is used by security practitioners at all experience levels from students preparing for their first CTF to professional red teamers building custom toolchains.

All content is provided for educational and authorized testing purposes only, with explicit guidance on legal and ethical use.