represents the best resources according to us
Jeopardy / Choose your challenge
You decide which challenge you try to solve. Like a CTF buffet.
- RingZer0 Team Online CTF
- VulnHub, many vulnerable VMs
You proceed through increasingly difficult challenges that are usually related one to another. Very good to develop a deep expertise on a specific topic.
embedded system exploitation with a custom assembly
- The Matasano Crypto Challenges
- Smash The Stack
- alert1 to win (XSS only)
- Regex Golf (Regex only)
- Lost Chall
These types of challenges usually resembles more what an actual pentest or red team engagement will look like.
These types of platforms offer some free training in cybersecurity. They are hands-on excercises targeting specific vulnerabilities.