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.
- Hack The Box
- CTF 365 (free for 30 days then )
These types of platforms offer some free training in cybersecurity. They are hands-on excercises targeting specific vulnerabilities.