A CTF event is usually timed, and the points are totaled once the time has expired. The winning player/team will be the one that solved the most challenges, and thus, secured the highest score.



Organization Description Directory
Crackmes A place where you can download crackmes to improve your reverse engineering skills. register-profile
Cryptohack A fun free platform for learning modern cryptography. register-profile
CTF Challenge Collection of 12 vulnerable web applications, each one has its own realistic infrastructure built over several subdomains containing vulnerabilities. register-profile
CTFLearn Learn cybersecurity the most beginner-friendly way to get into hacking. register-profile
CTF Time CTF Time is a useful site for teams to organize their participation in CTFs and assemble Teams. The site shows CTF Rankings over time for a team. register-profile
DomGoat DOM security learning platform N/A
Hack The Box Massive online cyber security training platform, allowing individuals, companies, universities and all kinds of organizations around the world to level up their hacking skills. freemium-serviceregister-profile
Nightmare Nightmare is an intro to binary exploitation / reverse engineering course based around ctf challenges. register-profile
Offensive Security Practice your pentesting skills in a standalone, private lab environment within Offensive Security’s Proving Grounds freemium-service register-profile
pwnable.tw Pwnable.tw is a wargame site for hackers to test and expand their binary exploiting skills. register-profile
pwnable.kr A non-commercial wargame site which provides various pwn challenges regarding system exploitation. register-profile
pwnable.xyz Beginner tailored CTF challenges. register-profile
ringzer0ctf Ringzero CTF Challenges register-profile
ROP Emporium Learn return-oriented programming through a series of challenges. register-profile
Roppers Academy Learn the fundamentals of Computing Fundamentals through Return Oriented Programming. register-profile
Try Hack Me (King of the Hill) Making it easier to break into security, all through your browser. register-profile
VulnHub Provide materials that allows anyone to gain practical ‘hands-on’ experience in digital security. N/A


Organization Description Directory
Hack-a-Sat United States Air Force and United States Space Force jointly presents Hack-A-Sat. register-profile