Resources

CTFTime

CTFTime is the authoritative source of all CTF competitions, including event listing, team ranking, and a centralized writeup directory.

Activity-based Resources

These are good places to start looking for challenges.

General:

• OverTheWire wargames: Several hosted services that help you practice offensive security
• CTFLearn: Hosts many CTF challenges
• PicoCTF: CMU-hosted high school CTF, challenges are up to stay so good practice material

Crypto:

• CryptoPals: Hands-on introduction to cryptographic principles, including block / stream ciphers, randomness, Diffie-Hellman, RSA, and more

Binary-exploit / Reversing:

• Microcorruption: An embedded reverse-engineering challenge that involves breaking into a simulated embedded device
• Crackmes.one: Grab-bag of binary exploit challenges
• Pwnable.kr: Grab-bag of binary exploit challenges

Web:

• HackThisSite: Web vulnerability sandbox where you can put your web skills to the test

Reading-based Resources

• CTF 101
• So, you want to CTF?
• Smashing The Stack For Fun And Profit

Useful Courses

• csci 2021
• csci 4061
• csci 4211
• csci 5271
• math 5248

Tools

• Awesome CTF: List of CTF tools
• Day 18 Essential CTF Tools: List of CTF tools
• CyberChef: A swiss-army knife for data manipulation, including encoding / decoding, encryption / decryption, compression / decompression, and other ciphers and analyses
• PayloadsAllTheThings: “A list of useful payloads and bypass for Web Application Security and Pentest/CTF”