New Challenges
This page contains lists of recent and most difficult challenges. To play the challenges, please go to the challenges section.
Recently Released
| Category | Challenge | Points | Solves |
| CTF Archive | 1n_jection | 0 | 1 solves |
| CTF Archive | FaILProof | 0 | 0 solves |
| CTF Archive | Real Mersenne | 0 | 1 solves |
| CTF Archive | C0ll1d3r | 0 | 1 solves |
| CTF Archive | FaILProof Revenge | 0 | 0 solves |
| CTF Archive | Chaos | 0 | 1 solves |
| CTF Archive | import numpy as MT | 0 | 1 solves |
| CTF Archive | Twist and Shout | 0 | 1 solves |
| CTF Archive | diffecient | 0 | 0 solves |
| CTF Archive | Key Backup Service 2 | 0 | 0 solves |
| CTF Archive | Sratslla SEA | 0 | 0 solves |
| CTF Archive | Maybe Someday | 0 | 1 solves |
| CTF Archive | Lack of Entropy | 0 | 1 solves |
| CTF Archive | Tenet: The Plagarism | 0 | 0 solves |
| CTF Archive | Authenticator | 0 | 1 solves |
| CTF Archive | Cipher Mode Picker | 0 | 2 solves |
| CTF Archive | A Joke Cipher | 0 | 2 solves |
| CTF Archive | Sign In Please, Again | 0 | 0 solves |
| CTF Archive | Oofbleck | 0 | 1 solves |
| CTF Archive | Key Backup Service 1 | 0 | 0 solves |
| CTF Archive | 1337crypt | 0 | 15 solves |
| CTF Archive | Substitution Cipher III | 0 | 2 solves |
| CTF Archive | 1337crypt v2 | 0 | 4 solves |
| CTF Archive | Signature | 0 | 4 solves |
| CTF Archive | pekobot | 0 | 6 solves |
| CTF Archive | RSA Permutation | 0 | 4 solves |
| CTF Archive | Dark Arts | 0 | 6 solves |
| CTF Archive | RSA Secret Sharing | 0 | 3 solves |
| CTF Archive | Unimplemented | 0 | 8 solves |
| CTF Archive | Unevaluated | 0 | 3 solves |
| CTF Archive | Calm Down | 0 | 14 solves |
| CTF Archive | 2020 | 0 | 20 solves |
| CTF Archive | Key recovery | 0 | 4 solves |
| CTF Archive | Unbalanced | 0 | 4 solves |
| CTF Archive | Probability | 0 | 5 solves |
| CTF Archive | ed25519 magic | 0 | 8 solves |
| CTF Archive | Sign in Please | 0 | 13 solves |
| CTF Archive | Functional | 0 | 3 solves |
| CTF Archive | SpongeBob SquarePants / Battle for Bikini Bottom - Rehydrated | 0 | 6 solves |
| Mathematics | No Way Back Home | 100 | 272 solves |
| Symmetric Ciphers | Beatboxer | 150 | 90 solves |
| Hash Functions | MDFlag | 125 | 103 solves |
| Crypto on the Web | TLS Handshake | 15 | 353 solves |
| Crypto on the Web | Saying Hello | 20 | 340 solves |
| Crypto on the Web | Secure Protocols | 5 | 414 solves |
| Crypto on the Web | Sharks on the Wire | 10 | 381 solves |
| Elliptic Curves | Real Curve Crypto | 200 | 56 solves |
| Crypto on the Web | RSA or HMAC? Part 2 | 100 | 371 solves |
| Mathematics | Roll your Own | 125 | 240 solves |
| Symmetric Ciphers | Dancing Queen | 120 | 276 solves |
Least Solved
| Category | Challenge | Points | Solves |
| CTF Archive | FaILProof Revenge | 0 | 0 solves |
| CTF Archive | FaILProof | 0 | 0 solves |
| CTF Archive | Key Backup Service 2 | 0 | 0 solves |
| CTF Archive | Key Backup Service 1 | 0 | 0 solves |
| CTF Archive | Sratslla SEA | 0 | 0 solves |
| CTF Archive | Tenet: The Plagarism | 0 | 0 solves |
| CTF Archive | diffecient | 0 | 0 solves |
| CTF Archive | Sign In Please, Again | 0 | 0 solves |
| CTF Archive | Oofbleck | 0 | 1 solves |
| CTF Archive | Authenticator | 0 | 1 solves |
| CTF Archive | Maybe Someday | 0 | 1 solves |
| CTF Archive | Real Mersenne | 0 | 1 solves |
| CTF Archive | 1n_jection | 0 | 1 solves |
| CTF Archive | C0ll1d3r | 0 | 1 solves |
| CTF Archive | Twist and Shout | 0 | 1 solves |
| CTF Archive | Chaos | 0 | 1 solves |
| CTF Archive | Lack of Entropy | 0 | 1 solves |
| CTF Archive | import numpy as MT | 0 | 1 solves |
| CTF Archive | Substitution Cipher III | 0 | 2 solves |
| CTF Archive | Cipher Mode Picker | 0 | 2 solves |
| CTF Archive | A Joke Cipher | 0 | 2 solves |
| CTF Archive | Unevaluated | 0 | 3 solves |
| CTF Archive | RSA Secret Sharing | 0 | 3 solves |
| CTF Archive | Functional | 0 | 3 solves |
| CTF Archive | RSA Permutation | 0 | 4 solves |