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 | ECLCG (HITCON CTF) | 0 | 11 solves |
| CTF Archive | Sus (ImaginaryCTF) | 0 | 20 solves |
| CTF Archive | Share (HITCON CTF) | 0 | 12 solves |
| CTF Archive | Leet Universe (ImaginaryCTF (Daily)) | 0 | 23 solves |
| CTF Archive | Hyper512 (HITCON CTF) | 0 | 10 solves |
| CTF Archive | Maybe Someday (GoogleCTF) | 0 | 10 solves |
| CTF Archive | Hamiltonicity 2 (CryptoHack) | 0 | 85 solves |
| CTF Archive | Fischlin's Transformation (CryptoHack) | 0 | 92 solves |
| CTF Archive | OR Proof (CryptoHack) | 0 | 216 solves |
| CTF Archive | Ticket Maestro (CryptoHack) | 0 | 69 solves |
| CTF Archive | Additional problems (CSC Belgium) | 0 | 18 solves |
| CTF Archive | Hamiltonicity (CryptoHack) | 0 | 154 solves |
| Symmetric Ciphers | Pad Thai | 80 | 506 solves |
| Symmetric Ciphers | The Good, The Pad, The Ugly | 100 | 389 solves |
| Symmetric Ciphers | Oracular Spectacular | 150 | 183 solves |
| Hash Functions | Merkle Trees | 25 | 393 solves |
| Elliptic Curves | Checkpoint | 150 | 139 solves |
| Elliptic Curves | An Evil Twisted Mind | 175 | 126 solves |
| Elliptic Curves | A Twisted Mind | 80 | 181 solves |
| Elliptic Curves | An Exceptional Twisted Mind | 125 | 118 solves |
| Isogenies | Introduction to Isogenies | 10 | 518 solves |
| Isogenies | Montgomery Curves | 30 | 303 solves |
| Isogenies | Where's the Supersingular Curve | 25 | 347 solves |
| Isogenies | Image Point Arithmetic | 30 | 340 solves |
| Isogenies | DLOG on the Surface | 40 | 242 solves |
| Isogenies | The j-invariant | 20 | 434 solves |
| Isogenies | Better than Linear | 85 | 166 solves |
| Isogenies | Meet me in the Claw | 120 | 122 solves |
| Isogenies | André Encoding | 80 | 159 solves |
| Isogenies | Dual Masters | 90 | 131 solves |
| Isogenies | What's My Kernel | 70 | 175 solves |
| Isogenies | Abelian SIDH | 90 | 148 solves |
| Isogenies | A True Genus | 175 | 109 solves |
| Isogenies | Secret Exponents | 60 | 188 solves |
| Isogenies | Special Isogenies | 30 | 196 solves |
| Isogenies | Twisted CSIDH Isogenies | 70 | 184 solves |
| Isogenies | Prime Power Isogenies | 50 | 194 solves |
| Isogenies | CSIDH Key Exchange | 90 | 173 solves |
| Isogenies | Composite Isogenies | 60 | 233 solves |
| Isogenies | Breaking SIDH | 250 | 125 solves |
| Isogenies | Three Isogenies | 35 | 239 solves |
| Isogenies | SIDH Key Exchange | 80 | 220 solves |
| Isogenies | Two Isogenies | 30 | 250 solves |
| ZKPs | Mister Saplin's Preview | 80 | 144 solves |
| ZKPs | Mister Saplins The Prover | 125 | 131 solves |
| ZKPs | Pairing-Based Cryptography | 50 | 184 solves |
| ZKPs | Let's Prove It Again | 175 | 109 solves |
| ZKPs | Couples | 100 | 131 solves |
| ZKPs | Let's Prove It | 120 | 118 solves |
| ZKPs | Hamiltonicity 2 | 175 | 107 solves |
Least Solved
| Category | Challenge | Points | Solves |
| CTF Archive | diffecient (SekaiCTF) | 0 | 8 solves |
| CTF Archive | Hyper512 (HITCON CTF) | 0 | 10 solves |
| CTF Archive | Maybe Someday (GoogleCTF) | 0 | 10 solves |
| CTF Archive | ECLCG (HITCON CTF) | 0 | 11 solves |
| CTF Archive | Functional (ICC Athens) | 0 | 11 solves |
| CTF Archive | unrandom DSA (HackTM CTF) | 0 | 11 solves |
| CTF Archive | GLP420 (HackTM CTF) | 0 | 11 solves |
| CTF Archive | Substitution Cipher III (DownUnderCTF) | 0 | 12 solves |
| CTF Archive | Share (HITCON CTF) | 0 | 12 solves |
| CTF Archive | Maybe Someday (Maybe Someday CTF) | 0 | 12 solves |
| CTF Archive | FaILProof Revenge (SekaiCTF) | 0 | 12 solves |
| CTF Archive | Authenticator (Firebird Internal CTF) | 0 | 13 solves |
| CTF Archive | SpongeBob SquarePants / Battle for Bikini Bottom - Rehydrated (HTB Cyber Apocalypse) | 0 | 13 solves |
| CTF Archive | Probability (SEETF) | 0 | 14 solves |
| CTF Archive | RSA Permutation (WACON) | 0 | 15 solves |
| CTF Archive | Key recovery (DCTF) | 0 | 15 solves |
| CTF Archive | Sign In Please, Again (HKCERT CTF) | 0 | 15 solves |
| CTF Archive | FaILProof (SekaiCTF) | 0 | 15 solves |
| CTF Archive | RSA Secret Sharing (WACON) | 0 | 16 solves |
| CTF Archive | Signature (TSJ CTF) | 0 | 16 solves |
| CTF Archive | broken oracle (HackTM CTF) | 0 | 16 solves |
| CTF Archive | Real Mersenne (Zh3r0 CTF V2) | 0 | 17 solves |
| CTF Archive | C0ll1d3r (Firebird Internal CTF) | 0 | 17 solves |
| CTF Archive | Additional problems (CSC Belgium) | 0 | 18 solves |
| CTF Archive | What a Curve! (Breizh CTF) | 0 | 18 solves |