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 | 4 solves |
| CTF Archive | Sus (ImaginaryCTF) | 0 | 4 solves |
| CTF Archive | Share (HITCON CTF) | 0 | 4 solves |
| CTF Archive | Leet Universe (ImaginaryCTF (Daily)) | 0 | 9 solves |
| CTF Archive | Hyper512 (HITCON CTF) | 0 | 7 solves |
| CTF Archive | Maybe Someday (GoogleCTF) | 0 | 3 solves |
| CTF Archive | Hamiltonicity 2 (CryptoHack) | 0 | 59 solves |
| CTF Archive | Fischlin's Transformation (CryptoHack) | 0 | 65 solves |
| CTF Archive | OR Proof (CryptoHack) | 0 | 147 solves |
| CTF Archive | Ticket Maestro (CryptoHack) | 0 | 44 solves |
| CTF Archive | Additional problems (CSC Belgium) | 0 | 7 solves |
| CTF Archive | Hamiltonicity (CryptoHack) | 0 | 103 solves |
| Symmetric Ciphers | Pad Thai | 80 | 268 solves |
| Symmetric Ciphers | The Good, The Pad, The Ugly | 100 | 216 solves |
| Symmetric Ciphers | Oracular Spectacular | 150 | 135 solves |
| Hash Functions | Merkle Trees | 25 | 229 solves |
| Elliptic Curves | Checkpoint | 150 | 92 solves |
| Elliptic Curves | An Evil Twisted Mind | 175 | 78 solves |
| Elliptic Curves | A Twisted Mind | 80 | 112 solves |
| Elliptic Curves | An Exceptional Twisted Mind | 125 | 70 solves |
| Isogenies | Introduction to Isogenies | 10 | 280 solves |
| Isogenies | Montgomery Curves | 30 | 180 solves |
| Isogenies | Where's the Supersingular Curve | 25 | 208 solves |
| Isogenies | Image Point Arithmetic | 30 | 197 solves |
| Isogenies | DLOG on the Surface | 40 | 136 solves |
| Isogenies | The j-invariant | 20 | 253 solves |
| Isogenies | Better than Linear | 85 | 90 solves |
| Isogenies | Meet me in the Claw | 120 | 70 solves |
| Isogenies | André Encoding | 80 | 86 solves |
| Isogenies | Dual Masters | 90 | 71 solves |
| Isogenies | What's My Kernel | 70 | 96 solves |
| Isogenies | Abelian SIDH | 90 | 76 solves |
| Isogenies | A True Genus | 175 | 58 solves |
| Isogenies | Secret Exponents | 60 | 109 solves |
| Isogenies | Special Isogenies | 30 | 116 solves |
| Isogenies | Twisted CSIDH Isogenies | 70 | 108 solves |
| Isogenies | Prime Power Isogenies | 50 | 115 solves |
| Isogenies | CSIDH Key Exchange | 90 | 102 solves |
| Isogenies | Composite Isogenies | 60 | 136 solves |
| Isogenies | Breaking SIDH | 250 | 71 solves |
| Isogenies | Three Isogenies | 35 | 143 solves |
| Isogenies | SIDH Key Exchange | 80 | 128 solves |
| Isogenies | Two Isogenies | 30 | 144 solves |
| ZKPs | Mister Saplin's Preview | 80 | 97 solves |
| ZKPs | Mister Saplins The Prover | 125 | 89 solves |
| ZKPs | Pairing-Based Cryptography | 50 | 119 solves |
| ZKPs | Let's Prove It Again | 175 | 77 solves |
| ZKPs | Couples | 100 | 85 solves |
| ZKPs | Let's Prove It | 120 | 81 solves |
| ZKPs | Hamiltonicity 2 | 175 | 71 solves |
Least Solved
| Category | Challenge | Points | Solves |
| CTF Archive | Maybe Someday (GoogleCTF) | 0 | 3 solves |
| CTF Archive | ECLCG (HITCON CTF) | 0 | 4 solves |
| CTF Archive | Share (HITCON CTF) | 0 | 4 solves |
| CTF Archive | Sus (ImaginaryCTF) | 0 | 4 solves |
| CTF Archive | diffecient (SekaiCTF) | 0 | 5 solves |
| CTF Archive | Additional problems (CSC Belgium) | 0 | 7 solves |
| CTF Archive | Authenticator (Firebird Internal CTF) | 0 | 7 solves |
| CTF Archive | Functional (ICC Athens) | 0 | 7 solves |
| CTF Archive | Hyper512 (HITCON CTF) | 0 | 7 solves |
| CTF Archive | Maybe Someday (Maybe Someday CTF) | 0 | 7 solves |
| CTF Archive | GLP420 (HackTM CTF) | 0 | 7 solves |
| CTF Archive | FaILProof Revenge (SekaiCTF) | 0 | 7 solves |
| CTF Archive | Substitution Cipher III (DownUnderCTF) | 0 | 8 solves |
| CTF Archive | unrandom DSA (HackTM CTF) | 0 | 8 solves |
| CTF Archive | Key recovery (DCTF) | 0 | 9 solves |
| CTF Archive | Leet Universe (ImaginaryCTF (Daily)) | 0 | 9 solves |
| CTF Archive | RSA Permutation (WACON) | 0 | 10 solves |
| CTF Archive | C0ll1d3r (Firebird Internal CTF) | 0 | 10 solves |
| CTF Archive | RSA Secret Sharing (WACON) | 0 | 11 solves |
| CTF Archive | Probability (SEETF) | 0 | 11 solves |
| CTF Archive | Signature (TSJ CTF) | 0 | 11 solves |
| CTF Archive | SpongeBob SquarePants / Battle for Bikini Bottom - Rehydrated (HTB Cyber Apocalypse) | 0 | 11 solves |
| CTF Archive | broken oracle (HackTM CTF) | 0 | 12 solves |
| CTF Archive | Sratslla SEA (HKCERT CTF) | 0 | 12 solves |
| CTF Archive | Sign In Please, Again (HKCERT CTF) | 0 | 12 solves |