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 |
| Mathematics | Size and Basis | 15 | 305 solves |
| Mathematics | Gaussian Reduction | 50 | 182 solves |
| Mathematics | Find the Lattice | 60 | 92 solves |
| Mathematics | Vectors | 10 | 318 solves |
| Mathematics | Backpack Cryptography | 150 | 58 solves |
| Mathematics | Gram Schmidt | 30 | 199 solves |
| Mathematics | What's a Lattice? | 40 | 217 solves |
| Mathematics | Unencryptable | 100 | 69 solves |
| Misc | Too Many Errors | 100 | 53 solves |
| Block Ciphers | Forbidden Fruit | 150 | 51 solves |
| Misc | Collider | 50 | 115 solves |
| Misc | MD0 | 80 | 69 solves |
| Block Ciphers | Triple DES | 60 | 85 solves |
| Mathematics | Modular Square Root | 35 | 408 solves |
| Mathematics | Broken RSA | 100 | 156 solves |
| Mathematics | Real Eisenstein | 150 | 56 solves |
| Block Ciphers | Keyed Permutations | 5 | 580 solves |
| Block Ciphers | Structure of AES | 15 | 413 solves |
| Block Ciphers | Round Keys | 20 | 385 solves |
| Block Ciphers | Resisting Bruteforce | 10 | 529 solves |
| Block Ciphers | Confusion through Substitution | 25 | 330 solves |
| Block Ciphers | Bringing It All Together | 50 | 254 solves |
| Block Ciphers | Diffusion through Permutation | 30 | 300 solves |
| RSA | Bespoke Padding | 100 | 96 solves |
| Misc | Nothing Up My Sleeve | 150 | 54 solves |
| Elliptic Curves | Moving Problems | 150 | 70 solves |
| Block Ciphers | Paper Plane | 120 | 96 solves |
| Mathematics | Prime and Prejudice | 200 | 81 solves |
| General | XOR Properties | 15 | 1418 solves |
| Misc | Toshi's Treasure | 150 | 88 solves |
| Mathematics | Legendre Symbol | 35 | 544 solves |
| Mathematics | Quadratic Residues | 25 | 816 solves |
| RSA | Crossed Wires | 100 | 251 solves |
| Elliptic Curves | Elliptic Nodes | 150 | 80 solves |
| Diffie-Hellman | Static Client 2 | 150 | 98 solves |
| Misc | Bit by Bit | 120 | 98 solves |
| Misc | Lo-Hi Card Game | 120 | 104 solves |
| Elliptic Curves | Micro Transmissions | 120 | 85 solves |
| Elliptic Curves | Curveball | 100 | 98 solves |
| RSA | Fast Primes | 75 | 179 solves |
| Block Ciphers | Block Cipher Mode Starter | 15 | 686 solves |
| Mathematics | Adrien's Signs | 60 | 344 solves |
| Elliptic Curves | Scalar Multiplication | 35 | 256 solves |
| Elliptic Curves | Curves and Logs | 40 | 241 solves |
| Elliptic Curves | Efficient Exchange | 50 | 219 solves |
| Elliptic Curves | Smooth Criminal | 60 | 167 solves |
| Elliptic Curves | Exceptional Curves | 100 | 117 solves |
| Elliptic Curves | ProSign 3 | 100 | 92 solves |
| Elliptic Curves | Point Negation | 10 | 286 solves |
| Elliptic Curves | Point Addition | 30 | 262 solves |
Least Solved
| Category | Challenge | Points | Solves |
| Block Ciphers | Forbidden Fruit | 150 | 51 solves |
| Misc | Too Many Errors | 100 | 53 solves |
| Misc | Nothing Up My Sleeve | 150 | 54 solves |
| Mathematics | Real Eisenstein | 150 | 56 solves |
| Mathematics | Backpack Cryptography | 150 | 58 solves |
| Mathematics | Unencryptable | 100 | 69 solves |
| Misc | MD0 | 80 | 69 solves |
| Elliptic Curves | Moving Problems | 150 | 70 solves |
| Elliptic Curves | Elliptic Nodes | 150 | 80 solves |
| Mathematics | Prime and Prejudice | 200 | 81 solves |
| Elliptic Curves | Micro Transmissions | 120 | 85 solves |
| Block Ciphers | Triple DES | 60 | 85 solves |
| Misc | Toshi's Treasure | 150 | 88 solves |
| Mathematics | Find the Lattice | 60 | 92 solves |
| Elliptic Curves | ProSign 3 | 100 | 92 solves |
| Block Ciphers | Paper Plane | 120 | 96 solves |
| RSA | Bespoke Padding | 100 | 96 solves |
| Misc | Bit by Bit | 120 | 98 solves |
| Elliptic Curves | Curveball | 100 | 98 solves |
| Diffie-Hellman | Static Client 2 | 150 | 98 solves |
| Misc | Lo-Hi Card Game | 120 | 104 solves |
| Misc | Collider | 50 | 115 solves |
| Elliptic Curves | Exceptional Curves | 100 | 117 solves |
| RSA | Vote for Pedro | 150 | 123 solves |
| Misc | Armory | 100 | 128 solves |