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 | 205 solves |
| Mathematics | Gaussian Reduction | 50 | 126 solves |
| Mathematics | Find the Lattice | 60 | 54 solves |
| Mathematics | Vectors | 10 | 210 solves |
| Mathematics | Backpack Cryptography | 150 | 35 solves |
| Mathematics | Gram Schmidt | 30 | 131 solves |
| Mathematics | What's a Lattice? | 40 | 147 solves |
| Mathematics | Unencryptable | 100 | 52 solves |
| Misc | Too Many Errors | 100 | 35 solves |
| Block Ciphers | Forbidden Fruit | 150 | 32 solves |
| Misc | Collider | 50 | 81 solves |
| Misc | MD0 | 80 | 48 solves |
| Block Ciphers | Triple DES | 60 | 58 solves |
| Mathematics | Modular Square Root | 35 | 318 solves |
| Mathematics | Broken RSA | 100 | 122 solves |
| Mathematics | Real Eisenstein | 150 | 47 solves |
| Block Ciphers | Keyed Permutations | 5 | 473 solves |
| Block Ciphers | Structure of AES | 15 | 341 solves |
| Block Ciphers | Round Keys | 20 | 318 solves |
| Block Ciphers | Resisting Bruteforce | 10 | 432 solves |
| Block Ciphers | Confusion through Substitution | 25 | 270 solves |
| Block Ciphers | Bringing It All Together | 50 | 215 solves |
| Block Ciphers | Diffusion through Permutation | 30 | 249 solves |
| RSA | Bespoke Padding | 100 | 74 solves |
| Misc | Nothing Up My Sleeve | 150 | 44 solves |
| Elliptic Curves | Moving Problems | 150 | 51 solves |
| Block Ciphers | Paper Plane | 120 | 75 solves |
| Mathematics | Prime and Prejudice | 200 | 69 solves |
| General | XOR Properties | 15 | 1203 solves |
| Misc | Toshi's Treasure | 150 | 69 solves |
| Mathematics | Legendre Symbol | 35 | 447 solves |
| Mathematics | Quadratic Residues | 25 | 675 solves |
| RSA | Crossed Wires | 100 | 205 solves |
| Elliptic Curves | Elliptic Nodes | 150 | 63 solves |
| Diffie-Hellman | Static Client 2 | 150 | 83 solves |
| Misc | Bit by Bit | 120 | 82 solves |
| Misc | Lo-Hi Card Game | 120 | 86 solves |
| Elliptic Curves | Micro Transmissions | 120 | 71 solves |
| Elliptic Curves | Curveball | 100 | 82 solves |
| RSA | Fast Primes | 75 | 150 solves |
| Block Ciphers | Block Cipher Mode Starter | 15 | 632 solves |
| Mathematics | Adrien's Signs | 60 | 307 solves |
| Elliptic Curves | Scalar Multiplication | 35 | 215 solves |
| Elliptic Curves | Curves and Logs | 40 | 202 solves |
| Elliptic Curves | Efficient Exchange | 50 | 181 solves |
| Elliptic Curves | Smooth Criminal | 60 | 132 solves |
| Elliptic Curves | Exceptional Curves | 100 | 95 solves |
| Elliptic Curves | ProSign 3 | 100 | 77 solves |
| Elliptic Curves | Point Negation | 10 | 237 solves |
| Elliptic Curves | Point Addition | 30 | 220 solves |
Least Solved
| Category | Challenge | Points | Solves |
| Block Ciphers | Forbidden Fruit | 150 | 32 solves |
| Misc | Too Many Errors | 100 | 35 solves |
| Mathematics | Backpack Cryptography | 150 | 35 solves |
| Misc | Nothing Up My Sleeve | 150 | 44 solves |
| Mathematics | Real Eisenstein | 150 | 47 solves |
| Misc | MD0 | 80 | 48 solves |
| Elliptic Curves | Moving Problems | 150 | 51 solves |
| Mathematics | Unencryptable | 100 | 52 solves |
| Mathematics | Find the Lattice | 60 | 54 solves |
| Block Ciphers | Triple DES | 60 | 58 solves |
| Elliptic Curves | Elliptic Nodes | 150 | 63 solves |
| Mathematics | Prime and Prejudice | 200 | 69 solves |
| Misc | Toshi's Treasure | 150 | 69 solves |
| Elliptic Curves | Micro Transmissions | 120 | 71 solves |
| RSA | Bespoke Padding | 100 | 74 solves |
| Block Ciphers | Paper Plane | 120 | 75 solves |
| Elliptic Curves | ProSign 3 | 100 | 77 solves |
| Misc | Collider | 50 | 81 solves |
| Misc | Bit by Bit | 120 | 82 solves |
| Elliptic Curves | Curveball | 100 | 82 solves |
| Diffie-Hellman | Static Client 2 | 150 | 83 solves |
| Misc | Lo-Hi Card Game | 120 | 86 solves |
| Elliptic Curves | Exceptional Curves | 100 | 95 solves |
| RSA | Vote for Pedro | 150 | 102 solves |
| Misc | Armory | 100 | 106 solves |