This page contains lists of recent and most difficult challenges. To play the challenges, please go to the challenges section.

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 |

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 |

You are now level Current level