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

Category | Challenge | Points | Solves |

General | Transparency | 50 | 137 solves |

RSA | Let's Decrypt Again | 175 | 26 solves |

Misc | Twin Keys | 100 | 23 solves |

Misc | Invariant | 250 | 15 solves |

Misc | No Difference | 175 | 25 solves |

Misc | Trust Games | 150 | 20 solves |

Misc | PriMeD5 | 100 | 50 solves |

Mathematics | Ellipse Curve Cryptography | 125 | 48 solves |

RSA | Let's Decrypt | 80 | 61 solves |

Elliptic Curves | No Random, No Bias | 120 | 40 solves |

Elliptic Curves | Edwards Goes Degenerate | 100 | 28 solves |

Mathematics | Size and Basis | 15 | 458 solves |

Mathematics | Gaussian Reduction | 50 | 271 solves |

Mathematics | Find the Lattice | 100 | 137 solves |

Mathematics | Vectors | 10 | 473 solves |

Mathematics | Backpack Cryptography | 120 | 90 solves |

Mathematics | Gram Schmidt | 30 | 298 solves |

Mathematics | What's a Lattice? | 40 | 322 solves |

Mathematics | Unencryptable | 125 | 98 solves |

Misc | Too Many Errors | 100 | 68 solves |

Block Ciphers | Forbidden Fruit | 150 | 69 solves |

Misc | Collider | 50 | 155 solves |

Misc | MD0 | 80 | 91 solves |

Block Ciphers | Triple DES | 60 | 107 solves |

Mathematics | Modular Square Root | 35 | 534 solves |

Mathematics | Broken RSA | 100 | 202 solves |

Mathematics | Real Eisenstein | 150 | 73 solves |

Block Ciphers | Keyed Permutations | 5 | 809 solves |

Block Ciphers | Structure of AES | 15 | 565 solves |

Block Ciphers | Round Keys | 20 | 518 solves |

Block Ciphers | Resisting Bruteforce | 10 | 743 solves |

Block Ciphers | Confusion through Substitution | 25 | 445 solves |

Block Ciphers | Bringing It All Together | 50 | 336 solves |

Block Ciphers | Diffusion through Permutation | 30 | 401 solves |

RSA | Bespoke Padding | 100 | 118 solves |

Misc | Nothing Up My Sleeve | 150 | 69 solves |

Elliptic Curves | Moving Problems | 150 | 84 solves |

Block Ciphers | Paper Plane | 120 | 114 solves |

Mathematics | Prime and Prejudice | 200 | 95 solves |

General | XOR Properties | 15 | 1797 solves |

Misc | Toshi's Treasure | 150 | 96 solves |

Mathematics | Legendre Symbol | 35 | 686 solves |

Mathematics | Quadratic Residues | 25 | 1003 solves |

RSA | Crossed Wires | 100 | 328 solves |

Elliptic Curves | Elliptic Nodes | 150 | 93 solves |

Diffie-Hellman | Static Client 2 | 120 | 114 solves |

Misc | Bit by Bit | 100 | 113 solves |

Misc | Lo-Hi Card Game | 120 | 121 solves |

Elliptic Curves | Micro Transmissions | 120 | 97 solves |

Elliptic Curves | Curveball | 100 | 112 solves |

Category | Challenge | Points | Solves |

Misc | Invariant | 250 | 15 solves |

Misc | Trust Games | 150 | 20 solves |

Misc | Twin Keys | 100 | 23 solves |

Misc | No Difference | 175 | 25 solves |

RSA | Let's Decrypt Again | 175 | 26 solves |

Elliptic Curves | Edwards Goes Degenerate | 100 | 28 solves |

Elliptic Curves | No Random, No Bias | 120 | 40 solves |

Mathematics | Ellipse Curve Cryptography | 125 | 48 solves |

Misc | PriMeD5 | 100 | 50 solves |

RSA | Let's Decrypt | 80 | 61 solves |

Misc | Too Many Errors | 100 | 68 solves |

Block Ciphers | Forbidden Fruit | 150 | 69 solves |

Misc | Nothing Up My Sleeve | 150 | 69 solves |

Mathematics | Real Eisenstein | 150 | 73 solves |

Elliptic Curves | Moving Problems | 150 | 84 solves |

Mathematics | Backpack Cryptography | 120 | 90 solves |

Misc | MD0 | 80 | 91 solves |

Elliptic Curves | Elliptic Nodes | 150 | 93 solves |

Mathematics | Prime and Prejudice | 200 | 95 solves |

Misc | Toshi's Treasure | 150 | 96 solves |

Elliptic Curves | Micro Transmissions | 120 | 97 solves |

Mathematics | Unencryptable | 125 | 98 solves |

Elliptic Curves | ProSign 3 | 100 | 100 solves |

Block Ciphers | Triple DES | 60 | 107 solves |

Elliptic Curves | Curveball | 100 | 112 solves |

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