# Writeups

Here is a collection of write ups and discussions of the challenges I have solved in various capture the flag competitions. The focus is usually the cryptographic challenges.

## CTF Writeups

CTF | Category |
---|---|

Crypto CTF 2021 | Elliptic & Edwards Curves, RSA, Diophantine Eqns. |

Cyber Apocalypse CTF 2021 | RSA, Elliptic & Hyperelliptic Curves, Multivariate, Maths |

Zer0pts 2021 | Elliptic Curves, Polynoimial Rings |

TetCTF 2021 | Gaussian Integers, Discrete Log Problem, Finite Fields |

CryptoCTF 2020 | Moebius Inversion, Unsolved (Unsolvable?) |

CryptoCTF 2020 | Team Writeup, all challenges |

Chujowy | Elliptic Curves |

ASIS Quals 2020 | Elliptic Curves, RSA, Blum-Goldwasser, Diophantine Eqns. |

0CTF 2020 | DSA, Hyperelliptic Curves |

redpwn 2020 | RSA, ECDSA, Elliptic Curves |

HackTM | Crypto, OSint |

INS’HACK | RSA |

SecurityFest | Modular Arithmetic |

HSCTF 2019 | Crypto |

picoCTF 2019 | General, Binary, Crypto, Forensics, Web |

## Misc

Some other CTF-like problems I’ve looked into, with some code and thoughts (*this is very much a work in progress*).