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Root-Xmas Challenge 2024 - Write-Ups for Days 1 to 6
These challenges were part of the Root-Xmas Challenge which was organized by Root-Me. This event was an Advent Calendar made with CTF challenges. Day 1 - Generous Santa (Web) Description: The number of Santa’s lunti has increased by 1337 this year, and there are a lot of them! Thanks to...
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(Crypto - SECCON CTF 13) reiwa_rot13
TL;DR: Franklin-Reiter related-message attack. Description: Reiwa is latest era name in Japanese(from 2019). it’s latest rot13 challenge! Introduction For this challenge, we are given an archive containing: a Python script chall.py: from Crypto.Util.number import * import codecs import string import random import hashlib from Crypto.Cipher import AES from Crypto.Random import...
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(Crypto - 404CTF 2024) La Seine
TL;DR: Custom “signature” algorithm, based on 2x2-matrix operations. Decomposition of integers in sum of two squares. Description (in French): La compétition d’apnée est sur le point de commencer, l’eau est un peu trouble mais les épreuves précédentes ont sculpté votre détermination. Au moment où vous vous apprêtez à rentrer dans...