Posts for tag organizers

• [GCTF 2022] Cycling

  Robin Jadoul

  Jul 05, 2022

  gctf, organizers, crypto, RSA, factoring

  Pack out your quantum computer and perform 2^1025-3 encryptions to solve this challenge. Good luck doing this in 48h.

• [GCTF 2022] Treebox

  Robin Jadoul

  Jul 04, 2022

  gctf, organizers, misc, pyjail

  I think I finally got Python sandboxing right.

• [DiceCTF 2022] TI-1337 Silver Edition

  Robin Jadoul

  Feb 08, 2022

  dicectf, organizers, misc, pyjail

  Back in the day the silver edition was the top of the line Texas Instruments calculator, but now the security is looking a little obsolete. Can you break it?

• [DiceCTF 2022] Typed

  Robin Jadoul

  Feb 08, 2022

  dicectf, organizers, rev, rust

  ~~Haskell~~ Rust is a dynamically typed, interpreted language. Can you get my code to stop erroring?

• [SECCON CTF 2021] Sign Wars

  Robin Jadoul

  Dec 13, 2021

  seccon, organizers, crypto, ECDSA, lattice, mt19937

  A long time ago in a galaxy far, far away....

• [pbctf 2020] Gcombo

  Robin Jadoul

  Dec 07, 2020

  pbctf, organizers, misc, google forms, graph

  One day I spied out my friend accessing some google form to enter his secret combination lock. Afterwards, I kept bothering him about it, and he finally decided to give the link to me. Maybe you can figure out his combo for me and get a tasty flag in return

• [pbctf 2020] R0bynotes

  Robin Jadoul

  Dec 07, 2020

  pbctf, organizers, web, ruby, filter bypass, deserialization

  Rails is secure by default so it's perfect for my amazing notes app

• [pbctf 2020] Sploosh

  Robin Jadoul

  Dec 07, 2020

  pbctf, organizers, web, SSRF

  I wanted to make my own URL scraper, but parsing HTML is hard, so I used some random open source scraping project instead.

• [pbctf 2020] LeaK

  Robin Jadoul

  Dec 07, 2020

  pbctf, organizers, crypto, EHNP, ECDSA, nonce

  I know there's a famous attack on biased nonces. Then, how about this?

• [pbctf 2020] Queensarah2

  Robin Jadoul

  Dec 07, 2020

  pbctf, organizers, crypto, symmetric, cryptanalysis

  The secret mainframe for a distributed hacker group has been discovered. We have managed to exfiltrate some of the code that it runs, but we don't have a physical copy of their access badges. Can you still get the flag?

• [0CTF/TCTF qualifiers 2020] PyAuCalc

  Robin Jadoul

  Jun 29, 2020

  0CTF/TCTF, organizers, python, pyjail

  Use Python 3.8 audit hooks to protect my calculator!