Posts for tag pbctf

• [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?