Browse the archive by tags here.
Posts for March 2024
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[KalmarCTF 2024] BreakfaestMar 18, 2024
I heard that you could use VOLE-in-the-head to make post-quantum signatures. Here's a signature scheme based on the Poseidon hash function. Can you create a forgery?
Posts for February 2024
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Practical lattice reductions for CTF challengesFeb 26, 2024
A training for team Europe, getting in shape for the next edition of the ICC.
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[DiceCTF Quals 2024] Diligent AuditorFeb 11, 2024
I hired an auditor to secure my python interpreter!
Posts for July 2023
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[UIUCTF 2023] Vimjail {1,2}{,.5}Jul 02, 2023
Four jails were made for the king of editors, one exploit to rule them all.
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[UIUCTF 2023] Rattler ReadJul 02, 2023
All these poisonous snakes keep biting me. Good think I remembered to bring restrictedpython to keep me safe!
Posts for July 2022
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[GCTF 2022] CyclingJul 05, 2022
Pack out your quantum computer and perform 2^1025-3 encryptions to solve this challenge. Good luck doing this in 48h.
Posts for February 2022
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[DiceCTF 2022] TI-1337 Silver EditionFeb 08, 2022
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?
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[DiceCTF 2022] TypedFeb 08, 2022
~~Haskell~~ Rust is a dynamically typed, interpreted language. Can you get my code to stop erroring?
Posts for December 2021
Posts for June 2021
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[Intigriti XSS challenge] May 2021Jun 01, 2021
🤖 Are you a robot? Our intern built this handy captcha to find out!
Posts for May 2021
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[ictf Apr 2021] My challengesMay 01, 2021
Posts for April 2021
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[ictf Mar 2021] My challengesApr 01, 2021
Posts for March 2021
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[ictf Feb 2021] My challengesMar 01, 2021
Posts for January 2021
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Factoring in logarithmic time: a mathemagic trickJan 22, 2021
Debunking crackpot claims for fun and profit
Posts for December 2020
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[pbctf 2020] GcomboDec 07, 2020
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
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[pbctf 2020] SplooshDec 07, 2020
I wanted to make my own URL scraper, but parsing HTML is hard, so I used some random open source scraping project instead.
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[pbctf 2020] R0bynotesDec 07, 2020
Rails is secure by default so it's perfect for my amazing notes app
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[pbctf 2020] LeaKDec 07, 2020
I know there's a famous attack on biased nonces. Then, how about this?
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[pbctf 2020] Queensarah2Dec 07, 2020
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?
Posts for November 2020
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[Donjon CTF 2020] BLS Signatures and Secret RNGNov 23, 2020
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[Donjon CTF 2020] Atmega Pwn: PicoHSM ChallengesNov 19, 2020
Pwning picoHSM, a series of three challenges
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[Donjon CTF 2020] Hacking EOS: Modern CryptocomputerNov 18, 2020
Exploiting EOS nodes through smart contracts
Posts for June 2020
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[0CTF/TCTF qualifiers 2020] PyAuCalcJun 29, 2020
Use Python 3.8 audit hooks to protect my calculator!
Posts for November 2019
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[ASIS CTF Finals 2019] AndexNov 19, 2019
I've learnt that DEX files in android are so secure which attackers cannot modify them!
Posts for October 2018
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[Halloween crypto puzzles] JedOct 06, 2018
Posts for September 2018
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[IceCTF 2018] PostedSep 22, 2018