AltayCTF 2026
- Starts
- Ends
- Runs for
- 9 hours
- Format
- Attack-Defense (onsite, Russia, Barnaul)
- Rating weight
- Unrated by CTFtime
- Teams registered
- not published
Run by SharLike.
Prep briefing
What past editions were made of
Counted across 65 challenges from 2025, 2024, 2023, 2019, using the categories the scoreboards themselves used. Two things to hold in mind while reading it. The archive indexes challenges that someone published a solution to, not whole scoreboards, so this is the shape of what people wrote about rather than of everything that was set. And where a scoreboard gave no category the challenge lands in misc, so a large misc slice means “unlabelled” rather than “miscellaneous”.
- misc 100%(1)
What to have open when it starts
Misc
Misc is whatever did not fit, which in practice means encodings and esolangs. Identify, do not guess.
- Cipher identifier and automatic decoder
- Recipe builder: chain decodes and transforms
- Brainfuck and esolang decoder
- Base64 decoder and encoder
- Regex tester with match offsets and capture groups
New to this? Read Recognising encodings, Misc, esolangs and prompt injection
The challenges people wrote about most
From previous editions, ordered by how many published solutions each attracted. Reading two solutions to one of these is the closest thing to a warm-up for this event that exists.
- Bootstrap.Minunknown · 2019 · 3 writeups
- Bootstrap.Bundle.Minunknown · 2019 · 2 writeups
- Effectsunknown · 2019 · 2 writeups
- Manipulationunknown · 2019 · 2 writeups
- Traversingunknown · 2019 · 2 writeups
- 2019 08 19 000000 Create Failed Jobs Tableunknown · 2023 · 1 writeup