OmniCTF 2026 Finals
- Starts
- Ends
- Runs for
- 10 hours
- Format
- Jeopardy (onsite, Romania, Constanța)
- Rating weight
- Unrated by CTFtime
- Teams registered
- not published
Run by OmniCTF, with prizes listed on CTFtime.
What the organisers say
OmniCTF 2026 Finals is the on-site final stage of OmniCTF 2026, organized by ASOCIAȚIA OMNICYBR. Our Partners: UNbreakable Romania, Delta Obscura, Spectrum Our Sponsors: OtterSec, Marina Hub SRL., CAIDO, HyperLine Robotics, Knight Squad Academy, Hetzner Qualified teams from the online qualification round will meet in Constanța, Romania, for a 9-hour cybersecurity competition featuring practical challenges across...
Prep briefing
What past editions were made of
Counted across 28 challenges from 2026, 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 32%(8)
- rev 20%(5)
- crypto 16%(4)
- forensics 16%(4)
- web 8%(2)
- pwn 8%(2)
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
Reversing
Identify the binary before you open it. Knowing it is a .pyc, a JAR or a stripped ELF decides the next hour.
- ELF, PE and Mach-O binary analyzer
- Strings extractor for binaries and blobs
- Python .pyc bytecode disassembler
- Java .class disassembler
- WebAssembly disassembler
New to this? Read Reverse engineering, Mobile applications, Firmware, hardware and signals, Smart contracts and the EVM
Crypto
Have the cipher identifier open on the first paste. Most of the round-one crypto is a classical cipher or an RSA parameter mistake, and both are recognised faster than they are solved.
- Cipher identifier and automatic decoder
- RSA decryption and attack runner
- XOR cipher decoder and key recovery
- Vigenere cipher solver with automatic key recovery
- Modular arithmetic and number theory toolkit
New to this? Read Classical ciphers and frequency analysis, XOR and the cost of reusing a key, Block ciphers, modes and oracles, RSA and the parameters that break it, Discrete logs, Diffie-Hellman and elliptic curves
Forensics
Start with the file's own claim about itself, then with what is appended after it ends. Both are one paste away.
- File type identifier by magic bytes
- Hex viewer and hexdump
- ZIP archive inspector
- PCAP analyzer for CTF network forensics
- Memory dump, disk image and registry hive analysis
New to this? Read File forensics and carving, Network forensics, Memory and disk forensics, Malware triage and defensive telemetry
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.
- CredVaultrev · 2026 · 4 writeups
- Kantrev · 2026 · 3 writeups
- nullshuipwn · 2026 · 3 writeups
- Whiskerfield-Meowtincrypto · 2026 · 3 writeups
- WinCapturepwn · 2026 · 3 writeups
- dual_lineracrypto · 2026 · 2 writeups