Internal Selection CTF 2025
23 challenges with 28 published solutions between them. The writeups for this event were found in public repositories. Each link is pinned to the commit it was read from.
Where these writeups liveUncategorised13
The upstream scoreboard did not say, so neither do we.
Atadatem
1 official solutionAlso written up in: riyanda-s/ctf-writeups
Blind file
1 official solutionAlso written up in: riyanda-s/ctf-writeups
Check Disasm
1 official solutionAlso written up in: riyanda-s/ctf-writeups
Check It Out
1 official solutionAlso written up in: riyanda-s/ctf-writeups
Day 1
1 official solutionAlso written up in: riyanda-s/ctf-writeups
I Forgot Something
1 official solutionAlso written up in: riyanda-s/ctf-writeups
LeFI Gimang
1 official solutionAlso written up in: riyanda-s/ctf-writeups
Lockpicking
1 official solutionAlso written up in: riyanda-s/ctf-writeups
My Networ(th)k
1 official solutionAlso written up in: riyanda-s/ctf-writeups
Strings
1 official solutionAlso written up in: riyanda-s/ctf-writeups
Upload(1)
1 official solutionAlso written up in: riyanda-s/ctf-writeups
Upload(4)
1 official solutionAlso written up in: riyanda-s/ctf-writeups
WASM (Weird Assembly)
1 official solutionAlso written up in: riyanda-s/ctf-writeups
Cryptography6
Recover a plaintext or a key from something that was supposed to protect it. In practice: identify the scheme, find the parameter the author got wrong, exploit it.
Based
2 official solutionsAlso written up in: riyanda-s/ctf-writeups, riyanda-s/ctf-writeups
Also written up in: riyanda-s/ctf-writeups, riyanda-s/ctf-writeups
Nothing
2 official solutionsAlso written up in: riyanda-s/ctf-writeups, riyanda-s/ctf-writeups
Square
2 official solutionsAlso written up in: riyanda-s/ctf-writeups, riyanda-s/ctf-writeups
Also written up in: riyanda-s/ctf-writeups, riyanda-s/ctf-writeups
Also written up in: riyanda-s/ctf-writeups
OSINT4
Answer a question about the real world from public sources. The work is pivoting between identifiers, not exploiting anything.
Guessr 1
1 official solutionAlso written up in: riyanda-s/ctf-writeups
Guessr 2
1 official solutionAlso written up in: riyanda-s/ctf-writeups
Guessr 3
1 official solutionAlso written up in: riyanda-s/ctf-writeups
Raja Renov
1 official solutionAlso written up in: riyanda-s/ctf-writeups