# Nullcon Berlin HackIM 2025 CTF

Link: [https://ctf.nullcon.net/](<https://ctf.nullcon.net/>)

CTFTime: [https://ctftime.org/event/2874](<https://ctftime.org/event/2874>)

Result: 2599 Points, 34th Place

Solved Challenges:

Misc:

- [Null Sanity](<https://jia.je/ctf-writeups/2025-09-04-nullcon-berlin-hackim-2025-ctf/null-sanity.html>)
- [usbstorage](<https://jia.je/ctf-writeups/2025-09-04-nullcon-berlin-hackim-2025-ctf/usbstorage.html>)

Web:

- [grandmas\_notes](<https://jia.je/ctf-writeups/2025-09-04-nullcon-berlin-hackim-2025-ctf/grandmas-notes.html>)
- [pwgen](<https://jia.je/ctf-writeups/2025-09-04-nullcon-berlin-hackim-2025-ctf/pwgen.html>)
- [webby](<https://jia.je/ctf-writeups/2025-09-04-nullcon-berlin-hackim-2025-ctf/webby.html>)

Crypto:

- [Power tower](<https://jia.je/ctf-writeups/2025-09-04-nullcon-berlin-hackim-2025-ctf/power-tower.html>)
- [Simple ECDSA](<https://jia.je/ctf-writeups/2025-09-04-nullcon-berlin-hackim-2025-ctf/simple-ecdsa.html>)
- [decryption execution service](<https://jia.je/ctf-writeups/2025-09-04-nullcon-berlin-hackim-2025-ctf/decryption-execution-service.html>)
- [Field trip](<https://jia.je/ctf-writeups/2025-09-04-nullcon-berlin-hackim-2025-ctf/field-trip.html>)
- [Magnetic tape](<https://jia.je/ctf-writeups/2025-09-04-nullcon-berlin-hackim-2025-ctf/magntic-tape.html>)
- [Narrow DES](<https://jia.je/ctf-writeups/2025-09-04-nullcon-berlin-hackim-2025-ctf/narrow-des.html>)

Reverse:

- [hidden\_strings](<https://jia.je/ctf-writeups/2025-09-04-nullcon-berlin-hackim-2025-ctf/hidden-strings.html>)

Pwn:

- [Fortispy 1 solved by @Rosayxy](<https://rosayxy.github.io/pwning-thru-the-night/>)

Solved after the competitions:

- [All Fortispy pwn challenges solved by @Rosayxy](<https://rosayxy.github.io/pwning-thru-the-night/>)