BSidesSF 2025 CTF
52 challenges with 20 published community solutions between them. Solution links go to CTFtime’s task page, which aggregates every writeup for a challenge - individual blog posts rot, the aggregator does not. 48 of them also carry the solution BSidesSF 2025 CTF’s own organisers published, which is linked on the challenge itself.
Full task list on CTFtimeUncategorised51
The upstream scoreboard did not say, so neither do we.
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/100_moduli.txt, solution/all_prime_pats.txt, solution/gcd_mods.py, solution/generate_all_pattern_primes.py, solution/getkey.txt, solution/trial_coppersmith.sage, solution/trial_division.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/aes_cmac.py, solution/build_forged_blob.py, solution/print_flag.asm
Published by the organisers in BSidesSF/ctf-2025-release: solution/dragonfile.txt, solution/libronsolve.rb, solution/shellcode.asm, solution/solve.rb
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve.rb
Also written up in: d01ki/CTF-Writeup, d01ki/CTF-Writeup
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve.rb
Also written up in: d01ki/CTF-Writeup, d01ki/CTF-Writeup
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/print_flag.py, solution/solution.py, solution/storeFlag.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/payload.js, solution/serveIt.py, solution/solution.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve.rb
Also written up in: d01ki/CTF-Writeup, d01ki/CTF-Writeup
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/shellcode.asm, solution/solve.rb
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve.rb
Also written up in: d01ki/CTF-Writeup
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve-internal.rb, solution/solve.rb
Published by the organisers in BSidesSF/ctf-2025-release: solution/exploit_script.rb, solution/libronsolve.rb, solution/solve.rb
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/solution.py
Also written up in: d01ki/CTF-Writeup
Published by the organisers in BSidesSF/ctf-2025-release: solution/solve.rb
Also written up in: d01ki/CTF-Writeup, d01ki/CTF-Writeup
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/invert_model.py, solution/model_summary.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/solution.txt, solution/r16_extract_hidden_data.py, solution/r16_to_ppm.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve.rb
Also written up in: d01ki/CTF-Writeup
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/solution.py, solution/solver.js
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md
Also written up in: d01ki/CTF-Writeup, d01ki/CTF-Writeup
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/md5_brent.c
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/decode_blocks.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/solve.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/dec_cbc.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve.rb
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve.rb
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve.rb
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/solve_search.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md
Also written up in: d01ki/CTF-Writeup
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/solution.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/solution.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve.rb
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md
Also written up in: d01ki/CTF-Writeup
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve.rb
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md, solution/jpeg_uncrop.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve.rb
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md
Published by the organisers in BSidesSF/ctf-2025-release: solution/solution.txt
Published by the organisers in BSidesSF/ctf-2025-release: solution/solve.py
Published by the organisers in BSidesSF/ctf-2025-release: solution/solution.txt
Memo Decrypted
1 official solutionAlso written up in: d01ki/CTF-Writeup
Also written up in: d01ki/CTF-Writeup
Meow Your Browser Hates You
1 official solutionAlso written up in: isip-hs-whoami/CTF-writeup
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md
Published by the organisers in BSidesSF/ctf-2025-release: solution/README.md
Toothless Hangman One
1 official solutionAlso written up in: isip-hs-whoami/CTF-writeup
Reverse engineering1
Work out what a compiled program does without its source, then work backwards from the check to the input that passes it.
Published by the organisers in BSidesSF/ctf-2025-release: solution/libronsolve.rb, solution/solve.rb
- re
Same technique in picoCTF: Checkpass, WinAntiDbg0x100, WinAntiDbg0x200