$ ctf42

Reverse CTF challenges

4,044 Reverse CTF challenges from 397 CTFs (2011–2026), 511 with writeups.

Top reverse techniques

#reversing 77 #xor 24 #z3 15 #vm-reversing 13 #constraint-solving 10 #static-analysis 9 #strings 9 #android 9 #anti-debugging 7 #symbolic-execution 6 #dotnet-reversing 6 #xor-cipher 5 #angr 5 #windows-reversing 5 #binary-patching 5

Challenges

Filter and sort these in the challenge browser →

Challenge CTF Weight Has
Cr4ck_3 LYKNCTF 2026 – files
Crack_Me_Vault BDSec 2026 15.62 files
Crypto_Wallet FortID 2026 45.00 files
Crystal_Clear DUCKERZ 2026 – files
Cubism FortID 2026 45.00 files
Cyber_Saiyan FromDuskTillDawn 2026 Quals 20.14 files
Dantes_Trial Srdnlen 2026 Quals 34.76 files
Deadwater RITSEC 2026 – files
DebugMe HASBLCTF 2026 – files
Decompile BrunnerCTF 2026 24.66 files
Diabolical ScriptCTF 2026 – files
Digger_Dug BKCTF 2026 – files
Do_you_know_the_way DalCTF 2026 24.90 files
Draw_Me ApoorvCTF 2026 24.10 files
Drippy_Adventures L3akCTF 2026 34.47 files
Duckrave DUCKERZ 2026 – files
Ducks_Ping_Pong_Revenge V1T 2026 22.14 files
Dust_to_Dust DawgCTF 2026 66.64 files
E4sy_P3asy KnightCTF 2026 22.21 files
EASY_supercool BKCTF 2026 – files
Ehlel Haruulzangi 2026 Quals – files
El_Diablo BITSCTF 2026 – files
Enc V1T 2026 22.14 files
Encrypt Securinets 2026 Quals 85.12 files
Entropy_Core THEMCTF 2026 – files
Ett_till_pajat_fonster Undutmaning 2026 33.00 files
Evilgram K17 2026 24.83 files
Exit_Interview E0F 2026 25.00 files
Explore._Build._Survive TaipanByte 2026 – files
FCP BreakTheSyntax 2026 56.25 files
FLAPPY_BOARD CSS 2026 – files
Favorite_Potato b01lers 2026 66.00 files
Finger_Arithmetic TraceBash 2026 25.00 files
Flag_Pointer_Register NNS 2026 – files
Flag_Transfer_Protocol LagNCrash 2026 25.00 files
FlameOn SunshineCTF 2026 51.63 files
Fllllllag_ch3cker_again THJCC 2026 – files
Forges_......._well_forge ApoorvCTF 2026 24.10 files
Four_Registers BDSec 2026 15.62 files
Franklin BoroCTF 2026 – files