$ 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

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Challenge CTF Weight Has
string-cheese
#hardcoded-comparison
 LA 2023 – files wu 3
babyrev
#ghidra-static-analysis
 corCTF 2021 24.92 files wu 3
ctfd-plus
#gdb-register-extraction
 LA 2023 – files wu 3
Sakura
#fuzzing
 LINE 2021 – files wu 3
warmup-rev
#function-inversion
 HSCTF 2021 – files src wu 3
CSS_Password
#css#logic-reconstruction
 UofTCTF 2024 23.90 files wu 3
infinite-free-trial
#crc8#bruteforce#keygen
 RaRCTF 2021 24.53 files wu 3
Classic_Checkers
#constraint-solving#lisp
 BlueHens 2023 24.61 files wu 3
shattered_memories
#constraint-reconstruction
 LA 2024 – files wu 3
swirler
#client-side-js#image-unswirl#qr-recovery
 b01lers 2021 22.99 files wu 3
BF_means_best_friend_right
#brainfuck
 HackPack 2021 24.31 files wu 3
RaRPG
#binary-patching
 RaRCTF 2021 24.53 files wu 3
TooMuch
#angr#symbolic-execution
 darkCON 2021 24.06 files wu 3
babymix
#angr#symbolic-execution
 DiceCTF 2021 24.82 files wu 3
ChargeTracker
#android-apk-reversing
 BSidesSF 2021 23.94 files wu 3
Misbehave TSG 2024 – files wu 3
Relay HKUSTFirebird 2024 – files wu 3
Rune_Whats_that IrisCTF 2024 24.59 files wu 3
TSGDBinary TSG 2024 – files wu 3
The_Johnsons IrisCTF 2024 24.59 files wu 3
Warmup_SQLite TSG 2024 – files wu 3
serverless TSG 2024 – files wu 3
the_encoder KnightCTF 2022 17.38 files wu 3
Acrylic TAMUctf 2021 – files wu 3
HackerManifesto Tenable 2021 22.37 files wu 3
K3RN3L_DROID K3RN3LCTF 2021 24.37 files wu 3
Passcode eHaCON 2021 – files wu 3
PeebPoob UTCTF 2021 – files wu 3
Tedious UIUCTF 2021 – files wu 3
chains UMassCTF 2021 23.56 files wu 3
no-debug TrollCAT 2021 21.87 files wu 3
seed DamCTF 2021 24.43 files wu 3
signals UIUCTF 2021 – files wu 3
verybabyrev RaRCTF 2021 24.53 files wu 3
you_wa_shockwave PlaidCTF 2020 93.15 files wu 3
Zabomb
#zip-bomb
 K3RN3LCTF 2021 24.37 files wu 2
FlagChecker
#z3-constraint-solving#rust-reversing
 1337UP 2023 24.23 files wu 2
Random_Maze
#z3#constraint-solving
 UofTCTF 2024 23.90 files wu 2
Jumprope
#xor-keystream
 ImaginaryCTF 2021 – files wu 2
Storytime_The_Tragic_Interlude
#xor-decryption
 BCACTF 2021 – files wu 2