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picoCTF Solutions - Free CTF Writeups and Solutions

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356 step-by-step writeups with commands, explanations, and flags spanning every event from 2019 through 2026.

picoCTF 2026

Binary DigitsForensics
bytemancy 0General Skills
bytemancy 1General Skills
MultiCodeGeneral Skills
MY GITGeneral Skills
Old SessionsWeb Exploitation
Password ProfilerGeneral Skills
Piece by PieceGeneral Skills
ping-cmdGeneral Skills
Printer SharesGeneral Skills
QuizploitBinary Exploitation
Shared SecretsCryptography
StegoRSACryptography
SUDO MAKE ME A SANDWICHGeneral Skills
UndoGeneral Skills
ABSOLUTE NANOGeneral Skills
Access_ControlBlockchain
Autorev 1Reverse Engineering
Black Cobra PepperCryptography
Bypass MeReverse Engineering
bytemancy 2General Skills
bytemancy 3General Skills
ClusterRSACryptography
Credential StuffingWeb Exploitation
cryptomazeCryptography
DISKO 4Forensics
Echo Escape 1Binary Exploitation
Echo Escape 2Binary Exploitation
Failure FailureGeneral Skills
Fool the LockoutWeb Exploitation
Forensics Git 0Forensics
Forensics Git 1Forensics
Forensics Git 2Forensics
GatekeeperReverse Engineering
HashgateWeb Exploitation
Hidden Cipher 1Reverse Engineering
Hidden Cipher 2Reverse Engineering
KSECRETSGeneral Skills
No FAWeb Exploitation
North-SouthWeb Exploitation
Not TRUeCryptography
offset-cycleBinary Exploitation
Related MessagesCryptography
Rogue TowerForensics
Secret BoxWeb Exploitation
Secure Password DatabaseReverse Engineering
shift registersCryptography
Silent StreamReverse Engineering
Small TroubleCryptography
Smart_OverflowBlockchain
Sql Map1Web Exploitation
tea-cashBinary Exploitation
The Add/On TrapReverse Engineering
Timeline 0Forensics
Timeline 1Forensics
Timestamped SecretsCryptography
Binary Instrumentation 3Reverse Engineering
Binary Instrumentation 4Reverse Engineering
Front_RunningBlockchain
Heap HavocBinary Exploitation
JITFPReverse Engineering
MSS_ADVANCE RevengeCryptography
offset-cycleV2Binary Exploitation
ORDER ORDERWeb Exploitation
paper-2Web Exploitation
Pizza RouterBinary Exploitation
Printer Shares 2General Skills
Printer Shares 3General Skills
ReentranceBlockchain
Secure Dot ProductCryptography

picoCTF 2025

Cookie Monster Secret RecipeWeb Exploitation
EVEN RSA CAN BE BROKEN???Cryptography
FANTASY CTFGeneral Skills
Flag HuntersReverse Engineering
hashcrackCryptography
head-dumpWeb Exploitation
n0s4n1ty 1Web Exploitation
Ph4nt0m 1ntrud3rForensics
PIE TIMEBinary Exploitation
REDForensics
Rust fixme 1General Skills
Rust fixme 2General Skills
Rust fixme 3General Skills
SSTI1Web Exploitation
3v@lWeb Exploitation
Apriti sesamoWeb Exploitation
Binary Instrumentation 1Reverse Engineering
Binary Instrumentation 2Reverse Engineering
Bitlocker-1Forensics
Bitlocker-2Forensics
ChronohackReverse Engineering
Echo ValleyBinary Exploitation
Event-ViewingForensics
flags are stepicForensics
Guess My Cheese (Part 1)Cryptography
Guess My Cheese (Part 2)Cryptography
hash-only-1Binary Exploitation
hash-only-2Binary Exploitation
PachinkoWeb Exploitation
perplexedReverse Engineering
PIE TIME 2Binary Exploitation
Quantum ScramblerReverse Engineering
SSTI2Web Exploitation
Tap into HashReverse Engineering
WebSockFishWeb Exploitation
YaraRules0x100General Skills
ChaCha SlideCryptography
handoffBinary Exploitation
Pachinko RevisitedWeb Exploitation
RicochetCryptography
secure-email-serviceWeb Exploitation

picoCTF 2024

Binary SearchGeneral Skills
binhexaGeneral Skills
Blame GameGeneral Skills
BookmarkletWeb Exploitation
CanYouSeeForensics
Collaborative DevelopmentGeneral Skills
Commitment IssuesGeneral Skills
endiannessGeneral Skills
format string 0Binary Exploitation
heap 0Binary Exploitation
interencdecCryptography
IntroToBurpWeb Exploitation
Scan SurpriseForensics
Secret of the PolyglotForensics
Super SSHGeneral Skills
Time MachineGeneral Skills
UnminifyWeb Exploitation
VerifyForensics
WebDecodeWeb Exploitation
Blast from the pastForensics
C3Cryptography
Classic Crackme 0x100Reverse Engineering
Custom encryptionCryptography
Dear DiaryForensics
dont-you-love-bannersGeneral Skills
endianness-v2Forensics
FactCheckReverse Engineering
format string 1Binary Exploitation
format string 2Binary Exploitation
heap 1Binary Exploitation
heap 2Binary Exploitation
heap 3Binary Exploitation
Mob psychoForensics
No Sql InjectionWeb Exploitation
packerReverse Engineering
rsa_oracleCryptography
SansAlphaGeneral Skills
TricksterWeb Exploitation
weirdSnakeReverse Engineering
WinAntiDbg0x100Reverse Engineering

picoCTF 2023

repetitionsGeneral Skills
babygame01Binary Exploitation
chronoGeneral Skills
FindAndOpenForensics
findmeWeb Exploitation
hidemeForensics
HideToSeeCryptography
MatchTheRegexWeb Exploitation
More SQLiWeb Exploitation
MSBForensics
PcapPoisoningForensics
PermissionsGeneral Skills
ReadMyCertCryptography
Ready Gladiator 0Reverse Engineering
Ready Gladiator 1Reverse Engineering
Ready Gladiator 2Reverse Engineering
ReverseReverse Engineering
rotationCryptography
Safe Opener 2Reverse Engineering
SOAPWeb Exploitation
SpecialGeneral Skills
SpecialerGeneral Skills
timerReverse Engineering
two-sumBinary Exploitation
uselessGeneral Skills
UnforgottenBitsForensics

picoCTF 2022

IncludesWeb Exploitation
Inspect HTMLWeb Exploitation
Local AuthorityWeb Exploitation
basic-mod1Cryptography
basic-mod2Cryptography
bloat.pyReverse Engineering
credstuffCryptography
CVE-XXXX-XXXXBinary Exploitation
EavesdropForensics
Enhance!Forensics
File typesForensics
file-run1Reverse Engineering
file-run2Reverse Engineering
Forbidden PathsWeb Exploitation
Fresh JavaReverse Engineering
GDB Test DriveReverse Engineering
Lookey hereForensics
morse-codeCryptography
Operation OniForensics
Operation OrchidForensics
Packets PrimerForensics
patchme.pyReverse Engineering
Power CookieWeb Exploitation
rail-fenceCryptography
Redaction gone wrongForensics
Roboto SansWeb Exploitation
Safe OpenerReverse Engineering
Search sourceWeb Exploitation
SecretsWeb Exploitation
Sleuthkit ApprenticeForensics
Sleuthkit IntroForensics
SQL DirectWeb Exploitation
St3g0Forensics
substitution0Cryptography
substitution1Cryptography
substitution2Cryptography
Torrent AnalyzeForensics
transposition-trialCryptography
unpackme.pyReverse Engineering
VigenereCryptography
SideChannelForensics

picoCTF 2021

CookiesWeb Exploitation
GET aHEADWeb Exploitation
InformationForensics
Magikarp Ground MissionGeneral Skills
Mod 26Cryptography
Nice netcat...General Skills
Obedient CatGeneral Skills
Scavenger HuntWeb Exploitation
Static ain't always noiseGeneral Skills
Tab, Tab, AttackGeneral Skills
TransformationReverse Engineering
Wave a FlagGeneral Skills
ARMssembly 0Reverse Engineering
ARMssembly 1Reverse Engineering
crackme-pyReverse Engineering
Dachshund AttacksCryptography
Disk, disk, sleuth!Forensics
Disk, disk, sleuth! IIForensics
Easy PeasyCryptography
It is my BirthdayWeb Exploitation
keygenme-pyReverse Engineering
MacroHard WeakEdgeForensics
Matryoshka dollForensics
Mind your Ps and QsCryptography
Mini RSACryptography
Most CookiesWeb Exploitation
New CaesarCryptography
No Padding, No ProblemCryptography
PixelatedCryptography
Python WranglingGeneral Skills
ShopReverse Engineering
Some Assembly Required 1Web Exploitation
speeds and feedsReverse Engineering
StonksBinary Exploitation
Super SerialWeb Exploitation
Trivial Flag Transfer ProtocolForensics
tunn3l v1s10nForensics
Who are you?Web Exploitation
Wireshark doo dooo do doo...Forensics
ARMssembly 2Reverse Engineering
Cache Me OutsideBinary Exploitation
Play NiceCryptography
Unsubscriptions Are FreeBinary Exploitation

picoCTF 2020 Mini-Competition

Guessing Game 1Binary Exploitation
Pitter, Patter, PlattersForensics
Web GauntletWeb Exploitation
Guessing Game 2Binary Exploitation
OTP ImplementationReverse Engineering

picoCTF 2019

Beginner picoMini 2022

CodebookGeneral Skills
convertme.pyGeneral Skills
fixme1.pyGeneral Skills
fixme2.pyGeneral Skills
Glitch CatGeneral Skills
HashingJobAppGeneral Skills
ncmeGeneral Skills
PW Crack 1General Skills
PW Crack 2General Skills
runme.pyGeneral Skills
PW Crack 3General Skills
PW Crack 4General Skills
PW Crack 5General Skills
SerpentineGeneral Skills

picoMini by CMU-Africa

Corrupted fileForensics
Crack the Gate 1Web Exploitation
Flag in FlameForensics
Hidden in plainsightForensics
Log HuntGeneral Skills
Riddle RegistryForensics
byp4ss3dWeb Exploitation
Crack the Gate 2Web Exploitation
Crack the PowerCryptography
Input Injection 1Binary Exploitation
Input Injection 2Binary Exploitation
M1n10n'5_53cr37Reverse Engineering
Pico BankReverse Engineering

picoMini by redpwn

advanced-potion-makingForensics
caasWeb Exploitation
clutter-overflowBinary Exploitation
loginWeb Exploitation
spelling-quizCryptography
not cryptoReverse Engineering
notepadWeb Exploitation
scrambled-bytesForensics
triple-secureCryptography
XtraORdinaryCryptography

picoGym Exclusive

Big ZipGeneral Skills
DISKO 1Forensics
First FindGeneral Skills
ASCII FTWReverse Engineering
ASCII NumbersGeneral Skills
Bit-O-Asm-1Reverse Engineering
Bit-O-Asm-2Reverse Engineering
Bit-O-Asm-3Reverse Engineering
Bit-O-Asm-4Reverse Engineering
DISKO 2Forensics
DISKO 3Forensics
GDB baby step 1Reverse Engineering
GDB baby step 2Reverse Engineering
GDB baby step 3Reverse Engineering
GDB baby step 4Reverse Engineering
JAuthWeb Exploitation
Local TargetBinary Exploitation
Picker IReverse Engineering
Picker IIReverse Engineering
Picker IIIReverse Engineering
Picker IVBinary Exploitation
WPA-ing OutForensics

© 2026 picoCTF Solutions