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darkCON
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DCTF
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DeadSec
DeconstruCT.F
Defcamp
DEFCON
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DUCKERZ
E0F
EBCTF
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ECW
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EHAX
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Engineer
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EvlzCTF
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FromDuskTillDawn
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FwordCTF
GACTF
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GCC
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Ghost in the Shellcode
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GLSC
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GPN
GreHack CTF
GREP
GreyCatTheFlag
h4ckc0n
H7CTF
Hack.lu
Hackappatoi
HackASat
HackAstra
HackCon
HackersPlayground
HackForAChange
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Hackorn
Hackover
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HackZoneTunisia
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HKUSTFirebird
HSCTF
hxp
ICHSA
idekCTF
IERAE
IJCTF
ImaginaryCTF
IMF
INCOGNITO
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Infobahn
InfoSec
IngonyamaZK
INShAck
insomnihack
Intent
InterlogicaCTFs
InternetFestival
involuntaryCTF
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IRON
ISITDTU
Jade
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justCTF
K17
K3RN3LCTF
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Kashi
KBxAc
KillerQueen
Kind4SUS
KipodAfterFree
KITCTFCTF
kksctf
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LA
LagNCrash
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LINE
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MUST
n00bzCTF
N0PSctf
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NCTF
NDIASAutomotiveIoT
NeverLAN CTF
NewportBlakeCTF
NewYear
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niteCTF
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NoHackNoCTF
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NTUA_H4CK
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nullconHackIM
OFPPT
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openECSC
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osuigaming
OverTheWireAdventBonanza
P.W.N
P3rf3ctr00t
p4ctf
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PBjar
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perfectblue
picoCTF
pingCTF
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plfanzen
PointerOverflow
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Pwn2Win
PwnMe
PwnSec
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redpwn
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SAS
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SecLeaf
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SecurityFest
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SHELL
ShunyaCTF
SillyCTF
sknbCTF
smileyCTF
snakeCTF
SpaceHeroes
SpamAndFlags
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SpringForwardCTF
squ1rrel
Srdnlen
StackSmash
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Starpwn
Summit
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SuSeC
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SyskronSecurity
T3N4CI0US
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TallDwarfHostingHostingTakeover
Tamil
TAMUctf
Tasteless
TCP1P
TeamItaly
TECHCOMFEST
Tenable
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TexSAW
TFC
TGHACK
THCon
TheCyberJawaraInternational
TheHackerConclave
THEMCTF
TheOdyssey
THJCC
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tkbctf
TMUCTF
ToH
TokyoWesterns
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TraceAthenaOSINT
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TrellixHAX
TrollCAT
TRX
TSCCTF
TSG
TsukuCTF
TU
TyphoonCon
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UACWS
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Ugra
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UNbreakableInternational
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vsCTF
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Wargames.MY
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watevrCTF
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WHY
Winja
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WorldWide
WORMCON
WPICTF
WRECKCTF
wtf
WxMCTF
X-MAS
x3ctf
XCTF-DubheCTF
Z0d1ak
zer0pts
Zh3r0
$N1PH€RS CTF
*ctf
0ByteCTF
0x00ctf
3DSCTF
404 CTF
44CON CTF
8bit
9447 Security Society CTF
@Hack
@HackCTF
A Renewal Agent
ABCTF
AceBear Security Contest
ACECTF
ACS(ASEAN Cyber Shield) CTF
Affinity CTF
AI vs Human CTF
airgapctf2020
Ajman University CTF
AlexCTF
Alfa CTF
ALICTF
ALL.MN CTF
AltayCTF
AMSI CTF
Anti-Slop CTF
APAIUT-CERT Quals
Aperi'CTF
APort Vault CTF
April Fools' GTF
ASCF CTF
ATAST CTF
Athena CTF
ATLA Opening Date CTF
Automotive CTF Japan
AvitoTech CTF
AVSS (Adversarial Vulnerability Scoring System) Contest
B-Sides
BACCC Regionals
BaltCTF
BaltCTF Quals
Bambi CTF
Bank Security Challenge
BATTLEWARE
BauCTF
BCS CTF
BelkaCTF
Belluminar
Biterra CTFs
BlackAlps
Bloom Clues CTF
BOOT 2 ROOT(CTF)
Boston Key Party CTF
BrainHack
Breach Bytes 2.0
Breach Point CTF
BreachPoint
Break In
BSides Ahmedabad CTF
Bsides Jeddah
BSides Odisha WEB3 CTF
BSides Peoria CTF
BTH_CTF
BUET CTF
BUFF3R CTF
Bugs Bunny CTF
ByteMe CTF
C4CTF
Can-CWIC CTF
Capture Point
Capture the Flag - Incredia
Capture the Signal CTF
Capture The TI_eRx
CaptureTheFIC
CaptureTheWU
Carthage Cyber Arena
CAT Reloaded CTF
CBIT Headstart CTF
CBM CTF
CCTF
CDCTF
Challenge the Cyber
CIC_CTF
CInsects CTF
CipherHunt
CipherHunt 2.0
CISA ICS CTF
CITEFLAG
CityF atBash
Clash of Cybers
Code X Sport Jung'23 CTF
Codean CTF
Cohesion
Collegiate SECTF
Conquer the World by IEEE-VIT
Content Creators Club CTF
Covid-19 CTF
CRAC CTFs
CRACK-IN 2.0
CREST CTF
CRMA mini CTF
CrypT_Find
CryptixCTF
CryptoBurst CTF
CS166 x FSAB CTF
CSA CTF
CSAW Embedded Security Challenge Quals
CSCAMP CTF Finals
CSCAMP CTF Quals
CSCTF
CTF 313
CTF After Dark
CTF Cybercamp UMU
CTF InterIUT
CTF Internacional MetaRed
CTF Russian Cup
CTF(x)
ctf.moscow
CU school CTF
CUCTF
CYBER
Cyber Community Club
Cyber conclave | KI CTF
Cyber Jawara
Cyber Lumen #CTF
Cyber@Hack
CyberBytes
CyberCup Indian Ocean
CyberHackCTF
CyberHavoc
CyberKumbez
CyberNSK
CyberQuest
CyberSci
Cybersecurity Day
CyberSphere CTF
CyberTalents CTF
CyberTalents CTFs
CyberThreatForce-CTF
CypHer CTF
DASCTF
DataCon
DC509 CTF
DECIPHER CTF
Decompetition
Defcon Cloud Village CTF
DEFKTHON CTF
Deloitte CTF
DerbyCon
DHM
Dialed Up CTF
Die Abenteuer von KIM & TIM
Digital Forensics Challenge by DFIR Labs
DIMVA CTF
DomeCTF
DoubleS1405 CTF
Dz-Hack-Event
e-Jornadas
easterpwn
EasyCTF
eCrimeCTF
EMC Defenders League Quals
EncipherX CTF
ENCRYPT CTF
EnigmaXplore 2.0
ENOWARS
EPIHACK CTF
Equinor CTF
Esaip CTF
Eschaton CTF
Espilon CTF
Ethernaut CTF
EYCC CTF
EyesOpenCTF
Facebook security hacker competition
FarEastCTF
Fartfire
FAUST CTF
FIT-HACK CTF
Flagyard - HITB SecConf Bangkok
FlightPath
Fluid Attacks CTF
FMCTF
ForbiddenBITS CTF
Fweefwop CTF
g0s CTF
GaianSpace CTF
Game of Pwners
GEEK CTF
Geekpwn x Tencent YDLAB Cloud Range Challenge
GirlsGoCyberStart
GITEX GLOBAL CTF
GITxIITB TL CTF
Global CyberPeace Challenge
GoIda CTF
Goldrush Gauntlet
GooseCTF
GREP CTF 2.0
Ground Zero- Hackathon- CTF, Siliguri
gryphCTF
Guardians of the TI
Guinean Cyber Security Challenge
GunnHacks
h1702ctf
h34dCTF
H4ckIT CTF
Hack a Bit
Hack For Troops
HACK KAP CTF
Hack The Nexus - Blizzard CTF
Hack Zeugma
Hack'In
HACK'OSINTCTF
Hack2Dawn CTF
Hack4Krak
HackDay CTF
HackDayCTF
Hacker's Gambit
Hackfest
Hackfest CTF
HackHowl
HackIT CTF
hackrocks Cyber Summer Camp
HackTheDrone CTF
HACKTHEON SEJONG
HacktorX CTF
Hacktrick CTF
Hackvens
Hacky Holidays
Hackअस्त्र CTF Qualifiers
HACON_CTF
Hardware CTF at hardwear.io Netherlands
hardwear.io CTF
HCTF
HI Cyber Con CTF
HICAThon 1.0
HITB Amsterdam Pro CTF
HITB CTF Amsterdam
HITB LOCKDOWN CTF
HITB PRO CTF
HITB SECCONF CTF
HITB-XCTF
HitbSecConf CTF (Kuala Lumpur)
HITCON Cyber Range
HKCTF Open Semi-Final
Hospital Under Siege CTF
HSCSEC
HSE CTF
HTBLuVA Villach CTF
HumanCTF
HUNTING SEASON: GROUP-IB 20TH ANNIVERSARY CTF
HUST Hacking Festival
IBST.PSU CTF
ICCSDFAI CTF
IceCTF
ICG CTF
ICON CTF
iCTF
IDEH
if(is) - CTF
IFIP SEC Capture-the-Flag
IHS CTF
Imperial CTF
Inc0gnito CTF
Inferno CTF
InfiniteCTF
InIt CTF
InnoCTF
InnoCTF International
InnoGames CTF
Insigne CTF
INTECHFEST
Internetwache CTF
Intigriti Monthly Challenges
Iran Tech Olympics CTF
ISFCR CTF
ISSessions Espionage CTF
IWCON CTF
İGÜCTF
Jeanne d'Hack CTF
JISCTF
JUCTF
Jule CTF
Juniors CTF
K!nd4SUS CTF
KAALCHAKRA CTF
Kaizen arabia CTF
Kali Team - CTF
Kaspersky Industrial CTF Finals
KasperskyCTF
Kernel Kombat
Kettle CTF
Kiwi CTF
KrasCTF
L3m0n CTF
LabyREnth
Laokoon Security CTF
LASACTF
LBC2
LinuxMeetup
LiU CTF
LKLCTF
Lockett Vesp Range
LowLandMink's CTF
Lun4R CTF
LyonCTF
MAGIC
MalCon CTF
Maltego Community OSINT CTF
Mars@hack
Metared Argentina
Metasploit community CTF
MetaTrust Web3 Security CTF Competition
mHackeCTF
MHSCTF
Mimic
MindBreak
MireaCTF
MIT/LL CTF
MITCTF
MITRE eCTF
MLSC Capture The Flag
MOCA - Metro Olografix - CTF
Moroccan Cyber Security Camp
Moscow CTF School
Mozilla CTF
MythX: An Endgame Protocol CTF
Narxoz CTF
NaSCon CTF
Newark Academy CTF
Newbie CTF(N-CTF)
NileCTF 2026
No cON Name CTF Finals
No cON Name CTF Quals
No Hat CTF
NoNameCon CTF
Nordic IT Security Hackathon
NorthSec CTF
NotSoSecure CTF
noxCTF
NSK CTF
NSSCTF
Null Origin
Olympic CTF
OmCTF
OmniCTF
OmWars CTF
OpenCTF
Operation Cipher Shadows
ostctf
osu!gaming CTF
OtterCTF
Outback Overflow
OWASL-IL CTF
OWASP CTF
Pacific Hackers CTF
PACTF
PASECA CTF
peaCTF
PECAN+ CTF
Peng Cheng – Macau Federation Cybersecurity Range Competition
PermCTF
PH03N1X V1P3R N0V4 CTF
ph0wn
Phantom CTF
PHD CTF Finals
PHD CTF Quals
PINK+ CTF
PlayCyber
PoliCTF
PolyPwnCTF
Potsdam Cyber Games
Power Of Community - POC CTF
Power of XX
Procom CTF
PSUT
Punk Security DevSecOps birthday CTF
PUTCyberDays CTF
Pwn2Play Open CTF
Pwnium CTF
PwnTillDawn CTF
PwnverseCTF
Pàlcam CyberGames
Qiangwang Challenge on Cyber Mimic Defense
QIWI CTF
r2con CTF
RADARCTF
Radio Activity CTF
RamadanCTF
Rams CTF
RatCTF
Razer CTF
Really Awesome CTF
RED CTF
Red Team Lounge CTF
Redfox CTF
REDHACK
RedTeam
Reply CTF Challenge
Republic of Cyber Sentinals
RESTCON CTF
riceteacatpanda
riftCTF
Riscure Hack me CTF
RoboHack AI CTF
RomHackCTF
RootedCON
RPCA CTF
RSTCON CTF
RuCTF
RuCTF Finals
RuCTF Quals
RundergroundCTF
RUSecure-CTF
Russian CTF Cup
Ruxcon CTF
rwthCTF
saarCTF
Sacramentum
SAIBORG
SamaraCTF
SanthacklausCTF
SarCTF
Saudi CTF
Sawah Cyber Security CTF
SCAN
SCAN Digital Asset Tracing Challenge
School CTF
SCP CTF
ScytheCTF
SecOps'24 - Blue Teaming CTF
SECPlayground CTF
Secret of the ePA-TI
SECUINSIDE CTF Finals
SECUINSIDE CTF Quals
Secura Grand Slam
Securebug.se CTF
Security Case Study
SecurITy Challenge - VianuCTF
Seize da Flaq
SHA CTF
shadow CTF
Sharif University CTF
Sharif University CTF Finals
Shellter Hacking Express
SibCTF Finals
SibirCTF
Sieberrsec CTF
SIGSEGv
Singapore AI CTF
SkillBit (formerly MetaCTF)
SLAY CTF
smolathon
Snowfort
SOC Battle
Sogeti Cyber e-Scape
SOLAR CTF
Space Grand Challenge
SPbCTF's Student CTF
spoilersCTF
SPRUSH CTF
SSCTF
SSMCTF
Stack The Flags
STANDCON CTF
Standoff Cyberbattle
STAY ~/ CTF
Stealth-Cup
STEM CTF
Sthack
STMCTF
Stranger's CTF
Sudocrypt
SUN CTF
Synchrony Infosec University Hackathon
Säkerhets-SM
Sécu'RT
T-CTF
T3 Phoenix CTF
Takoma Park CTF
Tangerang Kota Capture The Flag
TCM Invitational CTF
TCS Hackquest
Team Matrix CTF
TeamH4C CTF
Technex CTF
th3jackers WCTF
The Cyber Cooperative CTF
The Haunted Brewery
The heart of sysola
The Threat Interceptors Challenge
TheDeccanCTF
Thryve CTF
ThunderCipher CTF
Tiger King CTF
Timisoara CTF
TON CTF
Trace Labs Global OSINT Search Party CTF
Trend Micro CTF - Raimund Genes Cup
Triada CTF
TRIBE CTF
TrojanCTF
TSJ CTF
TU Delft CTF
TuxCTF
TyumenCTF
UConn CyberSEED
UFO CTF
Ukrainian National CTF
UND CyberHawks National Capture The Flag Competition
UNICORN CTF
UNIT 7300 CTF
UNLOCK THE TECHNOVERSE
UralCUP
usd Hacking Night
UTC-CTF
VeniVidiVici
Vidyut CTF
VSL CTF
VU Cyberthon
vulnfreak
WatchList CTF
WayneState - Capture-The-Flag
WCTF
Web-vkl CTF
WEC CTF
WhiteHat Challenge
WhiteHat Contest
WhiteHat Grand Prix
WiCSME CTF
WOCS'hAck
World Hacker Games - TestSavant
WP CTF
WSUCTF
wtftime CTF
X-MAS GTF
XCTF-SUCTF
XeroCTF
XiomaraCTF
YASCON CTF
YauzaCTF
YCTF
YetiCTF
YPSICTF
YUBITSEC CTF
Z3R0D4Y CTF
ZDTM CTF
ZenityCTF
ZEROBREACH CTF
ZerodayHeist
ZeroDays CTF
ZeroSecure CTF
Zia CTF
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🇨🇦 Canada
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🇪🇸 Spain
🇫🇷 France
🇬🇧 United Kingdom
🇭🇰 Hong Kong
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Must have
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22 challenges ·
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Challenge
CTF
Weight
Category
Has
Cryptoclock
#known-plaintext-xor
NahamCon 2025
53.77
Crypto
files
wu 1
ForgeMe_2
#hash-length-extension
NahamCon 2023
34.82
Crypto
files
wu 1
Just_One_More
#linear-system
NahamCon 2023
34.82
Crypto
files
wu 2
RSA_Intro
#textbook-rsa
NahamCon 2023
34.82
Crypto
files
wu 1
RSA_Outro
#rsa-related-primes
NahamCon 2023
34.82
Crypto
files
wu 3
Signed_Jeopardy
#ecdsa-nonce-reuse
NahamCon 2023
34.82
Crypto
files
wu 1
Unimod
#shift-cipher-bruteforce
NahamCon 2022
24.61
Crypto
files
wu 3
XORROX
#xor-keystream-reversal
NahamCon 2022
24.61
Crypto
files
wu 3
DiceRoll
#mt19937-prediction
NahamCon 2021
24.98
Crypto
files
wu 3
Pee_Kay_See_Ess_7
NahamCon 2022
24.61
Crypto
files
wu 1
Cookie_Encryption
NahamCon 2025
53.77
Crypto
files
Cookie_Encryption_2
NahamCon 2025
53.77
Crypto
files
Blackjack
NahamCon 2024
41.61
Crypto
files
Encryption_Server
NahamCon 2024
41.61
Crypto
files
Magic_RSA
NahamCon 2024
41.61
Crypto
files
Rigged_Lottery
NahamCon 2024
41.61
Crypto
files
ForgeMe_1
NahamCon 2023
34.82
Crypto
files
Shapeshifter
NahamCon 2022 EU
24.61
Crypto
files
dont_hack_my_d
NahamCon 2022 EU
24.61
Crypto
files
rektcursion
NahamCon 2022 EU
24.61
Crypto
files
Treasure
NahamCon 2021
24.98
Crypto
files
eaxy
NahamCon 2021
24.98
Crypto
files