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colza

@colza12_

AUTHORED CHALLENGES

OPEN DATECHALLENGESOLVES

2026/03/19

canary leak
Pwn
106 solves

2026/03/11

kappa overflow
Pwn
120 solves

CTF HISTORY

START DATECTFRANK

2025/03/01

SECCON CTF 13 決勝観戦CTF
81 / 233

WRITEUPS

WRITEUPCREATED AT
Writeup for canary leak
ja
canary leak

2 weeks ago

Writeup for kappa overflow
ja
kappa overflow

3 weeks ago

SOLVED CHALLENGES

CHALLENGESOLVES

SOLVED AT

login-bonus-2
Pwn
Daily AlpacaHack

76 solves

3 days ago

silence
Misc
Daily AlpacaHack

98 solves

last week

fsb-202
Pwn
Daily AlpacaHack B-SIDE

37 solves

last week

Tar Uploader
Web
Daily AlpacaHack

97 solves

last week

Dot Chain
Misc
Daily AlpacaHack

84 solves

last week

EncodeDecode
Misc
Daily AlpacaHack

84 solves

last week

encrypted-p
Crypto
Daily AlpacaHack

100 solves

2 weeks ago

CRC-256
Crypto
Daily AlpacaHack B-SIDE

30 solves

2 weeks ago

Optimized expression
Rev
Daily AlpacaHack

115 solves

2 weeks ago

The past or the future?
Crypto
Daily AlpacaHack B-SIDE

32 solves

2 weeks ago

crypto_666
Crypto
Daily AlpacaHack

104 solves

2 weeks ago

What's Next
Web
Daily AlpacaHack

110 solves

2 weeks ago

bloom
Crypto
Daily AlpacaHack

86 solves

2 weeks ago

vuln4vuln
Pwn
Daily AlpacaHack

94 solves

2 weeks ago

Alpacker
Rev
Daily AlpacaHack

77 solves

2 weeks ago

Haec Horrenda
Misc
Daily AlpacaHack B-SIDE

28 solves

2 weeks ago

canary leak
Pwn
Daily AlpacaHack

106 solves

3 weeks ago

Flags for the FLAG
Misc
Daily AlpacaHack

148 solves

3 weeks ago

PPPPParse
Misc
Daily AlpacaHack

98 solves

3 weeks ago

Free Coupon
Web
Daily AlpacaHack

135 solves

3 weeks ago

UOUO FISH JAIL
Misc
Daily AlpacaHack B-SIDE

36 solves

3 weeks ago

The future path
Crypto
Daily AlpacaHack

92 solves

3 weeks ago

memset note
Pwn
Daily AlpacaHack B-SIDE

42 solves

3 weeks ago

flag.txt
Misc
Daily AlpacaHack

110 solves

3 weeks ago

Heuristic IPPON
Misc
Daily AlpacaHack

166 solves

3 weeks ago

Another Login Challenge
Web
Daily AlpacaHack

122 solves

3 weeks ago

kappa overflow
Pwn
Daily AlpacaHack

120 solves

4 weeks ago

Find XOR key
Crypto
Daily AlpacaHack

147 solves

last month

💯
Misc
Daily AlpacaHack

115 solves

last month

iwashi
Crypto
Daily AlpacaHack B-SIDE

37 solves

last month

FLAG OVER
Misc
Daily AlpacaHack

114 solves

last month

guess.js
Misc
Daily AlpacaHack

103 solves

last month

high and low
Crypto
Daily AlpacaHack

86 solves

last month

magic number
Misc
Daily AlpacaHack

123 solves

last month

Resume Maker
Web
Daily AlpacaHack B-SIDE

53 solves

last month

Alert my Flag
Web
Daily AlpacaHack

166 solves

last month

Flag Printer 2026
Misc
Daily AlpacaHack

203 solves

last month

glibc's secret function
Rev
Daily AlpacaHack

193 solves

last month

Bars
Web
Daily AlpacaHack

296 solves

last month

9️⃣
Misc
Daily AlpacaHack B-SIDE

47 solves

last month

pyjs
Misc
Daily AlpacaHack

82 solves

last month

Rock Paper Scissors Lizard Spock
Web
Daily AlpacaHack

95 solves

last month

One Byte Padding Oracle Attack
Crypto
Daily AlpacaHack

74 solves

last month

useful-gadget
Pwn
Daily AlpacaHack B-SIDE

45 solves

last month

Alpaca Rangers
Web
Daily AlpacaHack

147 solves

last month

hit-and-hit
Misc
Daily AlpacaHack

85 solves

last month

Alpaca Quest
Rev
Daily AlpacaHack

113 solves

last month

Noob programmer
Pwn
Daily AlpacaHack

103 solves

last month

Stealerusk
Rev
Daily AlpacaHack B-SIDE

44 solves

last month

CopperCopperCopper
Crypto
Daily AlpacaHack

92 solves

last month

Dancing Cursor
RevMisc
Daily AlpacaHack

109 solves

last month

Pickle Loader
Misc
Daily AlpacaHack

117 solves

last month

Disappeared
Pwn
Daily AlpacaHack

115 solves

last month

ECRSA
Crypto
Daily AlpacaHack B-SIDE

45 solves

last month

wages of sin()
RevMisc
Daily AlpacaHack

92 solves

last month

Alpaillier
Crypto
Daily AlpacaHack

117 solves

last month

You are being redirected
Web
Daily AlpacaHack

113 solves

last month

ret2basics
Pwn
Daily AlpacaHack B-SIDE

43 solves

last month

simple ROP
Pwn
Daily AlpacaHack

113 solves

last month

nc magic
Misc
Daily AlpacaHack

133 solves

last month

AAAAAAAAEEEEEEEESSSSSSSS
Crypto
Daily AlpacaHack

120 solves

last month

destructuring
Misc
Daily AlpacaHack

143 solves

last month

invisible-grep
Misc
Daily AlpacaHack B-SIDE

38 solves

last month

Alpaca-Llama Ranch
Pwn
Daily AlpacaHack

124 solves

last month

Plz Login
Web
Daily AlpacaHack

224 solves

last month

Compressor
Misc
Daily AlpacaHack

110 solves

2 months ago

misdirection
Rev
Daily AlpacaHack

161 solves

2 months ago

The World
Misc
Daily AlpacaHack

190 solves

2 months ago

HellCouple
Crypto
Daily AlpacaHack B-SIDE

68 solves

2 months ago

RRe_Time_Limiter
Crypto
Daily AlpacaHack

176 solves

2 months ago

Magic Engine
Web
Daily AlpacaHack

270 solves

2 months ago

read-a-binary
Rev
Daily AlpacaHack

223 solves

2 months ago

Substance
Crypto
Daily AlpacaHack

239 solves

2 months ago

Inu Profile
Web
Daily AlpacaHack B-SIDE

93 solves

2 months ago

optimal-sort
Misc
Daily AlpacaHack

104 solves

2 months ago

Linear Coffee Generator
Crypto
Daily AlpacaHack

114 solves

2 months ago

shellcode-101
Pwn
Daily AlpacaHack

137 solves

2 months ago

No JS
Web
Daily AlpacaHack

132 solves

2 months ago

ToyPQC
Crypto
Daily AlpacaHack

107 solves

2 months ago

git gc
Misc
Daily AlpacaHack

154 solves

2 months ago

Stateless Auth
Web
Daily AlpacaHack

168 solves

2 months ago

Paca Paca Authenticator
Crypto
Daily AlpacaHack

127 solves

2 months ago

Bashrunner
Misc
Daily AlpacaHack

120 solves

2 months ago

Animal Viewer
Web
Daily AlpacaHack

154 solves

2 months ago

dockerstack
Misc
Daily AlpacaHack

180 solves

2 months ago

system-v
Rev
Daily AlpacaHack

118 solves

2 months ago

ChaChaCha
Crypto
Daily AlpacaHack

157 solves

2 months ago

dice roll
Web
Daily AlpacaHack

201 solves

2 months ago

Base Length
Misc
Daily AlpacaHack

157 solves

2 months ago

Short Writer
Pwn
Daily AlpacaHack

123 solves

2 months ago

Five Alpacas
Crypto
Daily AlpacaHack

196 solves

2 months ago

free-comment
Misc
Daily AlpacaHack

152 solves

2 months ago

I wanna be the Admin
Web
Daily AlpacaHack

283 solves

2 months ago

Basic Buffer Overflow
Pwn
Daily AlpacaHack

186 solves

2 months ago

crazython
Rev
Daily AlpacaHack

186 solves

2 months ago

RSA2026
Crypto
Daily AlpacaHack

209 solves

3 months ago

SwapSwap
Misc
Daily AlpacaHack

283 solves

3 months ago

secret-table
Web
Daily AlpacaHack

270 solves

3 months ago

Square RSA
Crypto
Daily AlpacaHack

235 solves

3 months ago

jailiaj
Misc
Daily AlpacaHack

281 solves

3 months ago

Encoding Basics
MiscCrypto
Daily AlpacaHack

317 solves

3 months ago

Fushigi Crawler
Web
Daily AlpacaHack

342 solves

3 months ago

Ruby Flag Checker
Rev
Daily AlpacaHack

289 solves

3 months ago

super-tomato
Crypto
Daily AlpacaHack

388 solves

3 months ago

108
Misc
Daily AlpacaHack

296 solves

3 months ago

RBG
Crypto
Daily AlpacaHack

123 solves

3 months ago

one-p-rsa
Crypto
Daily AlpacaHack

231 solves

3 months ago

cha-ll-enge
Rev
SECCON Beginners CTF 2024

158 solves

3 months ago

simpleoverwrite
Pwn
SECCON Beginners CTF 2024

197 solves

3 months ago

Useful Machine
Rev
Daily AlpacaHack

157 solves

3 months ago

Xmas Login
Web
Daily AlpacaHack

352 solves

3 months ago

cat3
Misc
Daily AlpacaHack

221 solves

3 months ago

Rotten Beef
Pwn
Daily AlpacaHack

204 solves

3 months ago

Log Viewer
Web
Daily AlpacaHack

224 solves

3 months ago

RSA debug?
Crypto
Daily AlpacaHack

192 solves

3 months ago

omikuji
Web
Daily AlpacaHack

248 solves

3 months ago

alloc-101
Pwn
Daily AlpacaHack

217 solves

3 months ago

Twilight
Rev
Daily AlpacaHack

229 solves

3 months ago

login-bonus
Pwn
Daily AlpacaHack

254 solves

3 months ago

🐈
Web
Daily AlpacaHack

307 solves

3 months ago

Flag Printer 2100
Rev
Daily AlpacaHack

244 solves

3 months ago

power_obfus_royalty
Rev
Daily AlpacaHack

207 solves

3 months ago

Safe Prime
Crypto
SECCON Beginners CTF 2024

252 solves

3 months ago

Sugoi Flag Checker
Rev
Daily AlpacaHack

203 solves

3 months ago

Alpaca Bank
Web
Daily AlpacaHack

330 solves

4 months ago

Read Assembly
Rev
Daily AlpacaHack

309 solves

4 months ago

hit-and-miss
Misc
Daily AlpacaHack

385 solves

4 months ago

Fully Padded RSA
Crypto
Daily AlpacaHack

235 solves

4 months ago

size limit
Crypto
Daily AlpacaHack

316 solves

4 months ago

simpleoverflow
Pwn
SECCON Beginners CTF 2024

503 solves

4 months ago

Integer Writer
Pwn
Daily AlpacaHack

323 solves

4 months ago

Leaked Flag Checker
Rev
Daily AlpacaHack

562 solves

4 months ago

Emojify
Web
Daily AlpacaHack

588 solves

4 months ago

a fact of CTF
Crypto
Daily AlpacaHack

877 solves

4 months ago

AlpacaHack 2100
Misc
Daily AlpacaHack

1620 solves

4 months ago