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@kakur41

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kakur41

@kakur41

AUTHORED CHALLENGES

OPEN DATECHALLENGESOLVES

2026/03/01

Bars
Web
219 solves

2026/02/22

Alpaca Quest
Rev
107 solves

2026/02/15

Alpaillier
Crypto
112 solves

CTF HISTORY

START DATECTFRANK

2025/07/20

AlpacaHack Round 13 (Crypto)
23 / 62

2025/03/23

AlpacaHack Round 10 (Pwn)
34 / 95

2025/03/01

SECCON CTF 13 決勝観戦CTF
1 / 233

2024/11/03

AlpacaHack Round 6 (Pwn)
51 / 197

2024/10/12

AlpacaHack Round 5 (Crypto)
32 / 247

2024/10/05

AlpacaHack Round 4 (Rev)
42 / 279

2024/09/01

AlpacaHack Round 2 (Web)
85 / 300

2024/08/18

AlpacaHack Round 1 (Pwn)
32 / 174

WRITEUPS

WRITEUPCREATED AT
Writeup for Daily AlpacaHack 3/8-3/14
ja
guess.js

3 days ago

Writeup for Resume Maker
ja
Resume Maker

last week

Writeup for 9️⃣
ja
9️⃣

last week

Writeup for useful-gadget
ja
useful-gadget

2 weeks ago

Writeup for Daily AlpacaHack 2/22-2/28
ja
Noob programmer

2 weeks ago

Writeup for Stealerusk
ja
Stealerusk

3 weeks ago

Writeup for Daily AlpacaHack 2/15-2/21
ja
wages of sin()

3 weeks ago

Writeup for ECRSA
ja
ECRSA

3 weeks ago

Writeup for ret2basics
ja
ret2basics

4 weeks ago

Writeup for Daily AlpacaHack 2/8-2/14
ja
AAAAAAAAEEEEEEEESSSSSSSS

last month

Writeup for invisible-grep
ja
invisible-grep

last month

Writeup for HellCouple
ja
HellCouple

last month

Writeup for Inu Profile
ja
Inu Profile

last month

Writeup for optimal-sort
ja
optimal-sort

last month

Writeup for Linear Coffee Generator
ja
Linear Coffee Generator

last month

Writeup for shellcode-101
ja
shellcode-101

last month

Writeup for No JS
ja
No JS

last month

Writeup for ToyPQC
ja
ToyPQC

last month

Writeup for git gc
ja
git gc

last month

Writeup for Stateless Auth
ja
Stateless Auth

last month

Writeup for Paca Paca Authenticator
ja
Paca Paca Authenticator

last month

Writeup for Bashrunner
ja
Bashrunner

last month

Writeup for Animal Viewer
ja
Animal Viewer

last month

Writeup for dockerstack
ja
dockerstack

last month

Writeup for system-v
ja
system-v

last month

Writeup for ChaChaCha
ja
ChaChaCha

last month

Writeup for dice roll
ja
dice roll

last month

Writeup for Base Length
ja
Base Length

last month

Writeup for Short Writer
ja
Short Writer

2 months ago

Writeup for Five Alpacas
ja
Five Alpacas

2 months ago

Writeup for free-comment
ja
free-comment

2 months ago

Writeup for I wanna be the Admin
ja
I wanna be the Admin

2 months ago

Writeup for Basic Buffer Overflow
ja
Basic Buffer Overflow

2 months ago

Writeup for crazython
ja
crazython

2 months ago

Writeup for RSA2026
en
RSA2026

2 months ago

Writeup for SwapSwap
en
SwapSwap

2 months ago

Writeup for secret-table
en
secret-table

2 months ago

Writeup for Square RSA
en
Square RSA

2 months ago

Writeup for jailiaj
en
jailiaj

2 months ago

Writeup for Encoding Basics
en
Encoding Basics

2 months ago

Writeup for Fushigi Crawler
en
Fushigi Crawler

2 months ago

Writeup for Ruby Flag Checker
en
Ruby Flag Checker

2 months ago

Writeup for super-tomato
ja
super-tomato

2 months ago

Writeup for 108
ja
108

2 months ago

Writeup for RBG
ja
RBG

2 months ago

Writeup for one-p-rsa
ja
one-p-rsa

2 months ago

Writeup for cha-ll-enge
ja
cha-ll-enge

2 months ago

Writeup for simpleoverwrite
ja
simpleoverwrite

2 months ago

Writeup for Log Viewer
ja
Log Viewer

2 months ago

Writeup for Rotten Beef
ja
Rotten Beef

2 months ago

Writeup for cat3
ja
cat3

2 months ago

Writeup for Useful Machine
ja
Useful Machine

2 months ago

Writeup for Xmas Login
ja
Xmas Login

2 months ago

Writeup for RSA debug?
ja
RSA debug?

2 months ago

Writeup for omikuji
ja
omikuji

2 months ago

Writeup for alloc-101
ja
alloc-101

2 months ago

Writeup for Twilight
ja
Twilight

2 months ago

Writeup for login-bonus
ja
login-bonus

3 months ago

Writeup for 🐈
ja
🐈

3 months ago

Writeup for Flag Printer 2100
ja
Flag Printer 2100

3 months ago

Writeup for Simple Flag Checker
ja
Simple Flag Checker

last year

Writeup for NetFS 2 (RST flag)
ja
NetFS 2

last year

Writeup for 1R-AES
ja
1R-AES

last year

SOLVED CHALLENGES

CHALLENGESOLVES

SOLVED AT

PPPPParse
Misc
Daily AlpacaHack

71 solves

22 hours ago

Free Coupon
Web
Daily AlpacaHack

106 solves

yesterday

memset note
Pwn
Daily AlpacaHack B-SIDE

34 solves

2 days ago

The future path
Crypto
Daily AlpacaHack

80 solves

2 days ago

flag.txt
Misc
Daily AlpacaHack

95 solves

3 days ago

El Dorado
Crypto
tkbctf5

1 solve

3 days ago

BSS BOF
Pwn
tkbctf5

22 solves

4 days ago

RANDOM IN THE FUTURE.
Crypto
tkbctf5

26 solves

4 days ago

Double Hint RSA
Crypto
tkbctf5

30 solves

4 days ago

Heuristic IPPON
Misc
Daily AlpacaHack

136 solves

4 days ago

Another Login Challenge
Web
Daily AlpacaHack

100 solves

5 days ago

kappa overflow
Pwn
Daily AlpacaHack

103 solves

6 days ago

Find XOR key
Crypto
Daily AlpacaHack

108 solves

last week

💯
Misc
Daily AlpacaHack

102 solves

last week

iwashi
Crypto
Daily AlpacaHack B-SIDE

33 solves

last week

FLAG OVER
Misc
Daily AlpacaHack

104 solves

last week

guess.js
Misc
Daily AlpacaHack

89 solves

last week

high and low
Crypto
Daily AlpacaHack

78 solves

last week

magic number
Misc
Daily AlpacaHack

107 solves

last week

Resume Maker
Web
Daily AlpacaHack B-SIDE

46 solves

last week

Alert my Flag
Web
Daily AlpacaHack

134 solves

last week

Flag Printer 2026
Misc
Daily AlpacaHack

160 solves

2 weeks ago

glibc's secret function
Rev
Daily AlpacaHack

156 solves

2 weeks ago

Bars
Web
Daily AlpacaHack

219 solves

2 weeks ago

9️⃣
Misc
Daily AlpacaHack B-SIDE

45 solves

2 weeks ago

pyjs
Misc
Daily AlpacaHack

77 solves

2 weeks ago

Rock Paper Scissors Lizard Spock
Web
Daily AlpacaHack

88 solves

2 weeks ago

One Byte Padding Oracle Attack
Crypto
Daily AlpacaHack

69 solves

2 weeks ago

useful-gadget
Pwn
Daily AlpacaHack B-SIDE

43 solves

2 weeks ago

Alpaca Rangers
Web
Daily AlpacaHack

132 solves

3 weeks ago

hit-and-hit
Misc
Daily AlpacaHack

81 solves

3 weeks ago

Alpaca Quest
Rev
Daily AlpacaHack

107 solves

3 weeks ago

Noob programmer
Pwn
Daily AlpacaHack

94 solves

3 weeks ago

Stealerusk
Rev
Daily AlpacaHack B-SIDE

40 solves

3 weeks ago

CopperCopperCopper
Crypto
Daily AlpacaHack

86 solves

3 weeks ago

Dancing Cursor
RevMisc
Daily AlpacaHack

101 solves

3 weeks ago

Pickle Loader
Misc
Daily AlpacaHack

111 solves

3 weeks ago

Disappeared
Pwn
Daily AlpacaHack

105 solves

4 weeks ago

ECRSA
Crypto
Daily AlpacaHack B-SIDE

45 solves

4 weeks ago

wages of sin()
RevMisc
Daily AlpacaHack

86 solves

4 weeks ago

Alpaillier
Crypto
Daily AlpacaHack

112 solves

last month

You are being redirected
Web
Daily AlpacaHack

109 solves

last month

simple ROP
Pwn
Daily AlpacaHack

102 solves

last month

ret2basics
Pwn
Daily AlpacaHack B-SIDE

39 solves

last month

nc magic
Misc
Daily AlpacaHack

128 solves

last month

AAAAAAAAEEEEEEEESSSSSSSS
Crypto
Daily AlpacaHack

115 solves

last month

destructuring
Misc
Daily AlpacaHack

135 solves

last month

Alpaca-Llama Ranch
Pwn
Daily AlpacaHack

114 solves

last month

invisible-grep
Misc
Daily AlpacaHack B-SIDE

37 solves

last month

Plz Login
Web
Daily AlpacaHack

208 solves

last month

Compressor
Misc
Daily AlpacaHack

104 solves

last month

misdirection
Rev
Daily AlpacaHack

149 solves

last month

The World
Misc
Daily AlpacaHack

176 solves

last month

HellCouple
Crypto
Daily AlpacaHack B-SIDE

66 solves

last month

RRe_Time_Limiter
Crypto
Daily AlpacaHack

168 solves

last month

Magic Engine
Web
Daily AlpacaHack

246 solves

last month

read-a-binary
Rev
Daily AlpacaHack

209 solves

last month

Substance
Crypto
Daily AlpacaHack

229 solves

last month

Inu Profile
Web
Daily AlpacaHack B-SIDE

88 solves

last month

optimal-sort
Misc
Daily AlpacaHack

98 solves

last month

Linear Coffee Generator
Crypto
Daily AlpacaHack

109 solves

last month

shellcode-101
Pwn
Daily AlpacaHack

123 solves

last month

No JS
Web
Daily AlpacaHack

126 solves

last month

ToyPQC
Crypto
Daily AlpacaHack

103 solves

last month

git gc
Misc
Daily AlpacaHack

145 solves

last month

Stateless Auth
Web
Daily AlpacaHack

161 solves

last month

Paca Paca Authenticator
Crypto
Daily AlpacaHack

120 solves

last month

Bashrunner
Misc
Daily AlpacaHack

116 solves

last month

Animal Viewer
Web
Daily AlpacaHack

148 solves

last month

dockerstack
Misc
Daily AlpacaHack

172 solves

last month

system-v
Rev
Daily AlpacaHack

115 solves

last month

ChaChaCha
Crypto
Daily AlpacaHack

152 solves

last month

dice roll
Web
Daily AlpacaHack

193 solves

last month

Base Length
Misc
Daily AlpacaHack

148 solves

2 months ago

Short Writer
Pwn
Daily AlpacaHack

116 solves

2 months ago

Five Alpacas
Crypto
Daily AlpacaHack

184 solves

2 months ago

free-comment
Misc
Daily AlpacaHack

145 solves

2 months ago

I wanna be the Admin
Web
Daily AlpacaHack

262 solves

2 months ago

Basic Buffer Overflow
Pwn
Daily AlpacaHack

170 solves

2 months ago

crazython
Rev
Daily AlpacaHack

173 solves

2 months ago

RSA2026
Crypto
Daily AlpacaHack

197 solves

2 months ago

SwapSwap
Misc
Daily AlpacaHack

259 solves

2 months ago

secret-table
Web
Daily AlpacaHack

251 solves

2 months ago

Square RSA
Crypto
Daily AlpacaHack

219 solves

2 months ago

jailiaj
Misc
Daily AlpacaHack

260 solves

2 months ago

Encoding Basics
MiscCrypto
Daily AlpacaHack

289 solves

2 months ago

Fushigi Crawler
Web
Daily AlpacaHack

315 solves

2 months ago

Ruby Flag Checker
Rev
Daily AlpacaHack

269 solves

2 months ago

super-tomato
Crypto
Daily AlpacaHack

356 solves

2 months ago

Noisy Channel
Crypto

1 solve

2 months ago

108
Misc
Daily AlpacaHack

272 solves

2 months ago

RBG
Crypto
Daily AlpacaHack

120 solves

2 months ago

one-p-rsa
Crypto
Daily AlpacaHack

215 solves

2 months ago

cha-ll-enge
Rev
Daily AlpacaHack

147 solves

2 months ago

simpleoverwrite
Pwn
Daily AlpacaHack

182 solves

2 months ago

Useful Machine
Rev
Daily AlpacaHack

153 solves

2 months ago

Xmas Login
Web
Daily AlpacaHack

322 solves

2 months ago

cat3
Misc
Daily AlpacaHack

208 solves

2 months ago

Rotten Beef
Pwn
Daily AlpacaHack

192 solves

2 months ago

Log Viewer
Web
Daily AlpacaHack

215 solves

2 months ago

RSA debug?
Crypto
Daily AlpacaHack

181 solves

2 months ago

omikuji
Web
Daily AlpacaHack

234 solves

2 months ago

alloc-101
Pwn
Daily AlpacaHack

207 solves

2 months ago

Twilight
Rev
Daily AlpacaHack

219 solves

3 months ago

login-bonus
Pwn
Daily AlpacaHack

237 solves

3 months ago

🐈
Web
Daily AlpacaHack

291 solves

3 months ago

Flag Printer 2100
Rev
Daily AlpacaHack

233 solves

3 months ago

power_obfus_royalty
Rev
Daily AlpacaHack

195 solves

3 months ago

Safe Prime
Crypto
Daily AlpacaHack

241 solves

3 months ago

Sugoi Flag Checker
Rev
Daily AlpacaHack

195 solves

3 months ago

Alpaca Bank
Web
Daily AlpacaHack

310 solves

3 months ago

Read Assembly
Rev
Daily AlpacaHack

298 solves

3 months ago

hit-and-miss
Misc
Daily AlpacaHack

359 solves

3 months ago

Fully Padded RSA
Crypto
Daily AlpacaHack

224 solves

3 months ago

size limit
Crypto
Daily AlpacaHack

294 solves

3 months ago

simpleoverflow
Pwn
Daily AlpacaHack

466 solves

3 months ago

Integer Writer
Pwn
Daily AlpacaHack

303 solves

3 months ago

Leaked Flag Checker
Rev
Daily AlpacaHack

525 solves

3 months ago

Emojify
Web
Daily AlpacaHack

545 solves

3 months ago

a fact of CTF
Crypto
Daily AlpacaHack

811 solves

3 months ago

AlpacaHack 2100
Misc
Daily AlpacaHack

1454 solves

3 months ago

Iron Door
Crypto
CakeCTF 2023

7 solves

11 months ago

Rock Door
Crypto
CakeCTF 2022

10 solves

11 months ago

Oyster
Pwn
AlpacaHack Round 10 (Pwn)

125 solves

12 months ago

packed
Rev
SECCON CTF 13 Quals

15 solves

last year

only-read
Pwn
RTACTF 2023 Spring

22 solves

last year

read-write
Pwn
RTACTF 2023 Spring

41 solves

last year

I2C Device
Rev
AlpacaHack Round 4 (Rev)

10 solves

last year

EDDH
Crypto
zer0pts CTF 2022

6 solves

last year

CurveCrypto
Crypto
zer0pts CTF 2022

6 solves

last year

1linepyjail
Jail
SECCON CTF 13 Quals

5 solves

last year

reiwa_rot13
Crypto
SECCON CTF 13 Quals

29 solves

last year

Alpaca Poll
Web
AlpacaHack Round 7 (Web)

129 solves

last year

catcpy
Pwn
AlpacaHack Round 6 (Pwn)

145 solves

last year

masking tape
Rev
AlpacaHack Round 8 (Rev)

173 solves

last year

Treasure Hunt
Web
AlpacaHack Round 7 (Web)

266 solves

last year

inbound
Pwn
AlpacaHack Round 6 (Pwn)

205 solves

last year

Modern Rome
Pwn
zer0pts CTF 2022

24 solves

last year

Anti-Fermat
Crypto
zer0pts CTF 2022

30 solves

last year

GitFile Explorer
Web
zer0pts CTF 2022

47 solves

last year

NNNN
Crypto
AlpacaHack Round 5 (Crypto)

48 solves

last year

pytecode
Rev
AlpacaHack Round 4 (Rev)

26 solves

last year

XorshiftStream
Crypto
AlpacaHack Round 5 (Crypto)

63 solves

last year

janken vs yoshiking 2
Crypto
CakeCTF 2023

16 solves

last year

brand new crypto
Crypto
CakeCTF 2022

24 solves

last year

welkerme
Pwn
CakeCTF 2022

25 solves

last year

nande
Rev
CakeCTF 2023

16 solves

last year

Hat Trick
Crypto
AlpacaHack Round 3 (Crypto)

66 solves

last year

C-Sandbox
Misc
CakeCTF 2022

5 solves

last year

readme 2022
Misc
CakeCTF 2022

14 solves

last year

A Dance of Add and Mul
Crypto
AlpacaHack Round 3 (Crypto)

74 solves

last year

Simple Flag Checker
Rev
AlpacaHack Round 4 (Rev)

125 solves

last year

Rainbow Sweet Alchemist
Crypto
AlpacaHack Round 3 (Crypto)

124 solves

last year

qrime
Crypto
AlpacaHack Round 3 (Crypto)

250 solves

last year

Simple Login
Web
AlpacaHack Round 2 (Web)

594 solves

last year

mimikyu
Rev
zer0pts CTF 2023

15 solves

last year

Cake Puzzle
Rev
CakeCTF 2023

20 solves

last year

hexecho
Pwn
AlpacaHack Round 1 (Pwn)

112 solves

last year

echo
Pwn
AlpacaHack Round 1 (Pwn)

348 solves

last year

aush
Pwn
zer0pts CTF 2023

22 solves

last year

luau
Rev
CakeCTF 2022

34 solves

last year

CakeGEAR
Web
CakeCTF 2022

79 solves

last year

TOWFL
WebCheat
CakeCTF 2023

50 solves

last year

bofww
Pwn
CakeCTF 2023

38 solves

last year

NetFS 2
Misc
zer0pts CTF 2023

3 solves

last year

NetFS 1
Misc
zer0pts CTF 2023

12 solves

last year

nimrev
Rev
CakeCTF 2022

79 solves

last year

simple signature
Crypto
CakeCTF 2023

28 solves

last year

frozen cake
Crypto
CakeCTF 2022

70 solves

last year

SquareRNG
Crypto
zer0pts CTF 2023

15 solves

last year

decompile me
Rev
zer0pts CTF 2023

48 solves

last year

1R-AES
Crypto
RTACTF 2023 Spring

17 solves

last year

easy_factoring
Crypto
zer0pts CTF 2023

29 solves

last year

Reused-AES
Crypto
RTACTF 2023 Spring

33 solves

last year

Collision-DES
Crypto
RTACTF 2023 Spring

37 solves

last year

write
Pwn
RTACTF 2023 Spring

85 solves

last year

XOR-CBC
Crypto
RTACTF 2023 Spring

77 solves

last year

before-write
Pwn
RTACTF 2023 Spring

160 solves

last year

vtable4b
Pwn
CakeCTF 2023

61 solves

last year

Country DB
Web
CakeCTF 2023

220 solves

last year

Welcome
Misc

1504 solves

last year