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@kakur41

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kakur41

@kakur41

AUTHORED CHALLENGES

OPEN DATECHALLENGESOLVES

2026/03/01

Bars
Web
296 solves

2026/02/22

Alpaca Quest
Rev
113 solves

2026/02/15

Alpaillier
Crypto
117 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 3/22-3/28
ja
encrypted-p

4 days ago

Writeup for Daily AlpacaHack 3/15-3/21
ja
The future path

2 weeks ago

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

3 weeks ago

Writeup for Resume Maker
ja
Resume Maker

last month

Writeup for 9️⃣
ja
9️⃣

last month

Writeup for useful-gadget
ja
useful-gadget

last month

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

last month

Writeup for Stealerusk
ja
Stealerusk

last month

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

last month

Writeup for ECRSA
ja
ECRSA

last month

Writeup for ret2basics
ja
ret2basics

last month

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

2 months ago

Writeup for Linear Coffee Generator
ja
Linear Coffee Generator

2 months ago

Writeup for shellcode-101
ja
shellcode-101

2 months ago

Writeup for No JS
ja
No JS

2 months ago

Writeup for ToyPQC
ja
ToyPQC

2 months ago

Writeup for git gc
ja
git gc

2 months ago

Writeup for Stateless Auth
ja
Stateless Auth

2 months ago

Writeup for Paca Paca Authenticator
ja
Paca Paca Authenticator

2 months ago

Writeup for Bashrunner
ja
Bashrunner

2 months ago

Writeup for Animal Viewer
ja
Animal Viewer

2 months ago

Writeup for dockerstack
ja
dockerstack

2 months ago

Writeup for system-v
ja
system-v

2 months ago

Writeup for ChaChaCha
ja
ChaChaCha

2 months ago

Writeup for dice roll
ja
dice roll

2 months ago

Writeup for Base Length
ja
Base Length

2 months ago

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

3 months ago

Writeup for Square RSA
en
Square RSA

3 months ago

Writeup for jailiaj
en
jailiaj

3 months ago

Writeup for Encoding Basics
en
Encoding Basics

3 months ago

Writeup for Fushigi Crawler
en
Fushigi Crawler

3 months ago

Writeup for Ruby Flag Checker
en
Ruby Flag Checker

3 months ago

Writeup for super-tomato
ja
super-tomato

3 months ago

Writeup for 108
ja
108

3 months ago

Writeup for RBG
ja
RBG

3 months ago

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

3 months ago

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

3 months ago

Writeup for simpleoverwrite
ja
simpleoverwrite

3 months ago

Writeup for Log Viewer
ja
Log Viewer

3 months ago

Writeup for Rotten Beef
ja
Rotten Beef

3 months ago

Writeup for cat3
ja
cat3

3 months ago

Writeup for Useful Machine
ja
Useful Machine

3 months ago

Writeup for Xmas Login
ja
Xmas Login

3 months ago

Writeup for RSA debug?
ja
RSA debug?

3 months ago

Writeup for omikuji
ja
omikuji

3 months ago

Writeup for alloc-101
ja
alloc-101

3 months ago

Writeup for Twilight
ja
Twilight

3 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

1️⃣
Misc
Daily AlpacaHack

128 solves

yesterday

Perljail
Misc
Daily AlpacaHack B-SIDE

28 solves

2 days ago

No Content
Web
Daily AlpacaHack

132 solves

2 days ago

login-bonus-2
Pwn
Daily AlpacaHack

74 solves

3 days ago

The Horn
Crypto
Daily AlpacaHack

92 solves

4 days ago

Impossible Puzzle
Web
Daily AlpacaHack

163 solves

5 days ago

You are my friend
Crypto
Daily AlpacaHack

145 solves

6 days ago

Pyrunner
Misc
Daily AlpacaHack B-SIDE

37 solves

6 days ago

Message For You
Web
Daily AlpacaHack

173 solves

last week

silence
Misc
Daily AlpacaHack

98 solves

last week

fsb-202
Pwn
Daily AlpacaHack B-SIDE

37 solves

last week

Tar Uploader
Web
Daily AlpacaHack

96 solves

last week

Dot Chain
Misc
Daily AlpacaHack

83 solves

last week

EncodeDecode
Misc
Daily AlpacaHack

84 solves

last week

encrypted-p
Crypto
Daily AlpacaHack

99 solves

last week

CRC-256
Crypto
Daily AlpacaHack B-SIDE

30 solves

2 weeks ago

Optimized expression
Rev
Daily AlpacaHack

114 solves

2 weeks ago

crypto_666
Crypto
Daily AlpacaHack

103 solves

2 weeks ago

What's Next
Web
Daily AlpacaHack

110 solves

2 weeks ago

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

32 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

canary leak
Pwn
Daily AlpacaHack

106 solves

2 weeks ago

Haec Horrenda
Misc
Daily AlpacaHack B-SIDE

28 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

memset note
Pwn
Daily AlpacaHack B-SIDE

42 solves

3 weeks ago

The future path
Crypto
Daily AlpacaHack

92 solves

3 weeks ago

flag.txt
Misc
Daily AlpacaHack

110 solves

3 weeks ago

El Dorado
Crypto
tkbctf5

1 solve

3 weeks ago

BSS BOF
Pwn
tkbctf5

22 solves

3 weeks ago

RANDOM IN THE FUTURE.
Crypto
tkbctf5

27 solves

3 weeks ago

Double Hint RSA
Crypto
tkbctf5

30 solves

3 weeks ago

Heuristic IPPON
Misc
Daily AlpacaHack

165 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

4 weeks ago

💯
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

102 solves

last month

high and low
Crypto
Daily AlpacaHack

86 solves

last month

magic number
Misc
Daily AlpacaHack

122 solves

last month

Resume Maker
Web
Daily AlpacaHack B-SIDE

53 solves

last month

Alert my Flag
Web
Daily AlpacaHack

164 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

146 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

108 solves

last month

Pickle Loader
Misc
Daily AlpacaHack

116 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

simple ROP
Pwn
Daily AlpacaHack

113 solves

last month

ret2basics
Pwn
Daily AlpacaHack B-SIDE

43 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

Alpaca-Llama Ranch
Pwn
Daily AlpacaHack

124 solves

last month

invisible-grep
Misc
Daily AlpacaHack B-SIDE

38 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

158 solves

2 months ago

The World
Misc
Daily AlpacaHack

189 solves

2 months ago

HellCouple
Crypto
Daily AlpacaHack B-SIDE

68 solves

2 months ago

RRe_Time_Limiter
Crypto
Daily AlpacaHack

175 solves

2 months ago

Magic Engine
Web
Daily AlpacaHack

269 solves

2 months ago

read-a-binary
Rev
Daily AlpacaHack

221 solves

2 months ago

Substance
Crypto
Daily AlpacaHack

237 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

136 solves

2 months ago

No JS
Web
Daily AlpacaHack

131 solves

2 months ago

ToyPQC
Crypto
Daily AlpacaHack

107 solves

2 months ago

git gc
Misc
Daily AlpacaHack

153 solves

2 months ago

Stateless Auth
Web
Daily AlpacaHack

167 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

179 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

151 solves

2 months ago

I wanna be the Admin
Web
Daily AlpacaHack

283 solves

2 months ago

Basic Buffer Overflow
Pwn
Daily AlpacaHack

185 solves

2 months ago

crazython
Rev
Daily AlpacaHack

186 solves

2 months ago

RSA2026
Crypto
Daily AlpacaHack

209 solves

2 months ago

SwapSwap
Misc
Daily AlpacaHack

283 solves

3 months ago

secret-table
Web
Daily AlpacaHack

269 solves

3 months ago

Square RSA
Crypto
Daily AlpacaHack

234 solves

3 months ago

jailiaj
Misc
Daily AlpacaHack

280 solves

3 months ago

Encoding Basics
MiscCrypto
Daily AlpacaHack

315 solves

3 months ago

Fushigi Crawler
Web
Daily AlpacaHack

341 solves

3 months ago

Ruby Flag Checker
Rev
Daily AlpacaHack

288 solves

3 months ago

super-tomato
Crypto
Daily AlpacaHack

387 solves

3 months ago

Noisy Channel
Crypto

1 solve

3 months ago

108
Misc
Daily AlpacaHack

295 solves

3 months ago

RBG
Crypto
Daily AlpacaHack

122 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

351 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

253 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

3 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

876 solves

4 months ago

AlpacaHack 2100
Misc
Daily AlpacaHack

1618 solves

4 months ago

Iron Door
Crypto
CakeCTF 2023

7 solves

last year

Rock Door
Crypto
CakeCTF 2022

10 solves

last year

Oyster
Pwn
AlpacaHack Round 10 (Pwn)

129 solves

last year

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

7 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)

146 solves

last year

masking tape
Rev
AlpacaHack Round 8 (Rev)

173 solves

last year

Treasure Hunt
Web
AlpacaHack Round 7 (Web)

271 solves

last year

inbound
Pwn
AlpacaHack Round 6 (Pwn)

207 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

48 solves

last year

NNNN
Crypto
AlpacaHack Round 5 (Crypto)

50 solves

last year

pytecode
Rev
AlpacaHack Round 4 (Rev)

26 solves

last year

XorshiftStream
Crypto
AlpacaHack Round 5 (Crypto)

65 solves

last year

janken vs yoshiking 2
Crypto
CakeCTF 2023

16 solves

last year

brand new crypto
Crypto
CakeCTF 2022

25 solves

last year

welkerme
Pwn
CakeCTF 2022

26 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)

127 solves

last year

Rainbow Sweet Alchemist
Crypto
AlpacaHack Round 3 (Crypto)

124 solves

last year

qrime
Crypto
AlpacaHack Round 3 (Crypto)

253 solves

last year

Simple Login
Web
AlpacaHack Round 2 (Web)

609 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)

114 solves

last year

echo
Pwn
AlpacaHack Round 1 (Pwn)

357 solves

last year

aush
Pwn
zer0pts CTF 2023

22 solves

last year

luau
Rev
CakeCTF 2022

34 solves

last year

CakeGEAR
Web
CakeCTF 2022

81 solves

last year

TOWFL
WebCheat
CakeCTF 2023

51 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

71 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

162 solves

last year

vtable4b
Pwn
CakeCTF 2023

61 solves

last year

Country DB
Web
CakeCTF 2023

222 solves

last year

Welcome
Misc

1541 solves

last year