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chocorusk

@nuo_chocorusk

AUTHORED CHALLENGES

OPEN DATECHALLENGESOLVES

2026/02/20

Stealerusk
Rev
40 solves

2026/02/04

HellCouple
Crypto
64 solves

2026/01/26

ToyPQC
Crypto
100 solves

2026/01/18

ChaChaCha
Crypto
149 solves

2025/12/11

Sugoi Flag Checker
Rev
191 solves

2025/01/26

RSAMPC
Crypto
35 solves

2025/01/26

Equivalent Privacy Wired
Crypto
9 solves

2025/01/26

addprimes
Crypto
27 solves

2024/10/12

Broadcasting NTRU
Crypto
10 solves

CTF HISTORY

START DATECTFRANK

2025/07/20

AlpacaHack Round 13 (Crypto)
1 / 62

2025/07/06

AlpacaHack Round 12 (Crypto)
2 / 78

2025/01/26

AlpacaHack Round 9 (Crypto)
20 / 138

2024/11/30

AlpacaHack Round 7 (Web)
22 / 458

2024/11/03

AlpacaHack Round 6 (Pwn)
58 / 197

2024/10/12

AlpacaHack Round 5 (Crypto)
32 / 247

2024/10/05

AlpacaHack Round 4 (Rev)
38 / 279

2024/09/15

AlpacaHack Round 3 (Crypto)
3 / 239

2024/09/01

AlpacaHack Round 2 (Web)
58 / 300

WRITEUPS

WRITEUPCREATED AT
Writeup for Bashrunner
ja
Bashrunner

last month

Author's Writeup for ChaChaCha
ja
official
ChaChaCha

last month

Author’s Writeup for Sugoi Flag Checker
ja
official
Sugoi Flag Checker

2 months ago

Writeup for SECCON CTF 13 Quals
ja
reiwa_rot13

last year

AlpacaHack Round 9 (Crypto) 作問者writeup
ja
official
AlpacaHack Round 9 (Crypto)

last year

Broadcasting NTRU 作問者writeup
ja
official
Broadcasting NTRU

last year

Writeup for AlpacaHack Round 3 (Crypto)
ja
AlpacaHack Round 3 (Crypto)

last year

SOLVED CHALLENGES

CHALLENGESOLVES

SOLVED AT

glibc's secret function
Rev
Daily AlpacaHack

117 solves

yesterday

Bars
Web
Daily AlpacaHack

147 solves

2 days ago

One Byte Padding Oracle Attack
Crypto
Daily AlpacaHack

66 solves

6 days ago

Alpaca Rangers
Web
Daily AlpacaHack

128 solves

last week

hit-and-hit
Misc
Daily AlpacaHack

76 solves

last week

Noob programmer
Pwn
Daily AlpacaHack

92 solves

last week

Alpaillier
Crypto
Daily AlpacaHack

108 solves

last week

Alpaca Quest
Rev
Daily AlpacaHack

102 solves

last week

CopperCopperCopper
Crypto
Daily AlpacaHack

84 solves

last week

ECRSA
Crypto
Daily AlpacaHack B-SIDE

44 solves

last week

Dancing Cursor
RevMisc
Daily AlpacaHack

100 solves

last week

wages of sin()
RevMisc
Daily AlpacaHack

85 solves

2 weeks ago

The World
Misc
Daily AlpacaHack

167 solves

3 weeks ago

RRe_Time_Limiter
Crypto
Daily AlpacaHack

162 solves

3 weeks ago

Magic Engine
Web
Daily AlpacaHack

227 solves

4 weeks ago

read-a-binary
Rev
Daily AlpacaHack

193 solves

4 weeks ago

Inu Profile
Web
Daily AlpacaHack B-SIDE

85 solves

last month

Substance
Crypto
Daily AlpacaHack

219 solves

last month

Stateless Auth
Web
Daily AlpacaHack

155 solves

last month

Paca Paca Authenticator
Crypto
Daily AlpacaHack

118 solves

last month

Bashrunner
Misc
Daily AlpacaHack

115 solves

last month

Animal Viewer
Web
Daily AlpacaHack

142 solves

last month

dockerstack
Misc
Daily AlpacaHack

170 solves

last month

system-v
Rev
Daily AlpacaHack

114 solves

last month

ChaChaCha
Crypto
Daily AlpacaHack

149 solves

last month

dice roll
Web
Daily AlpacaHack

187 solves

last month

Base Length
Misc
Daily AlpacaHack

147 solves

last month

Short Writer
Pwn
Daily AlpacaHack

115 solves

last month

Five Alpacas
Crypto
Daily AlpacaHack

180 solves

last month

free-comment
Misc
Daily AlpacaHack

144 solves

last month

I wanna be the Admin
Web
Daily AlpacaHack

249 solves

last month

Basic Buffer Overflow
Pwn
Daily AlpacaHack

165 solves

last month

crazython
Rev
Daily AlpacaHack

169 solves

last month

RSA2026
Crypto
Daily AlpacaHack

192 solves

last month

SwapSwap
Misc
Daily AlpacaHack

254 solves

last month

secret-table
Web
Daily AlpacaHack

245 solves

last month

Square RSA
Crypto
Daily AlpacaHack

215 solves

last month

jailiaj
Misc
Daily AlpacaHack

258 solves

last month

Encoding Basics
MiscCrypto
Daily AlpacaHack

285 solves

last month

Fushigi Crawler
Web
Daily AlpacaHack

302 solves

last month

Ruby Flag Checker
Rev
Daily AlpacaHack

263 solves

2 months ago

super-tomato
Crypto
Daily AlpacaHack

344 solves

2 months ago

RBG
Crypto
Daily AlpacaHack

117 solves

2 months ago

108
Misc
Daily AlpacaHack

264 solves

2 months ago

one-p-rsa
Crypto
Daily AlpacaHack

209 solves

2 months ago

cha-ll-enge
Rev
Daily AlpacaHack

142 solves

2 months ago

simpleoverwrite
Pwn
Daily AlpacaHack

176 solves

2 months ago

Useful Machine
Rev
Daily AlpacaHack

149 solves

2 months ago

Xmas Login
Web
Daily AlpacaHack

304 solves

2 months ago

cat3
Misc
Daily AlpacaHack

205 solves

2 months ago

Rotten Beef
Pwn
Daily AlpacaHack

186 solves

2 months ago

Log Viewer
Web
Daily AlpacaHack

211 solves

2 months ago

RSA debug?
Crypto
Daily AlpacaHack

179 solves

2 months ago

omikuji
Web
Daily AlpacaHack

227 solves

2 months ago

alloc-101
Pwn
Daily AlpacaHack

202 solves

2 months ago

Twilight
Rev
Daily AlpacaHack

212 solves

2 months ago

login-bonus
Pwn
Daily AlpacaHack

232 solves

2 months ago

🐈
Web
Daily AlpacaHack

285 solves

2 months ago

Flag Printer 2100
Rev
Daily AlpacaHack

227 solves

2 months ago

power_obfus_royalty
Rev
Daily AlpacaHack

192 solves

2 months ago

Safe Prime
Crypto
Daily AlpacaHack

240 solves

2 months ago

Sugoi Flag Checker
Rev
Daily AlpacaHack

191 solves

2 months ago

Alpaca Bank
Web
Daily AlpacaHack

300 solves

2 months ago

Read Assembly
Rev
Daily AlpacaHack

291 solves

2 months ago

hit-and-miss
Misc
Daily AlpacaHack

345 solves

2 months ago

Fully Padded RSA
Crypto
Daily AlpacaHack

221 solves

2 months ago

Integer Writer
Pwn
Daily AlpacaHack

290 solves

2 months ago

size limit
Crypto
Daily AlpacaHack

287 solves

2 months ago

Leaked Flag Checker
Rev
Daily AlpacaHack

502 solves

2 months ago

a fact of CTF
Crypto
Daily AlpacaHack

769 solves

2 months ago

Emojify
Web
Daily AlpacaHack

521 solves

2 months ago

AlpacaHack 2100
Misc
Daily AlpacaHack

1343 solves

2 months ago

simpleoverflow
Pwn
Daily AlpacaHack

448 solves

2 months ago

MissingNo.2
Crypto
AlpacaHack Round 13 (Crypto)

7 solves

7 months ago

MissingNo.1
Crypto
AlpacaHack Round 13 (Crypto)

10 solves

7 months ago

Polynomial Puzzle
Crypto
AlpacaHack Round 13 (Crypto)

5 solves

7 months ago

Jerr0-day
Crypto
AlpacaHack Round 13 (Crypto)

14 solves

7 months ago

Jerry's flag checker
Crypto
AlpacaHack Round 13 (Crypto)

32 solves

7 months ago

Zero-sum game
Crypto
AlpacaHack Round 12 (Crypto)

4 solves

8 months ago

Flag Sharing
Crypto
AlpacaHack Round 12 (Crypto)

9 solves

8 months ago

OTEC
Crypto
AlpacaHack Round 12 (Crypto)

39 solves

8 months ago

RSARSARSARSARSARSA
Crypto
AlpacaHack Round 12 (Crypto)

79 solves

8 months ago

Trillion Ether
Blockchain
SECCON CTF 13 Quals

6 solves

last year

Tidal wave
Crypto
SECCON CTF 13 Quals

5 solves

last year

dual_summon
Crypto
SECCON CTF 13 Quals

9 solves

last year

reiwa_rot13
Crypto
SECCON CTF 13 Quals

28 solves

last year

addprimes
Crypto
AlpacaHack Round 9 (Crypto)

27 solves

last year

Equivalent Privacy Wired
Crypto
AlpacaHack Round 9 (Crypto)

9 solves

last year

RSAMPC
Crypto
AlpacaHack Round 9 (Crypto)

35 solves

last year

ffmac
Crypto
AlpacaHack Round 9 (Crypto)

8 solves

last year

Alpaca Poll
Web
AlpacaHack Round 7 (Web)

128 solves

last year

Treasure Hunt
Web
AlpacaHack Round 7 (Web)

266 solves

last year

SchnorrLCG
Crypto
AlpacaHack Round 5 (Crypto)

22 solves

last year

NNNN
Crypto
AlpacaHack Round 5 (Crypto)

47 solves

last year

XorshiftStream
Crypto
AlpacaHack Round 5 (Crypto)

62 solves

last year

Broadcasting NTRU
Crypto
AlpacaHack Round 5 (Crypto)

10 solves

last year

Simple Flag Checker
Rev
AlpacaHack Round 4 (Rev)

125 solves

last year

Hat Trick
Crypto
AlpacaHack Round 3 (Crypto)

65 solves

last year

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

74 solves

last year

Rainbow Sweet Alchemist
Crypto
AlpacaHack Round 3 (Crypto)

122 solves

last year

qrime
Crypto
AlpacaHack Round 3 (Crypto)

250 solves

last year

echo
Pwn
AlpacaHack Round 1 (Pwn)

345 solves

last year

Pico Note 1
Web
AlpacaHack Round 2 (Web)

80 solves

last year

CaaS
Web
AlpacaHack Round 2 (Web)

92 solves

last year

Simple Login
Web
AlpacaHack Round 2 (Web)

587 solves

last year

Welcome
Misc

1455 solves

last year