@hiikunz - AlpacaHack

hiikunz

@hiikun_Z

AUTHORED CHALLENGES

OPEN DATE	CHALLENGE	SOLVES
2026/04/03	Perljail Misc	29 solves
2026/04/03	Impossible Puzzle Web	181 solves
2026/03/27	EncodeDecode Misc	86 solves
2026/03/08	iwashi Crypto	38 solves
2026/02/13	simple ROP Pwn	114 solves
2026/02/11	AAAAAAAAEEEEEEEESSSSSSSS Crypto	121 solves
2026/02/07	Compressor Misc	110 solves
2026/01/21	Animal Viewer Web	154 solves
2026/01/17	dice roll Web	202 solves
2026/01/14	Five Alpacas Crypto	196 solves
2026/01/11	Basic Buffer Overflow Pwn	186 solves
2026/01/08	SwapSwap Misc	288 solves
2026/01/06	Square RSA Crypto	235 solves
2026/01/02	Ruby Flag Checker Rev	289 solves
2025/12/24	Xmas Login Web	354 solves
2025/12/22	Rotten Beef Pwn	204 solves
2025/12/14	Flag Printer 2100 Rev	247 solves
2025/12/10	Alpaca Bank Web	332 solves

CTF HISTORY

START DATE	CTF	RANK
2025/07/20	AlpacaHack Round 13 (Crypto)	14 / 62
2025/07/06	AlpacaHack Round 12 (Crypto)	6 / 78
2025/05/17	AlpacaHack Round 11 (Web)	51 / 213
2025/03/01	SECCON CTF 13 決勝観戦CTF	7 / 233
2025/01/26	AlpacaHack Round 9 (Crypto)	20 / 138
2024/11/30	AlpacaHack Round 7 (Web)	73 / 458
2024/10/12	AlpacaHack Round 5 (Crypto)	14 / 247
2024/10/05	AlpacaHack Round 4 (Rev)	30 / 279
2024/09/15	AlpacaHack Round 3 (Crypto)	7 / 239
2024/09/01	AlpacaHack Round 2 (Web)	5 / 300
2024/08/18	AlpacaHack Round 1 (Pwn)	16 / 174

WRITEUPS

WRITEUP	CREATED AT
Writeup for Haec Horrenda ja Haec Horrenda	3 weeks ago
Writeup for pyjs ja pyjs	last month
Writeup for Rotten Beef ja official Rotten Beef	3 months ago
Writeup for Flag Printer 2100 ja official Flag Printer 2100	3 months ago
Writeup for Alpaca Bank ja official Alpaca Bank	4 months ago
Writeup for minimal-waf with <link rel="prefetch"> ja minimal-waf	last year
Writeup for AlpacaHack Round 3 (Crypto) ja AlpacaHack Round 3 (Crypto)	last year

SOLVED CHALLENGES

CHALLENGE	SOLVES	SOLVED AT
strange filename Misc Daily AlpacaHack	113 solves	yesterday
Erased Secret Misc Daily AlpacaHack	75 solves	2 days ago
pacapaca sc Pwn Daily AlpacaHack	71 solves	3 days ago
Life is probably full of bugs Crypto Daily AlpacaHack B-SIDE	25 solves	3 days ago
AES is dead Crypto Daily AlpacaHack	86 solves	3 days ago
Panic Web Daily AlpacaHack	125 solves	5 days ago
1️⃣ Misc Daily AlpacaHack	155 solves	6 days ago
No Content Web Daily AlpacaHack	151 solves	last week
login-bonus-2 Pwn Daily AlpacaHack	86 solves	last week
The Horn Crypto Daily AlpacaHack	99 solves	last week
Perljail Misc Daily AlpacaHack B-SIDE	29 solves	last week
Impossible Puzzle Web Daily AlpacaHack	181 solves	last week
You are my friend Crypto Daily AlpacaHack	158 solves	last week
Message For You Web Daily AlpacaHack	189 solves	last week
Pyrunner Misc Daily AlpacaHack B-SIDE	38 solves	last week
silence Misc Daily AlpacaHack	99 solves	2 weeks ago
fsb-202 Pwn Daily AlpacaHack B-SIDE	40 solves	2 weeks ago
Tar Uploader Web Daily AlpacaHack	101 solves	2 weeks ago
Dot Chain Misc Daily AlpacaHack	84 solves	2 weeks ago
EncodeDecode Misc Daily AlpacaHack	86 solves	2 weeks ago
encrypted-p Crypto Daily AlpacaHack	101 solves	2 weeks ago
CRC-256 Crypto Daily AlpacaHack B-SIDE	31 solves	2 weeks ago
Optimized expression Rev Daily AlpacaHack	115 solves	2 weeks ago
crypto_666 Crypto Daily AlpacaHack	105 solves	2 weeks ago
What's Next Web Daily AlpacaHack	110 solves	3 weeks ago
The past or the future? Crypto Daily AlpacaHack B-SIDE	33 solves	3 weeks ago
bloom Crypto Daily AlpacaHack	86 solves	3 weeks ago
vuln4vuln Pwn Daily AlpacaHack	96 solves	3 weeks ago
Haec Horrenda Misc Daily AlpacaHack B-SIDE	29 solves	3 weeks ago
Alpacker Rev Daily AlpacaHack	78 solves	3 weeks ago
canary leak Pwn Daily AlpacaHack	106 solves	3 weeks ago
Flags for the FLAG Misc Daily AlpacaHack	150 solves	3 weeks ago
PPPPParse Misc Daily AlpacaHack	98 solves	3 weeks ago
Free Coupon Web Daily AlpacaHack	135 solves	4 weeks ago
The future path Crypto Daily AlpacaHack	92 solves	4 weeks ago
UOUO FISH JAIL Misc Daily AlpacaHack B-SIDE	38 solves	4 weeks ago
flag.txt Misc Daily AlpacaHack	111 solves	last month
Single Hint RSA Crypto tkbctf5	120 solves	last month
Double Hint RSA Crypto tkbctf5	30 solves	last month
README.pdf Rev tkbctf5	148 solves	last month
Heuristic IPPON Misc Daily AlpacaHack	168 solves	last month
memset note Pwn Daily AlpacaHack B-SIDE	45 solves	last month
Another Login Challenge Web Daily AlpacaHack	124 solves	last month
kappa overflow Pwn Daily AlpacaHack	121 solves	last month
Find XOR key Crypto Daily AlpacaHack	150 solves	last month
iwashi Crypto Daily AlpacaHack B-SIDE	38 solves	last month
💯 Misc Daily AlpacaHack	116 solves	last month
FLAG OVER Misc Daily AlpacaHack	115 solves	last month
guess.js Misc Daily AlpacaHack	103 solves	last month
high and low Crypto Daily AlpacaHack	87 solves	last month
magic number Misc Daily AlpacaHack	124 solves	last month
Resume Maker Web Daily AlpacaHack B-SIDE	53 solves	last month
Alert my Flag Web Daily AlpacaHack	168 solves	last month
Flag Printer 2026 Misc Daily AlpacaHack	206 solves	last month
glibc's secret function Rev Daily AlpacaHack	196 solves	last month
Bars Web Daily AlpacaHack	300 solves	last month
9️⃣ Misc Daily AlpacaHack B-SIDE	48 solves	last month
pyjs Misc Daily AlpacaHack	83 solves	last month
Rock Paper Scissors Lizard Spock Web Daily AlpacaHack	96 solves	last month
One Byte Padding Oracle Attack Crypto Daily AlpacaHack	74 solves	last month
useful-gadget Pwn Daily AlpacaHack B-SIDE	46 solves	last month
Alpaca Rangers Web Daily AlpacaHack	148 solves	last month
addprimes Crypto AlpacaHack Round 9 (Crypto)	27 solves	last month
hit-and-hit Misc Daily AlpacaHack	87 solves	last month
Iron Door Crypto CakeCTF 2023	7 solves	last month
Alpaca Quest Rev Daily AlpacaHack	115 solves	last month
dual_summon Crypto SECCON CTF 13 Quals	9 solves	last month
Tidal wave Crypto SECCON CTF 13 Quals	5 solves	last month
Noob programmer Pwn Daily AlpacaHack	105 solves	last month
xiyi Crypto SECCON CTF 13 Quals	3 solves	last month
seqr Crypto SECCON CTF 13 Quals	2 solves	last month
Stealerusk Rev Daily AlpacaHack B-SIDE	45 solves	last month
CopperCopperCopper Crypto Daily AlpacaHack	92 solves	last month
doloR Sit Amet Revenge Crypto	2 solves	last month
Dancing Cursor Rev Misc Daily AlpacaHack	109 solves	last month
doloR Sit Amet Crypto	2 solves	last month
Pickle Loader Misc Daily AlpacaHack	117 solves	last month
Disappeared Pwn Daily AlpacaHack	116 solves	last month
ECRSA Crypto Daily AlpacaHack B-SIDE	46 solves	last month
wages of sin() Rev Misc Daily AlpacaHack	94 solves	last month
Alpaillier Crypto Daily AlpacaHack	117 solves	last month
You are being redirected Web Daily AlpacaHack	114 solves	last month
simple ROP Pwn Daily AlpacaHack	114 solves	last month
ret2basics Pwn Daily AlpacaHack B-SIDE	44 solves	last month
nc magic Misc Daily AlpacaHack	133 solves	last month
AAAAAAAAEEEEEEEESSSSSSSS Crypto Daily AlpacaHack	121 solves	2 months ago
destructuring Misc Daily AlpacaHack	145 solves	2 months ago
Alpaca-Llama Ranch Pwn Daily AlpacaHack	125 solves	2 months ago
invisible-grep Misc Daily AlpacaHack B-SIDE	40 solves	2 months ago
Plz Login Web Daily AlpacaHack	226 solves	2 months ago
Compressor Misc Daily AlpacaHack	110 solves	2 months ago
misdirection Rev Daily AlpacaHack	163 solves	2 months ago
The World Misc Daily AlpacaHack	192 solves	2 months ago
HellCouple Crypto Daily AlpacaHack B-SIDE	70 solves	2 months ago
RRe_Time_Limiter Crypto Daily AlpacaHack	178 solves	2 months ago
Magic Engine Web Daily AlpacaHack	272 solves	2 months ago
read-a-binary Rev Daily AlpacaHack	226 solves	2 months ago
Substance Crypto Daily AlpacaHack	240 solves	2 months ago
Inu Profile Web Daily AlpacaHack B-SIDE	96 solves	2 months ago
optimal-sort Misc Daily AlpacaHack	104 solves	2 months ago
Linear Coffee Generator Crypto Daily AlpacaHack	115 solves	2 months ago
shellcode-101 Pwn Daily AlpacaHack	139 solves	2 months ago
No JS Web Daily AlpacaHack	132 solves	2 months ago
ToyPQC Crypto Daily AlpacaHack	108 solves	2 months ago
git gc Misc Daily AlpacaHack	155 solves	2 months ago
Stateless Auth Web Daily AlpacaHack	168 solves	2 months ago
Paca Paca Authenticator Crypto Daily AlpacaHack	128 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	202 solves	2 months ago
Base Length Misc Daily AlpacaHack	157 solves	2 months ago
Short Writer Pwn Daily AlpacaHack	124 solves	2 months ago
Five Alpacas Crypto Daily AlpacaHack	196 solves	2 months ago
free-comment Misc Daily AlpacaHack	152 solves	3 months ago
I wanna be the Admin Web Daily AlpacaHack	283 solves	3 months ago
Basic Buffer Overflow Pwn Daily AlpacaHack	186 solves	3 months ago
crazython Rev Daily AlpacaHack	188 solves	3 months ago
RSA2026 Crypto Daily AlpacaHack	209 solves	3 months ago
SwapSwap Misc Daily AlpacaHack	288 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	283 solves	3 months ago
Encoding Basics Misc Crypto Daily AlpacaHack	318 solves	3 months ago
Fushigi Crawler Web Daily AlpacaHack	346 solves	3 months ago
Ruby Flag Checker Rev Daily AlpacaHack	289 solves	3 months ago
super-tomato Crypto Daily AlpacaHack	390 solves	3 months ago
108 Misc Daily AlpacaHack	296 solves	3 months ago
RBG Crypto Daily AlpacaHack	124 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	158 solves	3 months ago
Xmas Login Web Daily AlpacaHack	354 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	225 solves	3 months ago
RSA debug? Crypto Daily AlpacaHack	192 solves	3 months ago
omikuji Web Daily AlpacaHack	249 solves	3 months ago
alloc-101 Pwn Daily AlpacaHack	218 solves	3 months ago
Twilight Rev Daily AlpacaHack	230 solves	3 months ago
login-bonus Pwn Daily AlpacaHack	255 solves	3 months ago
🐈 Web Daily AlpacaHack	310 solves	3 months ago
Flag Printer 2100 Rev Daily AlpacaHack	247 solves	4 months ago
power_obfus_royalty Rev Daily AlpacaHack	209 solves	4 months ago
Safe Prime Crypto SECCON Beginners CTF 2024	253 solves	4 months ago
Sugoi Flag Checker Rev Daily AlpacaHack	205 solves	4 months ago
Alpaca Bank Web Daily AlpacaHack	332 solves	4 months ago
Read Assembly Rev Daily AlpacaHack	313 solves	4 months ago
hit-and-miss Misc Daily AlpacaHack	387 solves	4 months ago
Fully Padded RSA Crypto Daily AlpacaHack	237 solves	4 months ago
size limit Crypto Daily AlpacaHack	317 solves	4 months ago
simpleoverflow Pwn SECCON Beginners CTF 2024	507 solves	4 months ago
Integer Writer Pwn Daily AlpacaHack	325 solves	4 months ago
Leaked Flag Checker Rev Daily AlpacaHack	569 solves	4 months ago
Emojify Web Daily AlpacaHack	594 solves	4 months ago
a fact of CTF Crypto Daily AlpacaHack	883 solves	4 months ago
AlpacaHack 2100 Misc Daily AlpacaHack	1639 solves	4 months ago
reiwa_rot13 Crypto SECCON CTF 13 Quals	29 solves	5 months ago
luau Rev CakeCTF 2022	34 solves	5 months ago
hidden Rev AlpacaHack Round 8 (Rev)	71 solves	5 months ago
masking tape Rev AlpacaHack Round 8 (Rev)	173 solves	5 months ago
RSAMPC Crypto AlpacaHack Round 9 (Crypto)	35 solves	5 months ago
Jerry's flag checker Crypto AlpacaHack Round 13 (Crypto)	33 solves	8 months ago
Flag Sharing Crypto AlpacaHack Round 12 (Crypto)	10 solves	9 months ago
OTEC Crypto AlpacaHack Round 12 (Crypto)	39 solves	9 months ago
RSARSARSARSARSARSA Crypto AlpacaHack Round 12 (Crypto)	79 solves	9 months ago
Jackpot Web AlpacaHack Round 11 (Web)	163 solves	11 months ago
Kangaroo Pwn AlpacaHack Round 10 (Pwn)	66 solves	last year
Oyster Pwn AlpacaHack Round 10 (Pwn)	129 solves	last year
minimal-waf Web AlpacaHack Round 7 (Web)	25 solves	last year
str.vs.cstr Pwn CakeCTF 2022	27 solves	last year
Alpaca Poll Web AlpacaHack Round 7 (Web)	129 solves	last year
Treasure Hunt Web AlpacaHack Round 7 (Web)	271 solves	last year
MathHash Misc zer0pts CTF 2022	4 solves	last year
Rock Door Crypto CakeCTF 2022	10 solves	last year
janken vs yoshiking 2 Crypto CakeCTF 2023	16 solves	last year
NNNN Crypto AlpacaHack Round 5 (Crypto)	50 solves	last year
miniblog++ Web zer0pts CTF 2022	11 solves	last year
OpenBio Web CakeCTF 2022	21 solves	last year
Warmuprofile Web zer0pts CTF 2023	28 solves	last year
Elliptic Ring RSA Crypto zer0pts CTF 2023	5 solves	last year
Modern Rome Pwn zer0pts CTF 2022	24 solves	last year
CurveCrypto Crypto zer0pts CTF 2022	7 solves	last year
readme 2022 Misc CakeCTF 2022	14 solves	last year
SquareRNG Crypto zer0pts CTF 2023	15 solves	last year
Anti-Fermat Crypto zer0pts CTF 2022	30 solves	last year
easy_factoring Crypto zer0pts CTF 2023	29 solves	last year
aush Pwn zer0pts CTF 2023	22 solves	last year
TOWFL Web Cheat CakeCTF 2023	51 solves	last year
decompile me Rev zer0pts CTF 2023	48 solves	last year
GitFile Explorer Web zer0pts CTF 2022	48 solves	last year
vtable4b Pwn CakeCTF 2023	61 solves	last year
nimrev Rev CakeCTF 2022	79 solves	last year
CakeGEAR Web CakeCTF 2022	81 solves	last year
read-write Pwn RTACTF 2023 Spring	41 solves	last year
write Pwn RTACTF 2023 Spring	85 solves	last year
before-write Pwn RTACTF 2023 Spring	162 solves	last year
catcpy Pwn AlpacaHack Round 6 (Pwn)	146 solves	last year
inbound Pwn AlpacaHack Round 6 (Pwn)	207 solves	last year
SchnorrLCG Crypto AlpacaHack Round 5 (Crypto)	23 solves	last year
XorshiftStream Crypto AlpacaHack Round 5 (Crypto)	65 solves	last year
Simple Flag Checker Rev AlpacaHack Round 4 (Rev)	127 solves	last year
Hat Trick Crypto AlpacaHack Round 3 (Crypto)	66 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)	124 solves	last year
qrime Crypto AlpacaHack Round 3 (Crypto)	253 solves	last year
brand new crypto Crypto CakeCTF 2022	25 solves	last year
simple signature Crypto CakeCTF 2023	28 solves	last year
ding-dong-ting-ping Crypto CakeCTF 2023	10 solves	last year
CaaS Web AlpacaHack Round 2 (Web)	93 solves	last year
Simple Login Web AlpacaHack Round 2 (Web)	612 solves	last year
Pico Note 1 Web AlpacaHack Round 2 (Web)	81 solves	last year
hexecho Pwn AlpacaHack Round 1 (Pwn)	114 solves	last year
echo Pwn AlpacaHack Round 1 (Pwn)	357 solves	last year
frozen cake Crypto CakeCTF 2022	71 solves	last year
Country DB Web CakeCTF 2023	224 solves	last year
Reused-AES Crypto RTACTF 2023 Spring	33 solves	last year
Collision-DES Crypto RTACTF 2023 Spring	37 solves	last year
XOR-CBC Crypto RTACTF 2023 Spring	77 solves	last year
Welcome Misc	1546 solves	last year

Only archived challenges are displayed here.