@yu212 - AlpacaHack

yu212

@Yu_212_MC

AUTHORED CHALLENGES

OPEN DATE	CHALLENGE	SOLVES
2026/01/29	Linear Coffee Generator Crypto	103 solves
2026/01/23	Paca Paca Authenticator Crypto	114 solves
2025/12/16	doloR Sit Amet Crypto	1 solve
2025/12/16	Noisy Channel Crypto	1 solve
2025/12/16	doloR Sit Amet Revenge Crypto	1 solve
2025/12/07	Fully Padded RSA Crypto	214 solves
2025/07/06	RSARSARSARSARSARSA Crypto	79 solves
2025/07/06	Flag Sharing Crypto	9 solves
2025/07/06	OTEC Crypto	39 solves
2025/07/06	Zero-sum game Crypto	3 solves

CTF HISTORY

START DATE	CTF	RANK
2025/07/20	AlpacaHack Round 13 (Crypto)	8 / 62
2025/05/17	AlpacaHack Round 11 (Web)	13 / 213
2025/03/23	AlpacaHack Round 10 (Pwn)	43 / 95
2025/03/01	SECCON CTF 13 決勝観戦CTF	101 / 233
2025/01/26	AlpacaHack Round 9 (Crypto)	20 / 138
2024/12/30	AlpacaHack Round 8 (Rev)	5 / 316
2024/11/30	AlpacaHack Round 7 (Web)	79 / 458
2024/11/03	AlpacaHack Round 6 (Pwn)	46 / 197
2024/10/12	AlpacaHack Round 5 (Crypto)	8 / 247
2024/09/15	AlpacaHack Round 3 (Crypto)	6 / 239
2024/09/01	AlpacaHack Round 2 (Web)	18 / 300
2024/08/18	AlpacaHack Round 1 (Pwn)	33 / 174

WRITEUPS

WRITEUP	CREATED AT
Writeup for HellCouple ja HellCouple	2 days ago
Author's Writeup for Linear Coffee Generator ja official Linear Coffee Generator	last week
Author's Writeup for Paca Paca Authenticator ja official Paca Paca Authenticator	2 weeks ago
Writeup for Fully Padded RSA ja official Fully Padded RSA	2 months ago
AlpacaHack Round 12 (Crypto) 作問者writeup ja official Flag Sharing	7 months ago
Writeup for AlpacaHack Round 3 (Crypto) ja AlpacaHack Round 3 (Crypto)	last year
frozen cake 初心者向け解説 ja frozen cake	last year

SOLVED CHALLENGES

CHALLENGE	SOLVES	SOLVED AT
destructuring Misc Daily AlpacaHack	104 solves	yesterday
Alpaca-Llama Ranch Pwn Daily AlpacaHack	94 solves	2 days ago
Plz Login Web Daily AlpacaHack	148 solves	3 days ago
Compressor Misc Daily AlpacaHack	91 solves	4 days ago
misdirection Rev Daily AlpacaHack	117 solves	5 days ago
The World Misc Daily AlpacaHack	134 solves	6 days ago
HellCouple Crypto Daily AlpacaHack B-SIDE	61 solves	last week
RRe_Time_Limiter Crypto Daily AlpacaHack	136 solves	last week
Magic Engine Web Daily AlpacaHack	172 solves	last week
read-a-binary Rev Daily AlpacaHack	161 solves	last week
Substance Crypto Daily AlpacaHack	170 solves	last week
Inu Profile Web Daily AlpacaHack B-SIDE	81 solves	last week
optimal-sort Misc Daily AlpacaHack	91 solves	last week
Linear Coffee Generator Crypto Daily AlpacaHack	103 solves	last week
shellcode-101 Pwn Daily AlpacaHack	116 solves	2 weeks ago
No JS Web Daily AlpacaHack	115 solves	2 weeks ago
ToyPQC Crypto Daily AlpacaHack	99 solves	2 weeks ago
git gc Misc Daily AlpacaHack	138 solves	2 weeks ago
Stateless Auth Web Daily AlpacaHack	146 solves	2 weeks ago
Paca Paca Authenticator Crypto Daily AlpacaHack	114 solves	2 weeks ago
Bashrunner Misc Daily AlpacaHack	112 solves	2 weeks ago
Animal Viewer Web Daily AlpacaHack	134 solves	3 weeks ago
dockerstack Misc Daily AlpacaHack	161 solves	3 weeks ago
system-v Rev Daily AlpacaHack	112 solves	3 weeks ago
ChaChaCha Crypto Daily AlpacaHack	146 solves	3 weeks ago
dice roll Web Daily AlpacaHack	172 solves	3 weeks ago
Base Length Misc Daily AlpacaHack	138 solves	3 weeks ago
Short Writer Pwn Daily AlpacaHack	112 solves	3 weeks ago
Five Alpacas Crypto Daily AlpacaHack	164 solves	4 weeks ago
free-comment Misc Daily AlpacaHack	142 solves	4 weeks ago
I wanna be the Admin Web Daily AlpacaHack	214 solves	last month
Basic Buffer Overflow Pwn Daily AlpacaHack	157 solves	last month
crazython Rev Daily AlpacaHack	164 solves	last month
RSA2026 Crypto Daily AlpacaHack	186 solves	last month
SwapSwap Misc Daily AlpacaHack	235 solves	last month
secret-table Web Daily AlpacaHack	227 solves	last month
Square RSA Crypto Daily AlpacaHack	205 solves	last month
jailiaj Misc Daily AlpacaHack	236 solves	last month
Encoding Basics Misc Crypto Daily AlpacaHack	263 solves	last month
Fushigi Crawler Web Daily AlpacaHack	274 solves	last month
Ruby Flag Checker Rev Daily AlpacaHack	245 solves	last month
super-tomato Crypto Daily AlpacaHack	314 solves	last month
108 Misc Daily AlpacaHack	248 solves	last month
RBG Crypto Daily AlpacaHack	116 solves	last month
one-p-rsa Crypto Daily AlpacaHack	194 solves	last month
cha-ll-enge Rev Daily AlpacaHack	138 solves	last month
simpleoverwrite Pwn Daily AlpacaHack	170 solves	last month
Useful Machine Rev Daily AlpacaHack	146 solves	last month
Xmas Login Web Daily AlpacaHack	282 solves	last month
cat3 Misc Daily AlpacaHack	197 solves	last month
Rotten Beef Pwn Daily AlpacaHack	178 solves	last month
Log Viewer Web Daily AlpacaHack	203 solves	last month
RSA debug? Crypto Daily AlpacaHack	171 solves	last month
omikuji Web Daily AlpacaHack	215 solves	last month
alloc-101 Pwn Daily AlpacaHack	195 solves	last month
Twilight Rev Daily AlpacaHack	203 solves	last month
login-bonus Pwn Daily AlpacaHack	220 solves	last month
🐈 Web Daily AlpacaHack	268 solves	last month
Flag Printer 2100 Rev Daily AlpacaHack	215 solves	last month
power_obfus_royalty Rev Daily AlpacaHack	185 solves	2 months ago
Safe Prime Crypto Daily AlpacaHack	230 solves	2 months ago
Sugoi Flag Checker Rev Daily AlpacaHack	185 solves	2 months ago
Alpaca Bank Web Daily AlpacaHack	284 solves	2 months ago
Read Assembly Rev Daily AlpacaHack	272 solves	2 months ago
hit-and-miss Misc Daily AlpacaHack	307 solves	2 months ago
Fully Padded RSA Crypto Daily AlpacaHack	214 solves	2 months ago
size limit Crypto Daily AlpacaHack	275 solves	2 months ago
simpleoverflow Pwn Daily AlpacaHack	415 solves	2 months ago
Integer Writer Pwn Daily AlpacaHack	279 solves	2 months ago
Leaked Flag Checker Rev Daily AlpacaHack	468 solves	2 months ago
Emojify Web Daily AlpacaHack	492 solves	2 months ago
a fact of CTF Crypto Daily AlpacaHack	712 solves	2 months ago
AlpacaHack 2100 Misc Daily AlpacaHack	1174 solves	2 months ago
Polynomial Puzzle Crypto AlpacaHack Round 13 (Crypto)	4 solves	6 months ago
Jerr0-day Crypto AlpacaHack Round 13 (Crypto)	12 solves	6 months ago
Jerry's flag checker Crypto AlpacaHack Round 13 (Crypto)	30 solves	6 months ago
Redirector Web AlpacaHack Round 11 (Web)	29 solves	9 months ago
Jackpot Web AlpacaHack Round 11 (Web)	157 solves	9 months ago
Kangaroo Pwn AlpacaHack Round 10 (Pwn)	64 solves	10 months ago
ffmac Crypto AlpacaHack Round 9 (Crypto)	8 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
addprimes Crypto AlpacaHack Round 9 (Crypto)	26 solves	last year
subway Rev AlpacaHack Round 8 (Rev)	16 solves	last year
vcipher Rev AlpacaHack Round 8 (Rev)	28 solves	last year
hidden Rev AlpacaHack Round 8 (Rev)	71 solves	last year
masking tape Rev AlpacaHack Round 8 (Rev)	170 solves	last year
Alpaca Poll Web AlpacaHack Round 7 (Web)	128 solves	last year
Treasure Hunt Web AlpacaHack Round 7 (Web)	265 solves	last year
catcpy Pwn AlpacaHack Round 6 (Pwn)	142 solves	last year
inbound Pwn AlpacaHack Round 6 (Pwn)	202 solves	last year
GitFile Explorer Web zer0pts CTF 2022	46 solves	last year
Modern Rome Pwn zer0pts CTF 2022	24 solves	last year
Anti-Fermat Crypto zer0pts CTF 2022	29 solves	last year
NNNN Crypto AlpacaHack Round 5 (Crypto)	47 solves	last year
SchnorrLCG Crypto AlpacaHack Round 5 (Crypto)	22 solves	last year
XorshiftStream Crypto AlpacaHack Round 5 (Crypto)	62 solves	last year
Everything Silver Rev AlpacaHack Round 4 (Rev)	26 solves	last year
pytecode Rev AlpacaHack Round 4 (Rev)	26 solves	last year
Simple Flag Checker Rev AlpacaHack Round 4 (Rev)	125 solves	last year
A Dance of Add and Mul Crypto AlpacaHack Round 3 (Crypto)	74 solves	last year
Hat Trick Crypto AlpacaHack Round 3 (Crypto)	64 solves	last year
Rainbow Sweet Alchemist Crypto AlpacaHack Round 3 (Crypto)	122 solves	last year
qrime Crypto AlpacaHack Round 3 (Crypto)	245 solves	last year
ding-dong-ting-ping Crypto CakeCTF 2023	9 solves	last year
janken vs yoshiking 2 Crypto CakeCTF 2023	15 solves	last year
brand new crypto Crypto CakeCTF 2022	23 solves	last year
luau Rev CakeCTF 2022	33 solves	last year
CakeGEAR Web CakeCTF 2022	77 solves	last year
CaaS Web AlpacaHack Round 2 (Web)	91 solves	last year
Pico Note 1 Web AlpacaHack Round 2 (Web)	79 solves	last year
Simple Login Web AlpacaHack Round 2 (Web)	564 solves	last year
hexecho Pwn AlpacaHack Round 1 (Pwn)	111 solves	last year
echo Pwn AlpacaHack Round 1 (Pwn)	339 solves	last year
Cake Puzzle Rev CakeCTF 2023	20 solves	last year
mimikyu Rev zer0pts CTF 2023	14 solves	last year
read-write Pwn RTACTF 2023 Spring	41 solves	last year
1R-AES Crypto RTACTF 2023 Spring	17 solves	last year
Collision-DES Crypto RTACTF 2023 Spring	37 solves	last year
write Pwn RTACTF 2023 Spring	85 solves	last year
before-write Pwn RTACTF 2023 Spring	158 solves	last year
Reused-AES Crypto RTACTF 2023 Spring	32 solves	last year
XOR-CBC Crypto RTACTF 2023 Spring	76 solves	last year
Welcome Misc	1415 solves	last year
SquareRNG Crypto zer0pts CTF 2023	14 solves	last year
easy_factoring Crypto zer0pts CTF 2023	29 solves	last year
TOWFL Web Cheat CakeCTF 2023	49 solves	last year
decompile me Rev zer0pts CTF 2023	48 solves	last year
vtable4b Pwn CakeCTF 2023	61 solves	last year
nimrev Rev CakeCTF 2022	78 solves	last year
bofww Pwn CakeCTF 2023	38 solves	last year
frozen cake Crypto CakeCTF 2022	70 solves	last year
simple signature Crypto CakeCTF 2023	28 solves	last year
Country DB Web CakeCTF 2023	220 solves	last year

Only archived challenges are displayed here.