@yu212 - AlpacaHack

yu212

@Yu_212_MC

AUTHORED CHALLENGES

OPEN DATE	CHALLENGE	SOLVES
2025/12/07	Fully Padded RSA Crypto	163 solves
2025/07/06	RSARSARSARSARSARSA Crypto	68 solves
2025/07/06	Flag Sharing Crypto	9 solves
2025/07/06	OTEC Crypto	35 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 Fully Padded RSA ja official Fully Padded RSA	last week
AlpacaHack Round 12 (Crypto) 作問者writeup ja official RSARSARSARSARSARSA	5 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
Flag Printer 2100 Rev Daily AlpacaHack	142 solves	2 hours ago
power_obfus_royalty Rev Daily AlpacaHack	132 solves	yesterday
Safe Prime Crypto Daily AlpacaHack	167 solves	2 days ago
Sugoi Flag Checker Rev Daily AlpacaHack	138 solves	3 days ago
Alpaca Bank Web Daily AlpacaHack	191 solves	5 days ago
Read Assembly Rev Daily AlpacaHack	193 solves	5 days ago
hit-and-miss Misc Daily AlpacaHack	216 solves	6 days ago
Fully Padded RSA Crypto Daily AlpacaHack	163 solves	last week
size limit Crypto Daily AlpacaHack	194 solves	last week
simpleoverflow Pwn Daily AlpacaHack	274 solves	last week
Integer Writer Pwn Daily AlpacaHack	193 solves	last week
Leaked Flag Checker Rev Daily AlpacaHack	304 solves	last week
Emojify Web Daily AlpacaHack	329 solves	last week
a fact of CTF Crypto Daily AlpacaHack	471 solves	last week
AlpacaHack 2100 Misc Daily AlpacaHack	677 solves	2 weeks ago
Polynomial Puzzle Crypto AlpacaHack Round 13 (Crypto)	3 solves	4 months ago
Jerr0-day Crypto AlpacaHack Round 13 (Crypto)	9 solves	4 months ago
Jerry's flag checker Crypto AlpacaHack Round 13 (Crypto)	25 solves	4 months ago
Redirector Web AlpacaHack Round 11 (Web)	27 solves	7 months ago
Jackpot Web AlpacaHack Round 11 (Web)	141 solves	7 months ago
Kangaroo Pwn AlpacaHack Round 10 (Pwn)	58 solves	8 months ago
ffmac Crypto AlpacaHack Round 9 (Crypto)	8 solves	10 months ago
Equivalent Privacy Wired Crypto AlpacaHack Round 9 (Crypto)	7 solves	10 months ago
RSAMPC Crypto AlpacaHack Round 9 (Crypto)	32 solves	10 months ago
addprimes Crypto AlpacaHack Round 9 (Crypto)	24 solves	10 months ago
subway Rev AlpacaHack Round 8 (Rev)	13 solves	11 months ago
vcipher Rev AlpacaHack Round 8 (Rev)	24 solves	11 months ago
hidden Rev AlpacaHack Round 8 (Rev)	64 solves	11 months ago
masking tape Rev AlpacaHack Round 8 (Rev)	161 solves	11 months ago
Alpaca Poll Web AlpacaHack Round 7 (Web)	116 solves	last year
Treasure Hunt Web AlpacaHack Round 7 (Web)	248 solves	last year
catcpy Pwn AlpacaHack Round 6 (Pwn)	133 solves	last year
inbound Pwn AlpacaHack Round 6 (Pwn)	188 solves	last year
GitFile Explorer Web zer0pts CTF 2022	40 solves	last year
Modern Rome Pwn zer0pts CTF 2022	20 solves	last year
Anti-Fermat Crypto zer0pts CTF 2022	24 solves	last year
NNNN Crypto AlpacaHack Round 5 (Crypto)	44 solves	last year
SchnorrLCG Crypto AlpacaHack Round 5 (Crypto)	18 solves	last year
XorshiftStream Crypto AlpacaHack Round 5 (Crypto)	56 solves	last year
Everything Silver Rev AlpacaHack Round 4 (Rev)	22 solves	last year
pytecode Rev AlpacaHack Round 4 (Rev)	22 solves	last year
Simple Flag Checker Rev AlpacaHack Round 4 (Rev)	118 solves	last year
A Dance of Add and Mul Crypto AlpacaHack Round 3 (Crypto)	69 solves	last year
Hat Trick Crypto AlpacaHack Round 3 (Crypto)	58 solves	last year
Rainbow Sweet Alchemist Crypto AlpacaHack Round 3 (Crypto)	111 solves	last year
qrime Crypto AlpacaHack Round 3 (Crypto)	230 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	20 solves	last year
luau Rev CakeCTF 2022	31 solves	last year
CakeGEAR Web CakeCTF 2022	73 solves	last year
CaaS Web AlpacaHack Round 2 (Web)	87 solves	last year
Pico Note 1 Web AlpacaHack Round 2 (Web)	72 solves	last year
Simple Login Web AlpacaHack Round 2 (Web)	512 solves	last year
hexecho Pwn AlpacaHack Round 1 (Pwn)	107 solves	last year
echo Pwn AlpacaHack Round 1 (Pwn)	313 solves	last year
Cake Puzzle Rev CakeCTF 2023	19 solves	last year
mimikyu Rev zer0pts CTF 2023	13 solves	last year
read-write Pwn RTACTF 2023 Spring	37 solves	last year
1R-AES Crypto RTACTF 2023 Spring	15 solves	last year
Collision-DES Crypto RTACTF 2023 Spring	33 solves	last year
write Pwn RTACTF 2023 Spring	79 solves	last year
before-write Pwn RTACTF 2023 Spring	146 solves	last year
Reused-AES Crypto RTACTF 2023 Spring	30 solves	last year
XOR-CBC Crypto RTACTF 2023 Spring	70 solves	last year
Welcome Misc	1248 solves	last year
SquareRNG Crypto zer0pts CTF 2023	13 solves	last year
easy_factoring Crypto zer0pts CTF 2023	25 solves	last year
TOWFL Cheat Web CakeCTF 2023	46 solves	last year
decompile me Rev zer0pts CTF 2023	42 solves	last year
vtable4b Pwn CakeCTF 2023	55 solves	last year
nimrev Rev CakeCTF 2022	71 solves	last year
bofww Pwn CakeCTF 2023	34 solves	last year
frozen cake Crypto CakeCTF 2022	63 solves	last year
simple signature Crypto CakeCTF 2023	24 solves	last year
Country DB Web CakeCTF 2023	205 solves	last year

Only archived challenges are displayed here.