@yu212 - AlpacaHack

yu212

@Yu_212_MC

AUTHORED CHALLENGES

OPEN DATE	CHALLENGE	SOLVES
2026/01/29	Linear Coffee Generator Crypto	106 solves
2026/01/23	Paca Paca Authenticator Crypto	118 solves
2025/12/16	doloR Sit Amet Crypto	2 solves
2025/12/16	Noisy Channel Crypto	1 solve
2025/12/16	doloR Sit Amet Revenge Crypto	2 solves
2025/12/07	Fully Padded RSA Crypto	222 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	4 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	3 weeks ago
Author's Writeup for Linear Coffee Generator ja official Linear Coffee Generator	last month
Author's Writeup for Paca Paca Authenticator ja official Paca Paca Authenticator	last month
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	8 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
magic number Misc Daily AlpacaHack	81 solves	yesterday
Alert my Flag Web Daily AlpacaHack	103 solves	2 days ago
9️⃣ Misc Daily AlpacaHack B-SIDE	39 solves	3 days ago
Flag Printer 2026 Misc Daily AlpacaHack	128 solves	3 days ago
glibc's secret function Rev Daily AlpacaHack	130 solves	4 days ago
Bars Web Daily AlpacaHack	167 solves	5 days ago
pyjs Misc Daily AlpacaHack	76 solves	last week
Rock Paper Scissors Lizard Spock Web Daily AlpacaHack	85 solves	last week
One Byte Padding Oracle Attack Crypto Daily AlpacaHack	67 solves	last week
useful-gadget Pwn Daily AlpacaHack B-SIDE	42 solves	last week
Alpaca Rangers Web Daily AlpacaHack	129 solves	last week
hit-and-hit Misc Daily AlpacaHack	78 solves	last week
Alpaca Quest Rev Daily AlpacaHack	104 solves	last week
Noob programmer Pwn Daily AlpacaHack	92 solves	last week
Stealerusk Rev Daily AlpacaHack B-SIDE	40 solves	2 weeks ago
CopperCopperCopper Crypto Daily AlpacaHack	85 solves	2 weeks ago
Dancing Cursor Rev Misc Daily AlpacaHack	100 solves	2 weeks ago
Pickle Loader Misc Daily AlpacaHack	109 solves	2 weeks ago
Disappeared Pwn Daily AlpacaHack	104 solves	2 weeks ago
ECRSA Crypto Daily AlpacaHack B-SIDE	45 solves	2 weeks ago
wages of sin() Rev Misc Daily AlpacaHack	85 solves	2 weeks ago
Alpaillier Crypto Daily AlpacaHack	108 solves	2 weeks ago
ret2basics Pwn Daily AlpacaHack B-SIDE	39 solves	2 weeks ago
You are being redirected Web Daily AlpacaHack	107 solves	2 weeks ago
simple ROP Pwn Daily AlpacaHack	98 solves	2 weeks ago
nc magic Misc Daily AlpacaHack	121 solves	3 weeks ago
AAAAAAAAEEEEEEEESSSSSSSS Crypto Daily AlpacaHack	109 solves	3 weeks ago
invisible-grep Misc Daily AlpacaHack B-SIDE	37 solves	3 weeks ago
destructuring Misc Daily AlpacaHack	129 solves	3 weeks ago
Alpaca-Llama Ranch Pwn Daily AlpacaHack	113 solves	3 weeks ago
Plz Login Web Daily AlpacaHack	197 solves	3 weeks ago
Compressor Misc Daily AlpacaHack	101 solves	3 weeks ago
misdirection Rev Daily AlpacaHack	143 solves	4 weeks ago
The World Misc Daily AlpacaHack	169 solves	4 weeks ago
HellCouple Crypto Daily AlpacaHack B-SIDE	65 solves	last month
RRe_Time_Limiter Crypto Daily AlpacaHack	163 solves	last month
Magic Engine Web Daily AlpacaHack	232 solves	last month
read-a-binary Rev Daily AlpacaHack	198 solves	last month
Substance Crypto Daily AlpacaHack	222 solves	last month
Inu Profile Web Daily AlpacaHack B-SIDE	85 solves	last month
optimal-sort Misc Daily AlpacaHack	96 solves	last month
Linear Coffee Generator Crypto Daily AlpacaHack	106 solves	last month
shellcode-101 Pwn Daily AlpacaHack	120 solves	last month
No JS Web Daily AlpacaHack	123 solves	last month
ToyPQC Crypto Daily AlpacaHack	101 solves	last month
git gc Misc Daily AlpacaHack	141 solves	last month
Stateless Auth Web Daily AlpacaHack	156 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	143 solves	last month
dockerstack Misc Daily AlpacaHack	170 solves	last month
system-v Rev Daily AlpacaHack	114 solves	last month
ChaChaCha Crypto Daily AlpacaHack	150 solves	last month
dice roll Web Daily AlpacaHack	188 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	181 solves	last month
free-comment Misc Daily AlpacaHack	144 solves	last month
I wanna be the Admin Web Daily AlpacaHack	251 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	193 solves	last month
SwapSwap Misc Daily AlpacaHack	256 solves	last month
secret-table Web Daily AlpacaHack	247 solves	last month
Square RSA Crypto Daily AlpacaHack	216 solves	last month
jailiaj Misc Daily AlpacaHack	259 solves	2 months ago
Encoding Basics Misc Crypto Daily AlpacaHack	285 solves	2 months ago
Fushigi Crawler Web Daily AlpacaHack	305 solves	2 months ago
Ruby Flag Checker Rev Daily AlpacaHack	264 solves	2 months ago
super-tomato Crypto Daily AlpacaHack	344 solves	2 months ago
108 Misc Daily AlpacaHack	265 solves	2 months ago
RBG Crypto Daily AlpacaHack	118 solves	2 months ago
one-p-rsa Crypto Daily AlpacaHack	209 solves	2 months ago
cha-ll-enge Rev Daily AlpacaHack	143 solves	2 months ago
simpleoverwrite Pwn Daily AlpacaHack	176 solves	2 months ago
Useful Machine Rev Daily AlpacaHack	150 solves	2 months ago
Xmas Login Web Daily AlpacaHack	305 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	212 solves	2 months ago
RSA debug? Crypto Daily AlpacaHack	179 solves	2 months ago
omikuji Web Daily AlpacaHack	228 solves	2 months ago
alloc-101 Pwn Daily AlpacaHack	202 solves	2 months ago
Twilight Rev Daily AlpacaHack	214 solves	2 months ago
login-bonus Pwn Daily AlpacaHack	232 solves	2 months ago
🐈 Web Daily AlpacaHack	286 solves	2 months ago
Flag Printer 2100 Rev Daily AlpacaHack	230 solves	2 months ago
power_obfus_royalty Rev Daily AlpacaHack	194 solves	2 months ago
Safe Prime Crypto Daily AlpacaHack	240 solves	2 months ago
Sugoi Flag Checker Rev Daily AlpacaHack	192 solves	2 months ago
Alpaca Bank Web Daily AlpacaHack	302 solves	2 months ago
Read Assembly Rev Daily AlpacaHack	291 solves	2 months ago
hit-and-miss Misc Daily AlpacaHack	348 solves	2 months ago
Fully Padded RSA Crypto Daily AlpacaHack	222 solves	2 months ago
size limit Crypto Daily AlpacaHack	287 solves	3 months ago
simpleoverflow Pwn Daily AlpacaHack	450 solves	3 months ago
Integer Writer Pwn Daily AlpacaHack	291 solves	3 months ago
Leaked Flag Checker Rev Daily AlpacaHack	506 solves	3 months ago
Emojify Web Daily AlpacaHack	525 solves	3 months ago
a fact of CTF Crypto Daily AlpacaHack	772 solves	3 months ago
AlpacaHack 2100 Misc Daily AlpacaHack	1349 solves	3 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
Redirector Web AlpacaHack Round 11 (Web)	30 solves	9 months ago
Jackpot Web AlpacaHack Round 11 (Web)	159 solves	9 months ago
Kangaroo Pwn AlpacaHack Round 10 (Pwn)	66 solves	11 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)	27 solves	last year
subway Rev AlpacaHack Round 8 (Rev)	16 solves	last year
vcipher Rev AlpacaHack Round 8 (Rev)	29 solves	last year
hidden Rev AlpacaHack Round 8 (Rev)	71 solves	last year
masking tape Rev AlpacaHack Round 8 (Rev)	173 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
catcpy Pwn AlpacaHack Round 6 (Pwn)	144 solves	last year
inbound Pwn AlpacaHack Round 6 (Pwn)	204 solves	last year
GitFile Explorer Web zer0pts CTF 2022	47 solves	last year
Modern Rome Pwn zer0pts CTF 2022	24 solves	last year
Anti-Fermat Crypto zer0pts CTF 2022	30 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)	65 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
ding-dong-ting-ping Crypto CakeCTF 2023	9 solves	last year
janken vs yoshiking 2 Crypto CakeCTF 2023	16 solves	last year
brand new crypto Crypto CakeCTF 2022	24 solves	last year
luau Rev CakeCTF 2022	34 solves	last year
CakeGEAR Web CakeCTF 2022	79 solves	last year
CaaS Web AlpacaHack Round 2 (Web)	92 solves	last year
Pico Note 1 Web AlpacaHack Round 2 (Web)	80 solves	last year
Simple Login Web AlpacaHack Round 2 (Web)	588 solves	last year
hexecho Pwn AlpacaHack Round 1 (Pwn)	112 solves	last year
echo Pwn AlpacaHack Round 1 (Pwn)	345 solves	last year
Cake Puzzle Rev CakeCTF 2023	20 solves	last year
mimikyu Rev zer0pts CTF 2023	15 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	160 solves	last year
Reused-AES Crypto RTACTF 2023 Spring	33 solves	last year
XOR-CBC Crypto RTACTF 2023 Spring	76 solves	last year
Welcome Misc	1457 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	50 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	79 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.