Daily AlpacaHack

毎日1問、CTFの問題を腕試しできる常設チャレンジ

Daily AlpacaHack とは

初心者に楽しんでもらえるようなシンプルな問題・教育的問題を毎日1問出題します。

いつでも参加可能

出題から24時間以内に解くとリーダーボードに反映されます。

競技ではありません

友人やAIと話し合いながら解いてもOKです（アカウント共有は禁止です）。

解法共有のルール

出題から24時間後に解法の公開・閲覧ができます。

Solves 統計

/136 問

まだ正解した問題がありません。

プレイヤー統計を閲覧するには Sign In してください

今日のチャレンジ

提出（最新3件）

SOLVED!

Apr 14, 4:46 PM

rsk0315

SOLVED!

Apr 14, 4:39 PM

tmidry

SOLVED!

Apr 14, 4:07 PM

リーダーボード

期間

最初の問題に挑戦しよう

CTF は初めてですか？まずは Daily AlpacaHack で最初に出題された問題を解いてみましょう

これから公開予定の問題は「」「」「」を先出ししています。

前の月

2026年3月

次の月

解答済み

未解答

公開予定

月

火

水

木

金

土

日

kakur41

Alpaca Quest

Rev

Medium

115 solves

minaminao

hit-and-hit

Misc

Hard

87 solves

tchen

Alpaca Rangers

Web

Medium

149 solves

kurenaif

One Byte Padding Oracle Attack

Crypto

Hard

74 solves

tchen

Rock Paper Scissors Lizard Spock

Web

Hard

97 solves

minaminao

pyjs

Misc

Hard

83 solves

admin

Alpaca meets QR

Misc

Welcome🔰

308 solves

kakur41

Bars

Web

Easy🔰

301 solves

tan90909090

glibc's secret function

Rev

Easy🔰

197 solves

minaminao

Flag Printer 2026

Misc

Easy🔰

207 solves

tchen

Alert my Flag

Web

Medium

169 solves

mora

magic number

Misc

Medium

124 solves

theoremoon

high and low

Crypto

Hard

87 solves

ark

guess.js

Misc

Hard

103 solves

minaminao

FLAG OVER

Misc

Medium

115 solves

ark

💯

Misc

Medium

116 solves

pppp4649

Find XOR key

Crypto

Easy🔰

150 solves

colza

kappa overflow

Pwn

Medium

121 solves

tchen

Another Login Challenge

Web

Medium

125 solves

asusn

Heuristic IPPON

Misc

Easy🔰

168 solves

minaminao

flag.txt

Misc

Hard

111 solves

pppp4649

The future path

Crypto

Medium

92 solves

tchen

Free Coupon

Web

Medium

136 solves

ark

PPPPParse

Misc

Medium

98 solves

rsk0315

Flags for the FLAG

Misc

Easy🔰

150 solves

colza

canary leak

Pwn

Medium

106 solves

chocorusk

Alpacker

Rev

Hard

78 solves

k0080

vuln4vuln

Pwn

Hard

96 solves

kanon

bloom

Crypto

Medium

86 solves

tchen

What's Next

Web

Medium

111 solves

kurenaif

crypto_666

Crypto

Medium

105 solves

tan90909090

Optimized expression

Rev

Easy🔰

115 solves

minaminao

encrypted-p

Crypto

Medium

101 solves

hiikunz

EncodeDecode

Misc

Hard

86 solves

tchen

Dot Chain

Misc

Hard

84 solves

tchen

Tar Uploader

Web

Medium

102 solves

blackade

silence

Misc

Medium

99 solves

admin

OSINT

Misc

Welcome🔰

290 solves

tchen

Message For You

Web

Easy🔰

194 solves

pppp4649

You are my friend

Crypto

Easy🔰

159 solves

hiikunz

Impossible Puzzle

Web

Easy🔰

184 solves

kanon

The Horn

Crypto

Medium

99 solves

もっと高難易度の問題を解きたい方へ

B-SIDE を見る

Writeups

Writeup for wither tadanobutubutu ja wither 1 hour ago
Writeup for strange filename paulayground ko strange filename 10 hours ago
Writeup for strange filename tadanobutubutu ja strange filename 22 hours ago
Writeup for Erased Secret nozokare ja Erased Secret yesterday
Writeup for pacapaca sc nozokare ja pacapaca sc yesterday
Writeup for Erased Secret baumroll1234 ja Erased Secret yesterday
Writeup for Impossible Puzzle takitaro ja Impossible Puzzle 2 days ago
Writeup for Erased Secret tadanobutubutu ja Erased Secret 2 days ago
Writeup for Daily AlpacaHack 4/5-4/11 kakur41 ja AES is dead +6 2 days ago
Writeup for pacapaca sc tadanobutubutu ja pacapaca sc 2 days ago

Rows:

Paca Paca Authenticator

Topic: AESReleased: Jan 24, 2026

128 solves

Crypto

Medium

Author:

yu212

USER	SOLVED AT
ryuun1corn	13 hours ago
ito	last week
kanon	last week
over20	2 weeks ago
koufu193	2 weeks ago
stepbystepbymyself	3 weeks ago
kurenaif	3 weeks ago
manzokumaboroshi	3 weeks ago
popopo	last month
kapumoka	last month
unity	last month
thr246	last month
labpump	last month
j0k3r	2 months ago
mavil27	2 months ago
ost	2 months ago
ctf-udon	2 months ago
lydxn	2 months ago
enmity	2 months ago
nzt3	2 months ago
qlich	2 months ago
hoveneko	2 months ago
kudaliar	2 months ago
yag	2 months ago
ret1n4	2 months ago

Rows:

description solves writeups