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Daily AlpacaHack

A daily CTF challenge with a fun new puzzle every day

What is Daily AlpacaHack?

We publish one simple, beginner-friendly or educational CTF challenge every day!

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Solve within 24 hours of release to appear on the leaderboard.

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Today's Challenge
kanonkanon
honk the klaxon
Crypto
Medium
34 solves
Submissions (latest 3)
pppp4649
pppp4649

SOLVED!

Jun 24, 5:08 AM

Leaderboard

Try the first challenge

Is this your first CTF? Let's begin by tackling the first challenge released on Daily AlpacaHack.

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admin
AlpacaHack 2100
Misc
Welcome🌱
1,909 solves
Upcoming challenges reveal the , , and in advance.
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Jun 2026

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1
admin
Half-Year Recap
Misc
Welcome🌱
237 solves
2
minaminaominaminao
Cache Me If You Can
Web
Easy🌱
199 solves
3
minaminaominaminao
vm1
Misc
Medium
95 solves
4
pppp4649pppp4649
Small e
Crypto
Easy🌱
134 solves
5
minaminaominaminao
RPS GAME
Misc
Crypto
Medium
96 solves
6
nozokare
Flag for localhost
Web
Easy🌱
156 solves
7
tan90909090tan90909090
C++ flag checker
Rev
Hard
84 solves
8
shiragishiragi
Guess IP
Misc
Easy🌱
140 solves
9
nozokare
A Piece of DHKE
Crypto
Medium
81 solves
10
shiragishiragi
chmod-swapper
Misc
Medium
84 solves
11
tchentchen
Alpaca Certification
Web
Easy🌱
154 solves
12
rsk0315
Floating Equality
Misc
Medium
89 solves
13
pppp4649pppp4649
Elliptic Equation
Crypto
Hard
59 solves
14
tchentchen
CAuth
Web
Hard
65 solves
15
minaminaominaminao
SITE/2
Web
Easy🌱
117 solves
16
tan90909090tan90909090
Xored PNG
Misc
Medium
84 solves
17
tchentchen
Looks like Alpacahack
Web
Medium
80 solves
18
shiragishiragi
Catrunner 2
Misc
Easy🌱
103 solves
19
minaminaominaminao
Flag Printer 20XX
Misc
Medium
61 solves
20
nozokare
xorshift521
Crypto
Hard
54 solves
21
k0080k0080
what-is-my-size
Pwn
Hard
63 solves
22
minaminaominaminao
✌️✌️✌️
Crypto
Easy🌱
84 solves
23
tchentchen
Secret Renderer
Web
Medium
69 solves
24
kanonkanon
honk the klaxon
Crypto
Medium
34 solves
25
colza
Planned topicArchive
Misc
Easy🌱
26
Coming soon
28
Planned topicTBA
Pwn
Hard
29
Coming soon
30
Coming soon
2
Planned topicMathematics
Crypto
Easy🌱
3
Coming soon
4
Coming soon
5
Coming soon

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Writeups

Daily AlpacaHackに挑戦するつくよみちゃん 06/23/Secret Renderer/tchen

tsukuyomi-chan

ja
Secret Renderer

14 hours ago

minaminao

Writeup for ✌️✌️✌️

author
ja

2026/06/22 17:14

Daily AlpacaHackに挑戦するつくよみちゃん 06/22/✌️✌️✌️/minaminao

tadanobutubutu

Writeup for ✌️✌️✌️

tadanobutubutu

Writeup for what-is-my-size

Daily AlpacaHackに挑戦するつくよみちゃん 06/20/xorshift521/nozokare

ja

2026/06/20 15:40

Rows:

Basic Buffer Overflow

Topic: Buffer OverflowReleased: Jan 12, 2026

208 solves
Pwn
Medium5.5

by

hiikunz

hiikunz

USER

SOLVED AT

tadanobutubutu

tadanobutubutu

2026/06/19 20:16

2026/06/19 10:56

2026/06/16 11:02

2026/06/16 10:58

2026/06/16 08:44

2026/06/16 02:38

2026/06/14 11:33

2026/06/12 02:51

2026/05/28 13:44

2026/05/27 08:30

2026/05/26 06:45

2026/05/25 08:24

2026/05/24 14:03

2026/05/17 02:57

2026/05/10 02:50

2026/05/09 18:48

2026/05/06 06:28

2026/05/01 16:08

2026/05/01 10:40

2026/04/29 13:48

2026/04/25 07:52

2026/04/22 12:21

2026/04/09 13:40

2026/04/06 05:53

2026/04/04 13:59

Rows:

descriptionsolveswriteups