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Daily AlpacaHack

A daily CTF challenge with a fun new puzzle every day

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

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Today's Challenge
pppp4649pppp4649
Only forward
Pwn
Hard
2 solves
Submissions (latest 3)
blackade

SOLVED!

Jun 27, 3:15 PM

hiikunz
hiikunz

SOLVED!

Jun 27, 3:13 PM

Leaderboard

Try the first challenge

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

View challenge
admin
AlpacaHack 2100
Misc
Welcome🌱
1,920 solves
Upcoming challenges reveal the , , and in advance.
Prev

Jun 2026

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Upcoming
Mon
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Thu
Fri
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Sun
1
admin
Half-Year Recap
Misc
Welcome🌱
248 solves
2
minaminaominaminao
Cache Me If You Can
Web
Easy🌱
209 solves
3
minaminaominaminao
vm1
Misc
Medium
101 solves
4
pppp4649pppp4649
Small e
Crypto
Easy🌱
140 solves
5
minaminaominaminao
RPS GAME
Misc
Crypto
Medium
100 solves
6
nozokare
Flag for localhost
Web
Easy🌱
176 solves
7
tan90909090tan90909090
C++ flag checker
Rev
Hard
87 solves
8
shiragishiragi
Guess IP
Misc
Easy🌱
145 solves
9
nozokare
A Piece of DHKE
Crypto
Medium
83 solves
10
shiragishiragi
chmod-swapper
Misc
Medium
86 solves
11
tchentchen
Alpaca Certification
Web
Easy🌱
162 solves
12
rsk0315
Floating Equality
Misc
Medium
92 solves
13
pppp4649pppp4649
Elliptic Equation
Crypto
Hard
61 solves
14
tchentchen
CAuth
Web
Hard
70 solves
15
minaminaominaminao
SITE/2
Web
Easy🌱
123 solves
16
tan90909090tan90909090
Xored PNG
Misc
Medium
88 solves
17
tchentchen
Looks like Alpacahack
Web
Medium
84 solves
18
shiragishiragi
Catrunner 2
Misc
Easy🌱
108 solves
19
minaminaominaminao
Flag Printer 20XX
Misc
Medium
63 solves
20
nozokare
xorshift521
Crypto
Hard
54 solves
21
k0080k0080
what-is-my-size
Pwn
Hard
65 solves
22
minaminaominaminao
✌️✌️✌️
Crypto
Easy🌱
89 solves
23
tchentchen
Secret Renderer
Web
Medium
82 solves
24
kanonkanon
honk the klaxon
Crypto
Medium
58 solves
25
colza
voyage
Misc
Easy🌱
91 solves
26
rsk0315
Decimal float 101.0
Misc
Medium
64 solves
27
bubububu
Style Your Alpaca
Web
Hard
52 solves
28
pppp4649pppp4649
Only forward
Pwn
Hard
2 solves
29
Coming soon
30
Coming soon
1
admin
Planned topicWelcome
Misc
Welcome🌱
2
hiikunzhiikunz
Planned topicMathematics
Crypto
Easy🌱
3
Coming soon
4
hiikunzhiikunz
Planned topicJavaScript
Rev
Medium
5
Coming soon

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Writeups

Daily AlpacaHackに挑戦するつくよみちゃん 06/15/SITE/2/minaminao

tsukuyomi-chan

ja
SITE/2

2 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 06/14/CAuth/tchen

tsukuyomi-chan

ja
CAuth

3 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 06/13/Elliptic Equation/pppp4649

tsukuyomi-chan

ja
Elliptic Equation

5 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 06/12/Floating Equality/rsk0315

tsukuyomi-chan

ja
Floating Equality

6 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 06/26/Decimal float 101.0/rsk0315

tsukuyomi-chan

ja
Decimal float 101.0

20 hours ago

nitcelcius

Writeup for Decimal float 101.0

nitcelcius

ja
Decimal float 101.0

22 hours ago

Writeup for No JS

00xcanelo

en
No JS

2026/06/26 07:35

Daily AlpacaHackに挑戦するつくよみちゃん 06/25/voyage/colza

tsukuyomi-chan

ja
voyage

2026/06/25 15:54

Writeup for honk the klaxon

baumroll1234

ja
honk the klaxon

2026/06/24 20:02

Writeup for honk the klaxon

goroshirow

ja
honk the klaxon

2026/06/24 15:33

Rows:

curl as a service

Topic: curlReleased: May 15, 2026

126 solves
WebMisc
Medium5.0

by

tan90909090

tan90909090

This is a service that executes curl command!

Beginner Hint
  • curl command is often used for HTTP protocol communication. However, it actually supports a variety of protocols.
  • In this challenge, there is a flag in a container that serving an SSH service. Let's search how to use an SSH protocol from curl command.
curl-as-a-service.tar.gz

Please sign in to submit the flag.

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