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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! Selected problems from external CTFs are released occasionally.

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

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Today's Challenge
hiikunz
Five Alpacas
Crypto
Easy
58 solves
Submissions (latest 3)
ksan

SOLVED!

23:52:37

Leaderboard
1.
bsvac
15 solves
40.
14 solves
152.
4 solves
172.
3 solves
193.
2 solves
234.
1 solve

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
982 solves
Topics and categories are revealed in advance for upcoming challenges.
Prev

Jan 2026

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Mon
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29
kanon
one-p-rsa
Crypto
Easy
177 solves
30
soon-haari
RBG
Crypto
Very Hard
110 solves
31
admin
108
Misc
Easy
207 solves
1
admin
Happy New Year
Misc
Welcome
345 solves
2
kanon
super-tomato
Crypto
Easy
248 solves
3
hiikunz
Ruby Flag Checker
Rev
Easy
200 solves
4
minaminao
Fushigi Crawler
Web
Easy
221 solves
5
kurenaif
Encoding Basics
Crypto
Misc
Easy
205 solves
6
minaminao
jailiaj
Misc
Easy
197 solves
7
hiikunz
Square RSA
Crypto
Medium
177 solves
8
ark
secret-table
Web
Medium
189 solves
9
hiikunz
SwapSwap
Misc
Easy
205 solves
10
theoremoon
RSA2026
Crypto
Medium
163 solves
11
keymoon
crazython
Rev
Medium
146 solves
12
hiikunz
Basic Buffer Overflow
Pwn
Medium
126 solves
13
tchen
I wanna be the Admin
Web
Easy
157 solves
14
ark
free-comment
Misc
Hard
105 solves
15
hiikunz
Five Alpacas
Crypto
Easy
58 solves
16
k0080
Planned topicOut-of-Bounds Write
Pwn
Hard
17
Planned topicEncoding
Misc
Medium
18
Planned topicServer-Side
Web
Medium
19
Planned topicStream Cipher
Crypto
Medium
20
Planned topicSIMD
Rev
Hard
21
Planned topicDocker
Misc
Easy
22
Planned topicClient-Side
Web
Medium
23
Planned topicJail
Misc
Hard
24
Planned topicAES
Crypto
Medium
25
Planned topicJWT
Web
Medium
26
Coming soon
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
31
Coming soon
1
Coming soon

Writeups

Writeup for I wanna be the Admin

yamarin

ja
I wanna be the Admin

21 hours ago

Writeup for I wanna be the Admin

Writeup for I wanna be the Admin

Writeup for Basic Buffer Overflow

Writeup for Basic Buffer Overflow

Writeup for Basic Buffer Overflow

Writeup for crazython

ja

2 days ago

Rows:

AlpacaHack 2100

Topic: Welcome

982 solves
Misc
Welcome

Author:

admin

🦙 < The flag is on the Jan 2100 calendar of Daily AlpacaHack.

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