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Daily AlpacaHack

A CTF challenge series with fun puzzles to enjoy every day

What is Daily AlpacaHack?

We regularly publish simple, beginner-friendly or educational CTF challenges!

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Solve each challenge within its time window to appear on the leaderboard.

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Today's Challenge
pppp4649pppp4649
Σecret
Crypto
Easy🌱
9 solves
Submissions (latest 3)
54n43n32n21

SOLVED!

Oct 22, 3:53 PM

a01sa01to

SOLVED!

Oct 22, 3:46 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🌱
2,300 solves
Upcoming challenges reveal the , , and in advance.
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Oct 2026

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k0080k0080
what is my pointer 2
Pwn
Hard
47 solves
1
admin
Baby Alpaca
Misc
Welcome🌱
154 solves
2
tan90909090tan90909090
C# File-based app
Rev
Easy🌱
76 solves
3-4
2501
Shared Prime
Crypto
Medium
86 solves
5-8
tan90909090tan90909090
fsbase modification
Pwn
Hard
59 solves
9-12
2501
Almost Shared Prime
Crypto
Hard
44 solves
 
2501
Almost Shared Prime
Crypto
Hard
44 solves
13-14
tan90909090tan90909090
cowsay jail
Misc
Medium
58 solves
15-18
hiikunzhiikunz
decreasing
Misc
Hard
34 solves
19-22
tan90909090tan90909090
x32 ABI flag checker
Rev
Hard
28 solves
23-24
pppp4649pppp4649
Σecret
Crypto
Easy🌱
9 solves
25
Coming soon
26
Coming soon
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
31
Coming soon
1
Coming soon

Want a harder challenge?

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Writeups

Writeup for Mirage

haruhana

ja
Mirage

15 hours ago

ojun

Writeup for fsbase modification

ja

2026/10/15 13:59

tadanobutubutu

Writeup for cowsay jail

ja

2026/10/15 08:42

tadanobutubutu

Writeup for Almost Shared Prime

nirvana

Writeup for cowsay jail

ja

2026/10/14 21:19

Rows:

Rate My Alpaca

Topic: File UploadReleased: Apr 22, 2026

111 solves
Web
Medium5.5

by

tchen

tchen

USER

SOLVED AT

nikto

2026/10/21 11:31

2026/10/14 13:44

2026/10/12 13:26

2026/10/12 06:17

2026/09/28 10:12

2026/09/17 09:42

2026/09/08 07:08

2026/08/29 11:26

2026/08/26 14:34

2026/08/26 08:04

2026/08/12 13:56

2026/07/02 09:46

2026/06/28 13:06

2026/06/28 08:22

2026/05/28 17:48

2026/05/21 07:08

2026/05/18 16:51

2026/05/16 00:47

2026/05/12 16:09

2026/05/12 01:28

2026/05/06 01:51

2026/05/05 11:30

2026/05/03 23:00

2026/05/01 14:41

2026/04/29 12:16

Rows:

descriptionsolveswriteups