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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🌱
11 solves
Submissions (latest 3)
mak0tan

SOLVED!

Oct 22, 7:35 PM

kurgm

SOLVED!

Oct 22, 7:10 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
59 solves
15-18
hiikunzhiikunz
decreasing
Misc
Hard
34 solves
19-22
tan90909090tan90909090
x32 ABI flag checker
Rev
Hard
29 solves
23-24
pppp4649pppp4649
Σecret
Crypto
Easy🌱
11 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

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Writeups

Writeup for Mirage

haruhana

ja
Mirage

18 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:

private method

Topic: PythonReleased: Jul 9, 2026

173 solves
Misc
Easy🌱2.5

by

shiragi

shiragi

USER

SOLVED AT

haruhana

2026/10/19 01:30

2026/10/18 09:19

2026/10/05 16:03

2026/10/02 14:09

2026/09/28 13:25

2026/09/26 04:59

2026/09/21 13:22

2026/09/13 01:57

2026/09/05 06:04

2026/08/29 12:41

2026/08/28 14:52

2026/08/27 04:03

2026/08/23 01:13

2026/08/22 11:47

2026/08/21 08:53

2026/08/20 06:17

2026/08/17 14:12

2026/08/14 13:48

2026/08/13 12:30

2026/08/13 08:16

2026/08/11 15:33

2026/08/11 10:03

2026/08/06 11:01

2026/08/05 02:45

2026/08/04 01:06

Rows:

descriptionsolveswriteups