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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🌱
38 solves
Submissions (latest 3)
kapumoka

SOLVED!

Oct 24, 12:39 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🌱
2,301 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🌱
155 solves
2
tan90909090tan90909090
C# File-based app
Rev
Easy🌱
76 solves
3-4
2501
Shared Prime
Crypto
Medium
87 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
60 solves
15-18
hiikunzhiikunz
decreasing
Misc
Hard
34 solves
19-22
tan90909090tan90909090
x32 ABI flag checker
Rev
Hard
31 solves
23-24
pppp4649pppp4649
Σecret
Crypto
Easy🌱
38 solves
25-28
k0080k0080
Planned topicmalloc
Pwn
Hard
 
Planned topicmalloc
Pwn
Hard
29
Coming soon
30
Coming soon
31
Coming soon
1
Coming soon

Want a harder challenge?

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Writeups

tadanobutubutu

Writeup for x32 ABI flag checker

tadanobutubutu

ja
x32 ABI flag checker

2026/10/23 11:18

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

Rows:

Bounds Checking

Topic: Out-of-Bounds WriteReleased: May 10, 2026

100 solves
Pwn
Hard7.5

by

rsk0315

USER

SOLVED AT

ramveil

2026/10/17 10:48

2026/10/14 10:19

2026/09/25 05:41

2026/08/22 04:20

2026/07/18 12:51

2026/07/15 09:14

2026/07/08 12:33

2026/06/20 11:07

2026/06/19 02:45

2026/06/17 10:29

2026/06/04 14:16

2026/05/31 15:34

2026/05/26 00:49

2026/05/25 10:24

2026/05/23 12:26

2026/05/23 07:18

2026/05/21 02:57

2026/05/15 08:11

2026/05/15 03:56

2026/05/14 18:13

2026/05/12 11:18

2026/05/11 15:40

2026/05/11 11:40

2026/05/11 11:29

2026/05/11 08:41

Rows:

descriptionsolveswriteups