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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.

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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
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28
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29
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30
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1
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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:

Greetings i18n

Topic: PythonReleased: Jul 26, 2026

75 solves
Web
Hard6.5

by

tchen

tchen

USER

SOLVED AT

curetwinkle

curetwinkle

2026/10/02 13:32

2026/09/29 08:35

2026/09/05 03:58

2026/08/29 00:59

2026/08/28 12:19

2026/08/26 12:28

2026/08/24 17:31

2026/08/23 14:54

2026/08/23 07:34

2026/08/22 15:28

2026/08/22 10:29

2026/08/22 08:55

2026/08/22 08:02

2026/08/21 01:36

2026/08/20 23:59

2026/08/20 17:37

2026/08/20 15:17

2026/08/13 17:10

2026/08/04 09:30

2026/08/01 10:02

2026/08/01 05:05

2026/07/29 11:08

2026/07/28 15:15

2026/07/28 10:42

2026/07/28 10:41

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descriptionsolveswriteups