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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
2501
Lean as a Service
Misc
Medium
5 solves
Submissions (latest 3)
edwowmath
edwowmath

SOLVED!

Oct 28, 4:12 PM

hiikunz

SOLVED!

Oct 28, 3:36 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🌱
2,321 solves
Upcoming challenges reveal the , , and in advance.
Prev

Oct 2026

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k0080k0080
what is my pointer 2
Pwn
Hard
49 solves
1
admin
Baby Alpaca
Misc
Welcome🌱
168 solves
2
tan90909090tan90909090
C# File-based app
Rev
Easy🌱
81 solves
3-4
2501
Shared Prime
Crypto
Medium
90 solves
5-8
tan90909090tan90909090
fsbase modification
Pwn
Hard
62 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
61 solves
15-18
hiikunzhiikunz
decreasing
Misc
Hard
34 solves
19-22
tan90909090tan90909090
x32 ABI flag checker
Rev
Hard
32 solves
23-24
pppp4649pppp4649
Σecret
Crypto
Easy🌱
45 solves
25-28
k0080k0080
what is my pointer 4
Pwn
Hard
32 solves
 
k0080k0080
what is my pointer 4
Pwn
Hard
32 solves
29-31
2501
Lean as a Service
Misc
Medium
5 solves
1
Coming soon

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Writeups

Writeup for IP Blocked Secret

umachaba

ja
IP Blocked Secret

2026/10/27 08:42

tadanobutubutu

Writeup for Σecret

ja

2026/10/24 16:37

tadanobutubutu

Writeup for x32 ABI flag checker

Rows:

Almost Shared Prime

Topic: RSAReleased: Oct 9, 2026

44 solves
Crypto
Hard8.5

by

2501

USER

SOLVED AT

andante1666

2026/10/22 07:56

2026/10/19 18:31

2026/10/15 10:53

2026/10/15 08:03

2026/10/13 13:01

2026/10/13 06:14

2026/10/12 14:53

2026/10/12 08:31

2026/10/12 08:02

2026/10/12 04:27

2026/10/11 11:32

2026/10/11 06:58

2026/10/11 04:55

2026/10/10 18:08

2026/10/10 17:05

2026/10/10 13:07

2026/10/10 04:59

2026/10/10 02:42

2026/10/10 02:23

2026/10/09 19:33

2026/10/09 14:01

2026/10/09 13:00

2026/10/09 12:38

2026/10/09 06:06

2026/10/09 03:48

Rows:

descriptionsolveswriteups