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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
minaminaominaminao
Bitflip RSA
Crypto
Hard
25 solves
Submissions (latest 3)
reid

SOLVED!

Sep 6, 10:13 AM

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🌱
2,185 solves
Upcoming challenges reveal the , , and in advance.
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Sep 2026

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tchentchen
Springing
Web
Medium
67 solves
1
admin
QUIZ ALPACASHOCK
Misc
Welcome🌱
93 solves
2
hiikunzhiikunz
base 16-32-64
Misc
Easy🌱
71 solves
3-4
tan90909090tan90909090
Let's Shut Down Linux
Misc
Medium
50 solves
5
baumroll1234
6-8
minaminaominaminao
Bitflip RSA
Crypto
Hard
25 solves
 
minaminaominaminao
Bitflip RSA
Crypto
Hard
25 solves
9
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Want a harder challenge?

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Writeups

nitcelcius

Writeup for Vending Machine: Revised Version (warn: some code reading ahead)

nitcelcius

ja
Vending Machine: Revised Version

4 hours ago

nitcelcius

Writeup for Let's Shut Down Linux (with reading)

curetwinkle

Writeup for Springing

ja

2026/09/05 05:10

tchen

Writeup for Xwitter

author
en

2026/08/29 05:39

Rows:

Xmas Login

Topic: SQLReleased: Dec 25, 2025

489 solves
Web
Easy🌱2.0

by

hiikunz

hiikunz

USER

SOLVED AT

m4k0

14 hours ago

2026/09/04 13:35

2026/09/01 19:22

2026/08/30 01:26

2026/08/27 10:51

2026/08/26 09:03

2026/08/24 07:55

2026/08/22 23:39

2026/08/22 09:04

2026/08/22 02:19

2026/08/21 14:55

2026/08/20 17:27

2026/08/19 05:04

2026/08/19 01:03

2026/08/17 14:15

2026/08/16 07:11

2026/08/16 07:04

2026/08/15 16:52

2026/08/15 08:17

2026/08/15 06:54

2026/08/14 20:34

2026/08/14 13:02

2026/08/13 07:01

2026/08/13 03:07

2026/08/12 17:32

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descriptionsolveswriteups