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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
The 3rd
Crypto
Hard
25 solves
Submissions (latest 3)
prof

SOLVED!

Sep 22, 3:03 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🌱
2,214 solves
Upcoming challenges reveal the , , and in advance.
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Sep 2026

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tchentchen
Springing
Web
Medium
74 solves
1
admin
QUIZ ALPACASHOCK
Misc
Welcome🌱
126 solves
2
hiikunzhiikunz
base 16-32-64
Misc
Easy🌱
102 solves
3-4
tan90909090tan90909090
Let's Shut Down Linux
Misc
Medium
63 solves
5
baumroll1234
6-8
minaminaominaminao
Bitflip RSA
Crypto
Hard
56 solves
 
minaminaominaminao
Bitflip RSA
Crypto
Hard
56 solves
9-11
minaminaominaminao
\^o^/
Misc
Hard
43 solves
12-13
tan90909090tan90909090
sin function vs. fsin instruction
Rev
Misc
Medium
55 solves
14-15
tan90909090tan90909090
integer division
Misc
Medium
70 solves
16-18
edwowmathedwowmath
neighboRhood_diStAnce
Crypto
Hard
41 solves
19-21
hiikunzhiikunz
nested eval
Misc
Hard
43 solves
 
hiikunzhiikunz
nested eval
Misc
Hard
43 solves
22-24
2501
The 3rd
Crypto
Hard
25 solves
25
Coming soon
26
Coming soon
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
1
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2
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3
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Writeups

Writeup for nested eval

baumroll1234

ja
nested eval

18 hours ago

Rows:

Impossible Puzzle

Topic: PHPReleased: Apr 4, 2026

289 solves
Web
Easy🌱3.0

by

hiikunz

hiikunz

USER

SOLVED AT

alirezarst

2026/09/16 09:17

2026/09/14 04:47

2026/09/14 02:02

2026/09/11 01:31

2026/09/09 15:22

2026/09/08 13:42

2026/09/03 04:21

2026/09/02 18:00

2026/08/23 10:48

2026/08/23 05:18

2026/08/22 11:16

2026/08/15 17:15

2026/08/13 20:51

2026/08/13 03:27

2026/08/10 05:30

2026/08/08 15:42

2026/08/08 13:30

2026/08/08 10:45

2026/08/06 11:01

2026/08/06 10:18

2026/08/05 01:36

2026/07/31 10:33

2026/07/27 19:32

2026/07/24 11:00

2026/07/22 14:55

Rows:

descriptionsolveswriteups