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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
haihuiliyuyuan
typhoon-pythoon
Rev
Medium
8 solves
Submissions (latest 3)
rsk0315

SOLVED!

Sep 24, 6:39 PM

kurgm

SOLVED!

Sep 24, 4:07 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🌱
2,219 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🌱
132 solves
2
hiikunzhiikunz
base 16-32-64
Misc
Easy🌱
107 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
71 solves
16-18
edwowmathedwowmath
neighboRhood_diStAnce
Crypto
Hard
42 solves
19-21
hiikunzhiikunz
nested eval
Misc
Hard
48 solves
 
hiikunzhiikunz
nested eval
Misc
Hard
48 solves
22-24
2501
The 3rd
Crypto
Hard
36 solves
25-26
haihuiliyuyuan
typhoon-pythoon
Rev
Medium
8 solves
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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4
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Writeups

Small Image Uploader 2 Writeup

sota70

ja
Small Image Uploader 2

16 hours ago

Rows:

Alpaca Rangers

Topic: LFIReleased: Feb 25, 2026

214 solves
Web
Medium3.0

by

tchen

tchen

USER

SOLVED AT

sp1n0z4

sp1n0z4

2026/09/14 15:28

2026/09/11 05:17

2026/09/10 13:25

2026/09/09 18:37

2026/09/04 14:49

2026/09/03 17:36

2026/09/02 22:47

2026/08/30 07:22

2026/08/29 09:05

2026/08/26 11:52

2026/08/25 04:28

2026/08/23 09:52

2026/08/20 18:26

2026/08/17 05:39

2026/08/13 04:39

2026/08/11 19:17

2026/08/11 12:31

2026/08/01 11:58

2026/07/27 23:48

2026/07/27 23:48

2026/07/25 14:59

2026/07/24 13:01

2026/07/23 11:58

2026/07/21 10:59

2026/07/10 08:44

Rows:

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