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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
10 solves
Submissions (latest 3)
toomer

SOLVED!

Sep 21, 6:49 PM

kakur41

SOLVED!

Sep 21, 6:27 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🌱
2,213 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🌱
125 solves
2
hiikunzhiikunz
base 16-32-64
Misc
Easy🌱
101 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
69 solves
16-18
edwowmathedwowmath
neighboRhood_diStAnce
Crypto
Hard
41 solves
19-21
hiikunzhiikunz
nested eval
Misc
Hard
39 solves
 
hiikunzhiikunz
nested eval
Misc
Hard
39 solves
22-24
2501
The 3rd
Crypto
Hard
10 solves
25
Coming soon
26
Coming soon
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
1
Coming soon
2
Coming soon
3
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4
Coming soon

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Writeups

Writeup for flag obfuscation

enesbasmaci

en
flag obfuscation

2 hours ago

Rows:

RFC100008

Topic: HTTPReleased: Jul 27, 2026

155 solves
Web
Easy🌱3.0

by

tchen

tchen

USER

SOLVED AT

hiro-rm-rf

2026/09/11 06:02

2026/09/10 17:23

2026/09/10 09:37

2026/09/10 06:49

2026/09/08 23:39

2026/09/08 04:28

2026/09/04 22:48

2026/09/04 06:23

2026/09/02 13:20

2026/09/01 12:16

2026/08/30 13:56

2026/08/30 00:13

2026/08/29 14:35

2026/08/24 09:06

2026/08/23 10:12

2026/08/23 08:23

2026/08/23 06:42

2026/08/23 04:03

2026/08/22 12:09

2026/08/22 03:55

2026/08/19 08:23

2026/08/19 03:31

2026/08/18 07:17

2026/08/18 05:41

2026/08/17 23:19

Rows:

descriptionsolveswriteups