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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🌱
2,215 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
Coming soon
2
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3
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4
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Writeups

Writeup for nested eval

baumroll1234

ja
nested eval

23 hours ago

Rows:

Let's Shut Down Linux

Topic: System CallReleased: Sep 3, 2026

63 solves
Misc
Medium2.5

by

tan90909090

tan90909090

USER

SOLVED AT

syougotea

2026/09/20 03:34

2026/09/19 05:41

2026/09/18 03:49

2026/09/15 12:45

2026/09/15 12:19

2026/09/15 06:16

2026/09/13 05:45

2026/09/12 21:05

2026/09/09 13:47

2026/09/08 15:25

2026/09/08 02:16

2026/09/07 15:29

2026/09/07 06:19

2026/09/05 15:07

2026/09/05 06:13

2026/09/05 03:08

2026/09/04 14:48

2026/09/04 13:45

2026/09/04 13:07

2026/09/04 12:22

2026/09/04 11:47

2026/09/04 10:59

2026/09/04 04:00

2026/09/04 03:27

2026/09/04 01:25

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