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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.
Prev

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
Coming soon
4
Coming soon

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Writeups

Writeup for flag obfuscation

enesbasmaci

en
flag obfuscation

3 hours ago

Rows:

permission denied 3

Topic: File PermissionReleased: May 7, 2026

121 solves
Misc
Medium5.5

by

minaminao

minaminao

USER

SOLVED AT

bigmc1971

2026/08/25 02:48

2026/06/18 11:40

2026/06/13 10:51

2026/06/13 07:24

2026/06/08 09:24

2026/05/25 13:35

2026/05/23 17:04

2026/05/23 13:59

2026/05/23 11:36

2026/05/21 14:21

2026/05/21 05:57

2026/05/19 14:25

2026/05/19 14:20

2026/05/17 04:32

2026/05/14 18:52

2026/05/13 10:29

2026/05/11 11:45

2026/05/10 16:31

2026/05/10 13:50

2026/05/10 12:50

2026/05/09 16:35

2026/05/09 09:24

2026/05/09 08:08

2026/05/09 02:04

2026/05/08 12:32

Rows:

descriptionsolveswriteups