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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

2 hours ago

Rows:

Flag Printer 2026

Topic: NetworkReleased: Mar 4, 2026

262 solves
Misc
Easy🌱3.0

by

minaminao

minaminao

USER

SOLVED AT

uskemor

2026/09/16 10:50

2026/09/07 19:22

2026/09/04 12:29

2026/09/02 18:48

2026/09/01 14:25

2026/08/25 15:22

2026/08/25 11:20

2026/08/25 03:06

2026/08/23 03:23

2026/08/20 23:44

2026/08/15 03:21

2026/08/12 04:46

2026/08/06 15:46

2026/08/06 13:51

2026/08/06 13:14

2026/08/05 14:14

2026/08/05 01:44

2026/08/04 04:20

2026/08/04 02:10

2026/08/03 12:44

2026/08/03 07:01

2026/08/03 02:31

2026/08/03 00:15

2026/08/02 18:10

2026/08/02 16:54

Rows:

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