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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
31 solves
Submissions (latest 3)
yahari

SOLVED!

Sep 23, 1:09 PM

sp1n0z4

SOLVED!

Sep 23, 12:34 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🌱
2,217 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🌱
127 solves
2
hiikunzhiikunz
base 16-32-64
Misc
Easy🌱
103 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
42 solves
19-21
hiikunzhiikunz
nested eval
Misc
Hard
45 solves
 
hiikunzhiikunz
nested eval
Misc
Hard
45 solves
22-24
2501
The 3rd
Crypto
Hard
31 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 nested eval

baumroll1234

ja
nested eval

2026/09/21 23:48

Rows:

Alpaca meets QR

Topic: Welcome, SECCONReleased: Mar 1, 2026

366 solves
Misc
Welcome🌱1.5

by

admin

USER

SOLVED AT

oyus

2026/09/11 09:27

2026/08/29 06:20

2026/08/09 21:23

2026/08/06 05:37

2026/08/04 02:44

2026/08/03 12:01

2026/07/31 09:51

2026/07/31 09:19

2026/07/29 03:30

2026/07/23 06:10

2026/07/17 06:50

2026/07/12 08:28

2026/07/04 01:13

2026/07/01 02:05

2026/06/30 11:08

2026/06/14 04:51

2026/06/13 07:19

2026/06/12 16:36

2026/06/08 18:11

2026/06/08 11:22

2026/06/08 09:08

2026/06/07 07:44

2026/06/06 11:23

2026/06/02 12:58

2026/06/01 03:07

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