AlpacaHack Logo
Sign InSign Up
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!

Join Anytime

Solve each challenge within its time window to appear on the leaderboard.

Not a Competition

Discussion with friends or AI is welcome (account sharing is prohibited).

Solution Sharing Rules

Sharing solutions is allowed only after the challenge period has ended.

Solve stats

0

/11

No solved challenges yet.

Sign In to view your player stats

Today's Challenge
2501
The 3rd
Crypto
Hard
12 solves
Submissions (latest 3)
gin

SOLVED!

Sep 21, 11:06 PM

edwowmath

SOLVED!

Sep 21, 10:27 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

Next
Solved
Unsolved
Upcoming
Mon
Tue
Wed
Thu
Fri
Sat
Sun
 
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
12 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

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for nested eval

baumroll1234

ja
nested eval

2 hours ago

Rows:

Super Short System Exit

Topic: PythonReleased: Jun 30, 2026

92 solves
Misc
Medium5.5

by

minaminao

minaminao

USER

SOLVED AT

akiaki96

2026/09/10 04:31

2026/08/26 04:20

2026/08/20 20:30

2026/08/11 21:11

2026/08/09 17:03

2026/08/09 01:08

2026/08/08 18:38

2026/08/06 12:50

2026/07/27 15:28

2026/07/21 21:52

2026/07/14 10:52

2026/07/14 09:38

2026/07/14 05:56

2026/07/10 15:33

2026/07/08 11:37

2026/07/05 00:49

2026/07/03 12:54

2026/07/03 10:49

2026/07/03 09:57

2026/07/03 08:51

2026/07/03 01:15

2026/07/02 12:38

2026/07/02 04:58

2026/07/01 15:33

2026/07/01 13:56

Rows:

descriptionsolveswriteups