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
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🌱
2,211 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🌱
124 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

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for flag obfuscation

enesbasmaci

en
flag obfuscation

1 hour ago

Rows:

Flag is A+B

Topic: MathematicsReleased: Jul 2, 2026

213 solves
Crypto
Easy🌱2.5

by

hiikunz

hiikunz

USER

SOLVED AT

hyouchun

2026/09/18 08:29

2026/09/11 01:50

2026/09/07 07:50

2026/09/04 11:55

2026/09/02 01:43

2026/09/01 13:12

2026/08/31 10:14

2026/08/30 09:33

2026/08/30 07:19

2026/08/29 12:29

2026/08/29 01:43

2026/08/28 14:11

2026/08/27 14:50

2026/08/27 01:04

2026/08/26 16:31

2026/08/25 15:59

2026/08/23 00:44

2026/08/22 13:09

2026/08/22 10:40

2026/08/22 09:25

2026/08/19 03:16

2026/08/18 08:12

2026/08/18 08:02

2026/08/17 15:14

2026/08/17 13:53

Rows:

descriptionsolveswriteups