Sign In Sign Up

Daily AlpacaHack

A daily CTF challenge with a fun new puzzle every day

What is Daily AlpacaHack?

We publish one simple, beginner-friendly or educational CTF challenge every day!

Join Anytime

Solve within 24 hours of release 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 24 hours have passed since release.

Solve stats

0

/96

No solved challenges yet.

Sign In to view your player stats

Today's Challenge

Submissions (latest 3)

SOLVED!

Mar 6, 12:05 PM

SOLVED!

Mar 6, 11:50 AM

SOLVED!

Mar 6, 11:39 AM

Leaderboard

Period

Try the first challenge

Is this your first CTF? Let's begin by tackling the first challenge released on Daily AlpacaHack.

AlpacaHack 2100

Upcoming challenges reveal the , , and in advance.

Apr 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

30

Coming soon

31

Coming soon

1

Coming soon

2

Coming soon

3

Coming soon

4

Coming soon

5

Coming soon

6

Coming soon

7

Coming soon

8

Coming soon

9

Coming soon

10

Coming soon

11

Coming soon

12

Coming soon

13

Coming soon

14

Coming soon

15

Coming soon

16

Coming soon

17

Coming soon

18

Coming soon

19

Coming soon

20

Coming soon

21

Coming soon

22

Coming soon

23

Coming soon

24

Coming soon

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

Want a harder challenge?

Writeups

Author's Writeup for Flag Printer 2026 minaminao author ja Flag Printer 2026 23 hours ago
Writeup for Bars baumroll1234 ja Bars 2 days ago
Writeup for pyjs rqda en pyjs 4 days ago
Writeup for pyjs tchen en pyjs 4 days ago
Writeup for pyjs hiikunz ja pyjs 4 days ago
Writeup for pyjs rsk0315 ja pyjs 5 days ago
Writeup for Daily AlpacaHack 2/22-2/28 kakur41 author ja Noob programmer +6 5 days ago
Writeup for pyjs toomer en pyjs 5 days ago
Writeup for One Byte Padding Oracle Attack baumroll1234 ja One Byte Padding Oracle Attack 5 days ago
Writeup for pyjs baumroll1234 ja pyjs 5 days ago

Rows:

Flag Printer 2026

Topic: NetworkReleased: Mar 4, 2026

128 solves

Misc

Easy

Author:

minaminao

f ~~~~~~~~~~~~~~~~~~~~ l ~~~~~~~~~~~~~~~~~~~~ a ~~~~~~~~~~~~~~~~~~~~ g ~~~~~~~~~~~~~~~~~~~~

Beginner Hint

When you connect using nc, you can see that the part of the flag after Alpaca{ is not printed.
If you read the Dockerfile, you may understand why this happens.

flag-printer-2026.tar.gz

description solves writeups