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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.

Not a Competition

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

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

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Today's Challenge
pppp4649pppp4649
Happy Birthday
Crypto
Easy🌱
18 solves
Submissions (latest 3)
baumroll1234

SOLVED!

Aug 4, 9:34 PM

guren

SOLVED!

Aug 4, 8:41 PM

Leaderboard

Try the first challenge

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

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admin
AlpacaHack 2100
Misc
Welcome🌱
2,065 solves
Upcoming challenges reveal the , , and in advance.
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Dec 2066

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Writeups

Writeup for Long Long Flag Printer 2026

baumroll1234

ja
Long Long Flag Printer 2026

3 hours ago

michikusamichiya

Writeup for Leaked Flag Checker (XORing the Entire Binary!?)

michikusamichiya

Writeup for size limit

alpha0314sub

Writeup for Password, Please

nirvana

Writeup for Password, Please

ja

2026/08/02 16:28

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