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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!

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Solve within 24 hours of release to appear on the leaderboard.

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

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Today's Challenge

Submissions (latest 3)

SOLVED!

Feb 16, 9:06 PM

SOLVED!

Feb 16, 8:33 PM

SOLVED!

Feb 16, 7:46 PM

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

Topics and categories are revealed in advance for upcoming challenges.

Mar 2026

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Writeups

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Writeup for destructuring itsuki-t ja destructuring 4 days ago

Rows:

RRe_Time_Limiter

Topic: Number Theory

144 solves

Crypto

Medium

Author:

kanon

Waiting for "love" amid these monotonous days, only to end up declaring, "Life's boring after all!" by ...

rre-time-limiter.tar.gz

description solves writeups