๐ฆ๐ฆ๐ฆ๐ฆ๐ฆ < Basics of block cipher
Five Alpacas
Topic: AESReleased: Jan 15, 2026
A CTF challenge series with fun puzzles to enjoy every day
We regularly publish simple, beginner-friendly or educational CTF challenges!
Solve each challenge within its time window to appear on the leaderboard.
Discussion with friends or AI is welcome (account sharing is prohibited).
Sharing solutions is allowed only after the challenge period has ended.
Try the first challenge
Is this your first CTF? Let's begin by tackling the first challenge released on Daily AlpacaHack.
k0080Want a harder challenge?
Go to B-SIDE