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B-SIDE

A daily CTF challenge with a fun new puzzle every day

What is B-SIDE?

This side program features challenges with a different flavor from Daily AlpacaHack. We publish one harder or more unconventional challenge every few days.

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.

New to CTFs?

This program features higher difficulty and unconventional challenges. Try the beginner-friendly Daily AlpacaHack first to warm up.

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Today's Challenge
pppp4649pppp4649
Re:Small d
Crypto
Hard
12 solves
Submissions (latest 3)
tyage
tyage

SOLVED!

May 30, 3:30 PM

kurgm

SOLVED!

May 30, 7:59 AM

Leaderboard
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Writeups

kurgm

Writeup for Secret Fail

kurgm

ja
Secret Fail

5 hours ago

hxuu

Writeup for Resume Maker

en

2026/05/23 15:58

hxuu

Writeup for Bulk Note

en

2026/05/22 23:25

hxuu

Writeup for Iframe Sandbox

en

2026/05/21 20:28

kurgm

Writeup for The Sandbox

ja

2026/05/17 06:30

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