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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.

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Solve each challenge within its time window to appear on the leaderboard.

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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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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
tchentchen
YAuth
Misc
Hard
14 solves
Submissions (latest 3)
umineko

SOLVED!

Jun 6, 5:11 PM

Leaderboard
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1-5
minaminaominaminao
vanished
Misc
Very Hard
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tchentchen
YAuth
Misc
Hard
14 solves
 
tchentchen
YAuth
Misc
Hard
14 solves
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Writeups

Writeup for vanished

fjkl1245p

ja
vanished

7 hours ago

yu212

Writeup for Re:Small d

ja

2026/06/02 08:53

kurgm

Writeup for Secret Fail

ja

2026/05/30 15:22

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

Rows:

Is this Twisted?

Topic: RNGReleased: Apr 19, 2026

29 solves
Crypto
Hard

by

yu212

yu212

Are all RNGs the same?

server.py

Please sign in to submit the flag.

descriptionsolveswriteups