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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
tchen
Resume Maker
Web
Very Hard
31 solves
Submissions (latest 3)
nuigurumi

SOLVED!

Mar 6, 10:21 AM

Leaderboard
Upcoming challenges reveal the , , and in advance.
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Mar 2026

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chocorusk
Stealerusk
Rev
Very Hard
40 solves
25-28
k0080
useful-gadget
Pwn
Very Hard
42 solves
1-4
9️⃣
Misc
Very Hard
39 solves
 
9️⃣
Misc
Very Hard
39 solves
5-8
tchen
Resume Maker
Web
Very Hard
31 solves
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Writeups

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blackade

ja
9️⃣

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last week

Daily AlpacaHack B-SIDE "ECRSA" writeup

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Writeup for ECRSA

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last week

Writeup for ECRSA

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last week

Rows:

invisible-grep

Topic: GeneralReleased: Feb 9, 2026

37 solves
Misc
Very Hard

Author:

minaminao

made a grep that eat flags!

flag format: Alpaca{[a-z_]+}

invisible-grep.tar.gz
descriptionsolveswriteups