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Daily AlpacaHack

A CTF challenge series with fun puzzles to enjoy every day

What is Daily AlpacaHack?

We regularly publish simple, beginner-friendly or educational CTF challenges!

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

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Today's Challenge
hiikunzhiikunz
AESAESAESAESAESAES
Crypto
Hard
17 solves
Submissions (latest 3)
haihuiliyuyuan

SOLVED!

Aug 6, 1:02 AM

tet3

SOLVED!

Aug 6, 12:42 AM

xnmhuveb

SOLVED!

Aug 5, 11:52 PM

Leaderboard

Try the first challenge

Is this your first CTF? Let's begin by tackling the first challenge released on Daily AlpacaHack.

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admin
AlpacaHack 2100
Misc
Welcome🌱
2,067 solves
Upcoming challenges reveal the , , and in advance.
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Aug 2026

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27
tchentchen
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hiikunzhiikunz
AESAESAESAESAESAES
Crypto
Hard
17 solves
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Writeups

Writeup for Happy Birthday

baumroll1234

ja
Happy Birthday

4 hours ago

Writeup for strange filename

haruhana

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strange filename

21 hours ago

Writeup for Long Long Flag Printer 2026

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Long Long Flag Printer 2026

2026/08/04 18:46

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ja
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2026/08/04 11:10

michikusamichiya

Writeup for Leaked Flag Checker (XORing the Entire Binary!?)

michikusamichiya

ja
Leaked Flag Checker

2026/08/04 03:40

michikusamichiya

Writeup for size limit

michikusamichiya

ja
size limit

2026/08/04 03:11

Writeup for SwapSwap

haruhana

ja
SwapSwap

2026/08/04 02:47

alpha0314sub

Writeup for Password, Please

alpha0314sub

ja
Password, Please

2026/08/02 23:25

Writeup for Password, Please

baumroll1234

ja
Password, Please

2026/08/02 17:36

nirvana

Writeup for Password, Please

nirvana

ja
Password, Please

2026/08/02 16:28

Rows:

Alpaca Bank

Topic: GeneralReleased: Dec 11, 2025

400 solves
Web
Medium2.0

by

hiikunz

hiikunz

🦙 < A simple bank service

  • NOTE1: You don't have to register many accounts to get the flag. Please DO NOT make excessive requests.
  • NOTE2: This problem is inspired by trillion bank - SECCON CTF 13 Quals, but no knowledge of it is required.
alpaca-bank.tar.gz

Please sign in to submit the flag.

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