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Daily AlpacaHack

A daily CTF challenge with a fun new puzzle every day

What is Daily AlpacaHack?

We publish one simple, beginner-friendly or educational CTF challenge every day!

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Today's Challenge
minaminaominaminao
duplicate entry
Misc
Easy🌱
28 solves
Submissions (latest 3)
kurgm
kurgm

SOLVED!

Jul 5, 5:38 PM

Leaderboard

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admin
AlpacaHack 2100
Misc
Welcome🌱
1,945 solves
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Jul 2026

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Writeups

Writeup for IP Blocked Secret

baumroll1234

ja
IP Blocked Secret

2 hours ago

nirvana

Writeup for Renda

ja

13 hours ago

nitcelcius

Writeup for Renda (by reading some code)

ja

2026/07/04 16:38

nitcelcius

Writeup for Flag is A+B

ja

2026/07/04 15:38

Daily AlpacaHackに挑戦するつくよみちゃん07/03/Lucky Redirect/tchen

tadanobutubutu

Writeup for Alpaca Quest

ja

2026/07/03 20:03

Rows:

duplicate entry

Topic: ZIPReleased: Jul 6, 2026

28 solves
Misc
Easy🌱2.0

by

minaminao

minaminao

You won't get the real flag.txt even after extraction! Probably.

Beginner Hint
  • If you read make_zip.py, you can see that many flag.txt entries are created.
  • When you extract flag.zip, depending on the tool, you may get two files, such as README.md and flag.txt.
  • Even if you look at this flag.txt, it only says No flag here. Try harder.
  • This is because the flag.txt containing the flag can be overwritten or ignored due to duplicate entries.
duplicate-entry.tar.gz

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descriptionsolves