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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
2501
The 3rd
Crypto
Hard
6 solves
Submissions (latest 3)
kurgm
kurgm

SOLVED!

Sep 21, 3:52 PM

serioton

SOLVED!

Sep 21, 3:19 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🌱
2,211 solves
Upcoming challenges reveal the , , and in advance.
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Sep 2026

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tchentchen
Springing
Web
Medium
74 solves
1
admin
QUIZ ALPACASHOCK
Misc
Welcome🌱
124 solves
2
hiikunzhiikunz
base 16-32-64
Misc
Easy🌱
101 solves
3-4
tan90909090tan90909090
Let's Shut Down Linux
Misc
Medium
63 solves
5
baumroll1234
6-8
minaminaominaminao
Bitflip RSA
Crypto
Hard
56 solves
 
minaminaominaminao
Bitflip RSA
Crypto
Hard
56 solves
9-11
minaminaominaminao
\^o^/
Misc
Hard
43 solves
12-13
tan90909090tan90909090
sin function vs. fsin instruction
Rev
Misc
Medium
55 solves
14-15
tan90909090tan90909090
integer division
Misc
Medium
69 solves
16-18
edwowmathedwowmath
neighboRhood_diStAnce
Crypto
Hard
40 solves
19-21
hiikunzhiikunz
nested eval
Misc
Hard
39 solves
 
hiikunzhiikunz
nested eval
Misc
Hard
39 solves
22-24
2501
The 3rd
Crypto
Hard
6 solves
25
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26
Coming soon
27
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28
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29
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30
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1
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Writeups

shiragi

Writeup for nested eval

shiragi

ja
nested eval

1 hour ago

gattoartz

Writeup for Alpaca Bank

gattoartz

Writeup for Read Assembly

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Writeup for hit-and-miss

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Writeup for simpleoverflow

curetwinkle

Writeup for simple ROP(アセンブリ解説多め)

ja

2026/09/15 03:55

Rows:

AESAESAESAESAESAES

Topic: AESReleased: Aug 6, 2026

61 solves
Crypto
Hard6.0

by

hiikunz

hiikunz

I said it many times because it's important!

server.py

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