AlpacaHack Logo
Sign InSign Up
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!

Join Anytime

Solve within 24 hours of release 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 24 hours have passed since release.

Solve stats

0

/21

No solved challenges yet.

Sign In to view your player stats

Today's Challenge
tan90909090tan90909090
NOP Variant
Rev
Misc
Medium
28 solves
Submissions (latest 3)
baumroll1234

SOLVED!

Jul 20, 11:10 PM

xnmhuveb

SOLVED!

Jul 20, 11:07 PM

serioton
serioton

SOLVED!

Jul 20, 10:59 PM

Leaderboard

Try the first challenge

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

View challenge
admin
AlpacaHack 2100
Misc
Welcome🌱
1,995 solves
Upcoming challenges reveal the , , and in advance.
Prev

Jul 2026

Next
Solved
Unsolved
Upcoming
Mon
Tue
Wed
Thu
Fri
Sat
Sun
29
tchentchen
Nano Services
Web
Medium
87 solves
30
minaminaominaminao
Super Short System Exit
Misc
Medium
82 solves
1
admin
Alpaca Nation
Misc
Welcome🌱
227 solves
2
hiikunzhiikunz
Flag is A+B
Crypto
Easy🌱
137 solves
3
tchentchen
Lucky Redirect
Web
Easy🌱
129 solves
4
hiikunzhiikunz
Renda
Rev
Medium
107 solves
5
tchentchen
IP Blocked Secret
Web
Hard
64 solves
6
minaminaominaminao
duplicate entry
Misc
Easy🌱
132 solves
7
hiikunzhiikunz
Lazy RSA
Crypto
Medium
101 solves
8
minaminaominaminao
Let's Poly1305!
Crypto
Medium
75 solves
9
shiragishiragi
private method
Misc
Easy🌱
127 solves
10
hiikunzhiikunz
secret-table-3
Web
Medium
82 solves
11
baumroll1234
A slight mistake
Pwn
Hard
69 solves
12
tan90909090tan90909090
Compile time flag checker
Rev
Hard
56 solves
13
baumroll1234
Redirecting to Login Page
Web
Easy🌱
136 solves
14
tchentchen
You've Got Shlex
Misc
Medium
85 solves
15
minaminaominaminao
Let's Poly1305! 2
Crypto
Hard
63 solves
16
tchentchen
Beat the Alpaca Lord
Web
Medium
88 solves
17
pppp4649pppp4649
biribiri
Crypto
Medium
83 solves
18
tchentchen
Greetings CGI
Web
Hard
67 solves
19
hiikunzhiikunz
no win func
Pwn
Hard
67 solves
20
tchentchen
Alpaca Blog
Web
Easy🌱
86 solves
21
tan90909090tan90909090
NOP Variant
Rev
Misc
Medium
28 solves
22
Coming soon
23
Coming soon
24
Coming soon
25
minaminaominaminao
Planned topicCache
Web
Hard
26
tchentchen
Planned topicPython
Web
Hard
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
31
Coming soon
1
admin
Planned topicWelcome
Misc
Welcome🌱
2
Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for Alpaca Blog

baumroll1234

ja
Alpaca Blog

1 hour ago

ojun

Writeup for no win func

ojun

ja
no win func

2026/07/19 15:04

kurimochi

Writeup for You've Got Shlex (shlex only)

kurimochi

ja
You've Got Shlex

2026/07/19 05:58

Writeup for Greetings CGI

baumroll1234

ja
Greetings CGI

2026/07/18 23:23

nitcelcius

Writeup for You've Got Shlex

nitcelcius

ja
You've Got Shlex

2026/07/18 12:59

edwowmath

Writeup for Compile time flag checker

edwowmath

ja
Compile time flag checker

2026/07/18 02:07

Writeup for biribiri

baumroll1234

ja
biribiri

2026/07/17 21:38

Writeup for Beat the Alpaca Lord

baumroll1234

ja
Beat the Alpaca Lord

2026/07/16 21:24

tchen

Writeup for You've Got Shlex

tchen

author
en
You've Got Shlex

2026/07/16 01:15

tchen

Writeup for IP Blocked Secret

tchen

author
en
IP Blocked Secret

2026/07/15 23:53

Rows:

do the math

Topic: JailReleased: May 5, 2026

119 solves
Misc
Medium5.5

by

serioton

serioton

Writeups

kakur41

Writeup for Daily AlpacaHack 5/3-5/9

kakur41

ja

2026/05/09 15:23

tadanobutubutu

Writeup for do the math

tadanobutubutu

ja

2026/05/05 15:28

Daily AlpacaHackに挑戦するつくよみちゃん 05/05 misc/do the math/serioton

tsukuyomi-chan

ja

2026/05/05 18:30

descriptionsolveswriteups