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

/9

No solved challenges yet.

Sign In to view your player stats

Today's Challenge
shiragishiragi
private method
Misc
Easy🌱
36 solves
Submissions (latest 3)
ta-tomousimasu

SOLVED!

Jul 8, 7:26 PM

trimscash

SOLVED!

Jul 8, 6:13 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🌱
1,955 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
70 solves
30
minaminaominaminao
Super Short System Exit
Misc
Medium
78 solves
1
admin
Alpaca Nation
Misc
Welcome🌱
167 solves
2
hiikunzhiikunz
Flag is A+B
Crypto
Easy🌱
112 solves
3
tchentchen
Lucky Redirect
Web
Easy🌱
105 solves
4
hiikunzhiikunz
Renda
Rev
Medium
91 solves
5
tchentchen
IP Blocked Secret
Web
Hard
56 solves
6
minaminaominaminao
duplicate entry
Misc
Easy🌱
105 solves
7
hiikunzhiikunz
Lazy RSA
Crypto
Medium
87 solves
8
minaminaominaminao
Let's Poly1305!
Crypto
Medium
64 solves
9
shiragishiragi
private method
Misc
Easy🌱
36 solves
10
hiikunzhiikunz
Planned topicSQL
Web
Medium
12
Planned topicC++
Rev
Hard
14
Planned topicJail
Misc
Medium
15
Coming soon
16
Coming soon
17
Planned topicMAC
Crypto
Medium
18
Planned topicCGI
Web
Hard
19
Planned topicStack
Pwn
Hard
20
Coming soon
21
Coming soon
22
Planned topicCache
Web
Medium
23
Coming soon
24
Coming soon
25
Planned topicMAC
Crypto
Hard
26
Planned topicPython
Web
Hard
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
31
Coming soon
2
Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for Let's Poly1305!

goroshirow

ja
Let's Poly1305!

2 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん07/08/Let's Poly1305!/minaminao

nirvana

Writeup for Lazy RSA

ja

21 hours ago

nitcelcius

Writeup for duplicate entry (by bash)

ja

2026/07/07 00:01

nirvana

Writeup for duplicate entry

ja

2026/07/06 21:39

Rows:

func-array

Topic: Function PointerReleased: May 6, 2026

166 solves
Pwn
Easy🌱2.5

by

trimscash

trimscash

USER

SOLVED AT

404gh0st

404gh0st

8 hours ago

2026/06/10 05:54

2026/06/10 03:20

2026/06/09 07:25

2026/06/05 05:17

2026/06/04 21:43

2026/06/03 14:42

2026/06/02 13:52

2026/05/31 17:02

2026/05/31 13:31

2026/05/31 08:35

2026/05/29 14:13

2026/05/29 13:20

2026/05/27 14:48

2026/05/26 14:27

2026/05/26 08:39

2026/05/26 02:09

2026/05/25 13:00

2026/05/25 12:04

2026/05/24 13:38

2026/05/24 06:26

2026/05/23 10:43

2026/05/22 21:09

2026/05/22 15:21

2026/05/22 14:39

Rows:

descriptionsolveswriteups