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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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Solve within 24 hours of release to appear on the leaderboard.

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Discussion with friends or AI is welcome (account sharing is prohibited).

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Sharing solutions is allowed only after 24 hours have passed since release.

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Today's Challenge

Submissions (latest 3)

SOLVED!

Jul 8, 5:05 PM

SOLVED!

Jul 8, 5:03 PM

goat-antony2008

SOLVED!

Jul 8, 5:02 PM

Leaderboard

Period

Try the first challenge

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

AlpacaHack 2100

Upcoming challenges reveal the , , and in advance.

Jul 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

29

tchen

Web

Medium

70 solves

30

minaminao

Super Short System Exit

Misc

Medium

78 solves

1

admin

Misc

Welcome🌱

167 solves

2

hiikunz

Crypto

Easy🌱

112 solves

3

tchen

Web

Easy🌱

105 solves

4

hiikunz

Rev

Medium

90 solves

5

tchen

IP Blocked Secret

Web

Hard

55 solves

6

minaminao

duplicate entry

Misc

Easy🌱

105 solves

7

hiikunz

Crypto

Medium

87 solves

8

minaminao

Let's Poly1305!

Crypto

Medium

64 solves

9

shiragi

Misc

Easy🌱

31 solves

10

Planned topicSQL

Web

Medium

11

Planned topicStack

Pwn

Hard

12

Planned topicC++

Rev

Hard

13

Planned topicHTTP

Web

Easy🌱

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

1

Planned topicWelcome

Misc

Welcome🌱

2

Coming soon

Want a harder challenge?

Writeups

Writeup for Let's Poly1305!

goroshirow

ja

Let's Poly1305!

20 minutes ago

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

tsukuyomi-chan

ja

Let's Poly1305!

1 hour ago

Daily AlpacaHackに挑戦するつくよみちゃん07/07/Lazy RSA/hiikunz

tsukuyomi-chan

ja

1 hour ago

Writeup for Lazy RSA

baumroll1234

ja

19 hours ago

Writeup for Lazy RSA

nirvana

ja

19 hours ago

Writeup for Lazy RSA

goroshirow

ja

2026/07/07 15:23

Writeup for Style Your Alpaca

00xcanelo

ar

Style Your Alpaca

2026/07/07 12:55

Writeup for duplicate entry (by bash)

nitcelcius

ja

duplicate entry

2026/07/07 00:01

Writeup for duplicate entry

nirvana

ja

duplicate entry

2026/07/06 21:39

Writeup for duplicate entry

baumroll1234

ja

duplicate entry

2026/07/06 15:43

Rows:

private method

Topic: PythonReleased: Jul 9, 2026

31 solves

Easy🌱2.0

by

shiragi

USER	SOLVED AT
embe221ed	21 minutes ago
despair09	23 minutes ago
goat-antony2008	24 minutes ago
panya	37 minutes ago
guren	41 minutes ago
koufu193	57 minutes ago
ntanaka	1 hour ago
mti	1 hour ago
manuo	1 hour ago
wanui	1 hour ago
naitem	1 hour ago
nanashiku	1 hour ago
mak0tan	1 hour ago
roaris	1 hour ago
kit0723	1 hour ago
mionorn124	2 hours ago
kurgm	2 hours ago
rsk0315	2 hours ago
bsvac	2 hours ago
umineko	2 hours ago
edwowmath	2 hours ago
kusunoki-san	2 hours ago
toomer	2 hours ago
cocoa	2 hours ago
triforce997	2 hours ago

Rows:

description solves