Sign In Sign 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

Submissions (latest 3)

SOLVED!

Jul 9, 12:40 PM

SOLVED!

Jul 9, 12:39 PM

SOLVED!

Jul 9, 12:36 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

75 solves

30

minaminao

Super Short System Exit

Misc

Medium

78 solves

1

admin

Misc

Welcome🌱

170 solves

2

hiikunz

Crypto

Easy🌱

113 solves

3

tchen

Web

Easy🌱

107 solves

4

hiikunz

Rev

Medium

93 solves

5

tchen

IP Blocked Secret

Web

Hard

57 solves

6

minaminao

duplicate entry

Misc

Easy🌱

109 solves

7

hiikunz

Crypto

Medium

89 solves

8

minaminao

Let's Poly1305!

Crypto

Medium

69 solves

9

shiragi

Misc

Easy🌱

85 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!

baumroll1234

ja

Let's Poly1305!

16 hours ago

Writeup for Let's Poly1305!

goroshirow

ja

Let's Poly1305!

19 hours 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!

20 hours ago

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

tsukuyomi-chan

ja

20 hours ago

Writeup for Lazy RSA

baumroll1234

ja

2026/07/07 21:50

Writeup for Lazy RSA

nirvana

ja

2026/07/07 21:37

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

Rows:

Another Login Challenge

Topic: LoginReleased: Mar 13, 2026

159 solves

Medium4.0

by

tchen

Tags

USER	SOLVED AT
tadanobutubutu	13 hours ago
toto1010orange	2026/07/03 08:15
s1340175	2026/07/02 11:00
tozawa	2026/07/01 13:41
mio	2026/07/01 10:41
ayane511	2026/07/01 06:17
keita	2026/06/30 10:32
kobayashi	2026/06/27 03:29
tai	2026/06/25 10:40
s1340025	2026/06/25 09:44
s1340229	2026/06/25 09:34
s1340207	2026/06/25 09:34
ka-te	2026/06/25 09:30
s1340003	2026/06/25 08:45
nagiaaa	2026/06/25 08:24
umachaba	2026/06/20 12:59
hori	2026/06/14 12:48
rito	2026/06/08 08:22
nakamulab	2026/06/01 06:45
tat	2026/05/27 11:29
apender	2026/05/18 02:49
stone	2026/05/13 13:59
logdav	2026/05/12 03:16
yukino	2026/05/11 07:22
sota70	2026/05/08 15:28

Rows:

description solves writeups