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

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No solved challenges yet.

Today's Challenge

Submissions (latest 3)

toomer

SOLVED!

Jul 18, 6:05 PM

54n43n32n21

SOLVED!

Jul 18, 5:49 PM

toto1010orange

SOLVED!

Jul 18, 5:06 PM

Leaderboard

Period

Try the first challenge

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

Upcoming challenges reveal the , , and in advance.

Jul 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

tchen

Nano Services

Web

Medium

87 solves

minaminao

Super Short System Exit

Misc

Medium

82 solves

admin

Alpaca Nation

Misc

Welcome🌱

216 solves

hiikunz

Flag is A+B

Crypto

Easy🌱

128 solves

tchen

Lucky Redirect

Web

Easy🌱

120 solves

hiikunz

Renda

Rev

Medium

103 solves

tchen

IP Blocked Secret

Web

Hard

63 solves

minaminao

duplicate entry

Misc

Easy🌱

128 solves

hiikunz

Lazy RSA

Crypto

Medium

100 solves

minaminao

Let's Poly1305!

Crypto

Medium

75 solves

shiragi

private method

Misc

Easy🌱

123 solves

hiikunz

secret-table-3

Web

Medium

82 solves

baumroll1234

A slight mistake

Pwn

Hard

69 solves

tan90909090

Compile time flag checker

Rev

Hard

56 solves

baumroll1234

Redirecting to Login Page

Web

Easy🌱

128 solves

tchen

You've Got Shlex

Misc

Medium

82 solves

minaminao

Let's Poly1305! 2

Crypto

Hard

63 solves

tchen

Beat the Alpaca Lord

Web

Medium

86 solves

pppp4649

biribiri

Crypto

Medium

81 solves

tchen

Greetings CGI

Web

Hard

56 solves

hiikunz

no win func

Pwn

Hard

13 solves

tchen

Planned topicGeneral

Web

Easy🌱

Coming soon

minaminao

Planned topicCache

Web

Hard

tchen

Planned topicPython

Web

Hard

Coming soon

admin

Planned topicWelcome

Misc

Welcome🌱

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for You've Got Shlex

nitcelcius

You've Got Shlex

5 hours ago

Writeup for Compile time flag checker

edwowmath

Compile time flag checker

16 hours ago

Writeup for biribiri

baumroll1234

biribiri

21 hours ago

Writeup for Beat the Alpaca Lord

baumroll1234

Beat the Alpaca Lord

2026/07/16 21:24

Writeup for You've Got Shlex

tchen

author

You've Got Shlex

2026/07/16 01:15

Writeup for IP Blocked Secret

tchen

author

IP Blocked Secret

2026/07/15 23:53

Writeup for Let's Poly1305! 2

baumroll1234

Let's Poly1305! 2

2026/07/15 16:06

Writeup for Redirecting to Login Page

hiro-1noue

Redirecting to Login Page

2026/07/15 07:24

Writeup for Xmas Login Indo

bennettzy

Xmas Login

2026/07/15 07:00

Writeup for Alert my Flag

bennettzy

Alert my Flag

2026/07/14 14:26

Rows:

Let's Poly1305!

Topic: MACReleased: Jul 8, 2026

75 solves

Crypto

Medium5.0

minaminao

USER	SOLVED AT
gin	2026/07/16 12:20
yaguchi30113	2026/07/13 14:56
unity	2026/07/13 11:43
serioton	2026/07/10 21:56
kurimochi	2026/07/09 14:50
tmatsuura	2026/07/09 13:25
embe221ed	2026/07/09 10:23
lluuiiggee	2026/07/09 10:02
reid	2026/07/09 07:06
nakamulab	2026/07/09 05:48
sasa-bamboo	2026/07/09 05:33
kit0723	2026/07/08 15:51
tsukuyomi-chan	2026/07/08 14:44
nomeaning	2026/07/08 14:38
kitatai	2026/07/08 14:37
jjj-miso	2026/07/08 14:20
ratom	2026/07/08 14:01
stp	2026/07/08 13:24
labpump	2026/07/08 13:18
cfba82eb	2026/07/08 13:04
tyage	2026/07/08 12:34
forj	2026/07/08 12:31
kurokane-isumi	2026/07/08 12:26
n0name	2026/07/08 12:22
ss8888888	2026/07/08 12:05