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.

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No solved challenges yet.

Today's Challenge

Submissions (latest 3)

hedgehogeyexd

SOLVED!

Jul 20, 2:15 PM

stp

SOLVED!

Jul 20, 2:04 PM

naitem

SOLVED!

Jul 20, 1:10 PM

Leaderboard

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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🌱

226 solves

hiikunz

Flag is A+B

Crypto

Easy🌱

135 solves

tchen

Lucky Redirect

Web

Easy🌱

127 solves

hiikunz

Renda

Rev

Medium

106 solves

tchen

IP Blocked Secret

Web

Hard

64 solves

minaminao

duplicate entry

Misc

Easy🌱

132 solves

hiikunz

Lazy RSA

Crypto

Medium

101 solves

minaminao

Let's Poly1305!

Crypto

Medium

75 solves

shiragi

private method

Misc

Easy🌱

127 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🌱

135 solves

tchen

You've Got Shlex

Misc

Medium

83 solves

minaminao

Let's Poly1305! 2

Crypto

Hard

63 solves

tchen

Beat the Alpaca Lord

Web

Medium

88 solves

pppp4649

biribiri

Crypto

Medium

83 solves

tchen

Greetings CGI

Web

Hard

66 solves

hiikunz

no win func

Pwn

Hard

65 solves

tchen

Alpaca Blog

Web

Easy🌱

80 solves

tan90909090

Planned topicx86

Rev

Misc

Medium

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 no win func

ojun

no win func

23 hours ago

Writeup for You've Got Shlex (shlex only)

kurimochi

You've Got Shlex

2026/07/19 05:58

Writeup for Greetings CGI

baumroll1234

Greetings CGI

2026/07/18 23:23

Writeup for You've Got Shlex

nitcelcius

You've Got Shlex

2026/07/18 12:59

Writeup for Compile time flag checker

edwowmath

Compile time flag checker

2026/07/18 02:07

Writeup for biribiri

baumroll1234

biribiri

2026/07/17 21:38

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

Rows:

Alpaca Blog

Topic: GeneralReleased: Jul 20, 2026

80 solves

Web

Easy🌱4.0

tchen

Writing a blog is easy when you have an LLM.

Beginner Hint

Carefully compare the behavior when the search string matches part of the flag with the behavior when it does not match.

alpaca-blog.tar.gz

description solves