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)

htbru

SOLVED!

Jul 21, 9:24 AM

stackotter

SOLVED!

Jul 21, 9:01 AM

apender

SOLVED!

Jul 21, 9:00 AM

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🌱

228 solves

hiikunz

Flag is A+B

Crypto

Easy🌱

138 solves

tchen

Lucky Redirect

Web

Easy🌱

130 solves

hiikunz

Renda

Rev

Medium

107 solves

tchen

IP Blocked Secret

Web

Hard

64 solves

minaminao

duplicate entry

Misc

Easy🌱

133 solves

hiikunz

Lazy RSA

Crypto

Medium

101 solves

minaminao

Let's Poly1305!

Crypto

Medium

76 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🌱

136 solves

tchen

You've Got Shlex

Misc

Medium

85 solves

minaminao

Let's Poly1305! 2

Crypto

Hard

63 solves

tchen

Beat the Alpaca Lord

Web

Medium

88 solves

pppp4649

biribiri

Crypto

Medium

85 solves

tchen

Greetings CGI

Web

Hard

68 solves

hiikunz

no win func

Pwn

Hard

68 solves

tchen

Alpaca Blog

Web

Easy🌱

90 solves

tan90909090

NOP Variant

Rev

Misc

Medium

48 solves

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 Alpaca Blog

baumroll1234

Alpaca Blog

11 hours ago

Writeup for no win func

ojun

no win func

2026/07/19 15:04

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

Rows:

Unrevealed TXT

Topic: DNSReleased: Apr 27, 2026

142 solves

Misc

Easy🌱3.0

shiragi

USER	SOLVED AT
aarabdh	2026/07/15 18:03
manuo	2026/07/08 16:36
paper	2026/07/07 02:26
shibe-hasu	2026/07/01 14:15
y1k	2026/06/30 10:05
bill1000001	2026/06/17 02:11
hiro-1noue	2026/06/11 06:58
zszushi	2026/06/11 06:52
rito	2026/06/09 08:19
azbnzn	2026/06/04 11:33
toto1010orange	2026/06/02 11:41
flaggarddenlab	2026/05/30 15:30
oyk	2026/05/30 01:15
nakamulab	2026/05/25 13:02
saranrappu0831	2026/05/22 14:16
hori	2026/05/21 04:18
chara0x	2026/05/21 02:31
will	2026/05/18 05:27
bubu	2026/05/15 07:09
apender	2026/05/07 11:11
stepbystepbymyself	2026/05/06 10:34
hageoyaji	2026/05/06 01:17
cqbtq	2026/05/05 06:54
toshiconner	2026/05/05 00:28
now4est	2026/05/04 20:09