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

/18

No solved challenges yet.

Today's Challenge

Submissions (latest 3)

bhcnumas

SOLVED!

Jul 17, 5:30 PM

kurgm

SOLVED!

Jul 17, 5:29 PM

rsk0315

SOLVED!

Jul 17, 4:46 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🌱

208 solves

hiikunz

Flag is A+B

Crypto

Easy🌱

124 solves

tchen

Lucky Redirect

Web

Easy🌱

119 solves

hiikunz

Renda

Rev

Medium

102 solves

tchen

IP Blocked Secret

Web

Hard

63 solves

minaminao

duplicate entry

Misc

Easy🌱

125 solves

hiikunz

Lazy RSA

Crypto

Medium

98 solves

minaminao

Let's Poly1305!

Crypto

Medium

75 solves

shiragi

private method

Misc

Easy🌱

119 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🌱

125 solves

tchen

You've Got Shlex

Misc

Medium

81 solves

minaminao

Let's Poly1305! 2

Crypto

Hard

61 solves

tchen

Beat the Alpaca Lord

Web

Medium

84 solves

pppp4649

biribiri

Crypto

Medium

78 solves

tchen

Greetings CGI

Web

Hard

12 solves

hiikunz

Planned topicStack

Pwn

Hard

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 Beat the Alpaca Lord

baumroll1234

Beat the Alpaca Lord

22 hours ago

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

Writeup for Redirecting to Login Page

baumroll1234

author

Redirecting to Login Page

2026/07/14 13:20

Writeup for Lucky Redirect

okzkey

Lucky Redirect

2026/07/14 01:15

Writeup for Redirecting to Login Page

okzkey

Redirecting to Login Page

2026/07/14 01:13

Rows:

curl as a service

Topic: curlReleased: May 15, 2026

144 solves

Web Misc

Medium5.0

tan90909090

USER	SOLVED AT
keita	2026/07/09 08:28
tozawa	2026/07/09 04:07
s1340229	2026/07/08 14:41
kobayashi	2026/07/08 09:03
s1340003	2026/07/08 06:43
s1340175	2026/07/08 04:16
ka-te	2026/07/08 04:08
nagiaaa	2026/07/07 17:13
mio	2026/07/05 06:09
s1340079	2026/07/03 01:12
s1340157	2026/07/02 15:06
ayane511	2026/07/02 09:40
s1340207	2026/07/02 09:40
tai	2026/07/02 09:32
s1340025	2026/07/02 09:25
htrssk	2026/07/02 09:10
39sho	2026/07/02 07:12
wow9	2026/06/28 12:30
misakazip	2026/06/23 06:29
toshiconner	2026/06/22 16:01
hori	2026/06/21 01:07
bl0rph	2026/06/18 20:11
madoka	2026/06/12 12:56
kusunoki-san	2026/06/11 16:53
n0ir	2026/06/05 11:02