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)

itsuki-t

SOLVED!

Jul 13, 8:37 PM

yoppy-h

SOLVED!

Jul 13, 8:35 PM

embe221ed

SOLVED!

Jul 13, 8:22 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

81 solves

minaminao

Super Short System Exit

Misc

Medium

79 solves

admin

Alpaca Nation

Misc

Welcome🌱

190 solves

hiikunz

Flag is A+B

Crypto

Easy🌱

118 solves

tchen

Lucky Redirect

Web

Easy🌱

111 solves

hiikunz

Renda

Rev

Medium

98 solves

tchen

IP Blocked Secret

Web

Hard

61 solves

minaminao

duplicate entry

Misc

Easy🌱

117 solves

hiikunz

Lazy RSA

Crypto

Medium

96 solves

minaminao

Let's Poly1305!

Crypto

Medium

74 solves

shiragi

private method

Misc

Easy🌱

106 solves

hiikunz

secret-table-3

Web

Medium

76 solves

baumroll1234

A slight mistake

Pwn

Hard

62 solves

tan90909090

Compile time flag checker

Rev

Hard

49 solves

baumroll1234

Redirecting to Login Page

Web

Easy🌱

97 solves

tchen

You've Got Shlex

Misc

Medium

26 solves

Coming soon

minaminao

Planned topicMAC

Crypto

Medium

tchen

Planned topicCGI

Web

Hard

hiikunz

Planned topicStack

Pwn

Hard

Coming soon

minaminao

Planned topicCache

Web

Medium

Coming soon

minaminao

Planned topicMAC

Crypto

Hard

tchen

Planned topicPython

Web

Hard

Coming soon

admin

Planned topicWelcome

Misc

Welcome🌱

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

secret-table-3 Writeup

nomeaning

secret-table-3

20 hours ago

Writeup for A slight mistake

baumroll1234

author

A slight mistake

2026/07/12 11:31

Writeup for A slight mistake

goroshirow

A slight mistake

2026/07/11 15:09

Writeup for secret-table-3

baumroll1234

secret-table-3

2026/07/11 01:09

Writeup for Let's Poly1305!

kurimochi

Let's Poly1305!

2026/07/10 13:13

Writeup for private method

nitcelcius

private method

2026/07/10 09:37

Writeup for Find XOR key

haruhana

Find XOR key

2026/07/10 02:48

Writeup for private method

nirvana

private method

2026/07/09 22:52

Writeup for private method

baumroll1234

private method

2026/07/09 16:53

Writeup for Let's Poly1305!

baumroll1234

Let's Poly1305!

2026/07/08 20:20

Rows:

You've Got Shlex

Topic: JailReleased: Jul 14, 2026

26 solves

Misc

Medium

tchen

USER	SOLVED AT
itsuki-t	13 minutes ago
yoppy-h	15 minutes ago
embe221ed	29 minutes ago
nomeaning	51 minutes ago
kurgm	2 hours ago
bhcnumas	2 hours ago
hiziki	2 hours ago
mti	3 hours ago
nakamulab	4 hours ago
kinner	4 hours ago
roaris	4 hours ago
toto1010orange	4 hours ago
kakur41	4 hours ago
a01sa01to	5 hours ago
rsk0315	5 hours ago
cat22222	5 hours ago
mak0tan	5 hours ago
nuhe	5 hours ago
toomer	5 hours ago
hiikunz	5 hours ago
panya	5 hours ago
tadanobutubutu	5 hours ago
bsvac	5 hours ago
cocoa	5 hours ago
umineko	5 hours ago

Rows:

description solves