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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Today's Challenge

Submissions (latest 3)

itsuki-t

SOLVED!

Jul 28, 6:31 PM

mti

SOLVED!

Jul 28, 6:27 PM

embe221ed

SOLVED!

Jul 28, 4:54 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

88 solves

minaminao

Super Short System Exit

Misc

Medium

84 solves

admin

Alpaca Nation

Misc

Welcome🌱

258 solves

hiikunz

Flag is A+B

Crypto

Easy🌱

155 solves

tchen

Lucky Redirect

Web

Easy🌱

149 solves

hiikunz

Renda

Rev

Medium

115 solves

tchen

IP Blocked Secret

Web

Hard

68 solves

minaminao

duplicate entry

Misc

Easy🌱

147 solves

hiikunz

Lazy RSA

Crypto

Medium

105 solves

minaminao

Let's Poly1305!

Crypto

Medium

76 solves

shiragi

private method

Misc

Easy🌱

142 solves

hiikunz

secret-table-3

Web

Medium

86 solves

baumroll1234

A slight mistake

Pwn

Hard

71 solves

tan90909090

Compile time flag checker

Rev

Hard

56 solves

baumroll1234

Redirecting to Login Page

Web

Easy🌱

161 solves

tchen

You've Got Shlex

Misc

Medium

89 solves

minaminao

Let's Poly1305! 2

Crypto

Hard

64 solves

tchen

Beat the Alpaca Lord

Web

Medium

91 solves

pppp4649

biribiri

Crypto

Medium

86 solves

tchen

Greetings CGI

Web

Hard

71 solves

hiikunz

no win func

Pwn

Hard

75 solves

tchen

Alpaca Blog

Web

Easy🌱

118 solves

tan90909090

NOP Variant

Rev

Misc

Medium

65 solves

ark

jinjail

Misc

Hard

44 solves

tchen

True or False

Misc

Medium

74 solves

minaminao

Cache Me If You Can 2

Web

Hard

54 solves

k0080

what-is-my-pointer

Pwn

Hard

51 solves

tchen

Greetings i18n

Web

Hard

53 solves

tchen

RFC100008

Web

Easy🌱

95 solves

2501

One More Approval

Crypto

Medium

48 solves

2501

zen.zip

Misc

Medium

20 solves

Coming soon

admin

Planned topicWelcome

Misc

Welcome🌱

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for RFC100008

nirvana

RFC100008

22 hours ago

Writeup for Leaked Flag Checker

haruhana

Leaked Flag Checker

2026/07/27 02:37

Writeup for no win func

nirvana

no win func

2026/07/26 12:18

Writeup for what-is-my-pointer

nirvana

what-is-my-pointer

2026/07/26 00:24

Writeup for Cache Me If You Can 2 (with PowerShell)

nitcelcius

Cache Me If You Can 2

2026/07/25 14:14

Writeup for True or False

baumroll1234

True or False

2026/07/23 20:57

Writeup for True or False

nirvana

True or False

2026/07/23 15:05

Writeup for jinjail

goroshirow

jinjail

2026/07/23 07:16

Writeup for NOP Variant

umineko

NOP Variant

2026/07/22 04:11

Daily AlpacaHackに挑戦するつくよみちゃん07/21/NOP Variant/tan90909090

tsukuyomi-chan

NOP Variant

2026/07/21 16:33

Rows:

private method

Topic: PythonReleased: Jul 9, 2026

142 solves

Misc

Easy🌱2.5

shiragi

USER	SOLVED AT
udonrillakuma	2026/07/27 13:45
e6nlaq	2026/07/27 09:04
midomato	2026/07/27 06:55
y482	2026/07/26 13:41
suruga	2026/07/26 13:02
ynatwest	2026/07/26 04:15
jiku	2026/07/23 17:40
syougotea	2026/07/23 15:21
pickles	2026/07/23 12:32
ma-to5298	2026/07/22 14:27
toshiconner	2026/07/22 13:35
adenosine	2026/07/22 12:14
kame	2026/07/22 07:52
sora-ko	2026/07/22 07:36
macarthur	2026/07/21 12:05
54n43n32n21	2026/07/20 13:53
koka	2026/07/20 08:19
garangara	2026/07/19 11:47
aquo	2026/07/19 00:30
kooooochi	2026/07/18 16:40
naaa	2026/07/18 13:42
awazustamin	2026/07/18 13:25
zenith	2026/07/18 03:21
itamepurin	2026/07/17 04:03
nashu	2026/07/17 01:16