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)

tsukuyomi-chan

SOLVED!

May 15, 11:06 AM

trimscash

SOLVED!

May 15, 10:29 AM

nitcelcius

SOLVED!

May 15, 9:49 AM

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.

May 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

shiragi

Unrevealed TXT

Misc

Easy🌱

124 solves

serioton

unheard

Misc

Medium

75 solves

minaminao

permission denied

Misc

Hard

77 solves

minaminao

permission denied 2

Misc

Medium

77 solves

admin

Alpaca++

Misc

Welcome🌱

209 solves

tchen

Alpaca Rangers 2

Web

Easy🌱

184 solves

pppp4649

Small N

Crypto

Easy🌱

140 solves

hiikunz

secret-table-2

Web

Medium

138 solves

serioton

do the math

Misc

Medium

109 solves

trimscash

func-array

Pwn

Easy🌱

132 solves

minaminao

permission denied 3

Misc

Medium

107 solves

baumroll1234

Vending Machine

Misc

Easy🌱

161 solves

hiikunz

reused n

Crypto

Medium

111 solves

rsk0315

Bounds Checking

Pwn

Hard

83 solves

serioton

Mirage

Rev

Easy🌱

114 solves

minaminao

hidden service

Misc

Medium

96 solves

tchen

Super Short Python Golf

Misc

Medium

107 solves

minaminao

Equation Cipher

Crypto

Medium

94 solves

tan90909090

curl as a service

Web

Misc

Medium

76 solves

k0080

Planned topicProcedure Linkage Table

Pwn

Hard

tan90909090

Planned topiccurl

Web

Misc

Hard

shiragi

Planned topicUser Agent

Web

Easy🌱

Coming soon

tchen

Planned topicLFI

Web

Medium

Coming soon

k0080

Planned topicCUDA

Rev

Hard

Coming soon

ptr-yudai

Planned topicStack

Pwn

Hard

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for Equation Cipher

goroshirow

Equation Cipher

6 hours ago

Writeup for Equation Cipher

baumroll1234

Equation Cipher

13 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 05/14 crypto/Equation Cipher/minaminao

tsukuyomi-chan

Equation Cipher

16 hours ago

Writeup for Equation Cipher

nozokare

Equation Cipher

18 hours ago

Writeup for Equation Cipher

tadanobutubutu

Equation Cipher

20 hours ago

Writeup for Super Short Python Golf

nozokare

Super Short Python Golf

yesterday

Writeup for hidden service

nozokare

hidden service

yesterday

Writeup for Mirage

nozokare

Mirage

yesterday

Writeup for Super Short Python Golf

tadanobutubutu

Super Short Python Golf

yesterday

Daily AlpacaHackに挑戦するつくよみちゃん 05/13 misc/Super Short Python Golf/tchen

tsukuyomi-chan

Super Short Python Golf

yesterday

Rows:

curl as a service

Topic: curlReleased: May 15, 2026

76 solves

Web Misc

Medium

tan90909090

This is a service that executes curl command!

Beginner Hint

curl command is often used for HTTP protocol communication. However, it actually supports a variety of protocols.
In this challenge, there is a flag in a container that serving an SSH service. Let's search how to use an SSH protocol from curl command.

curl-as-a-service.tar.gz

description solves