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

/81

0 solves (within 24h)

0 solves (after 24h)

No solved challenges yet.

Today's Challenge

Submissions (latest 3)

goroshirow

SOLVED!

Feb 18, 11:41 PM

ahnmo

SOLVED!

Feb 18, 11:37 PM

ksan

SOLVED!

Feb 18, 11:23 PM

Leaderboard

Period

Try the first challenge

Is this your first CTF? Let's begin by tackling the first challenge released on Daily AlpacaHack.

Topics and categories are revealed in advance for upcoming challenges.

Feb 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

keymoon

git gc

Misc

Medium

139 solves

chocorusk

ToyPQC

Crypto

Hard

100 solves

tchen

No JS

Web

Medium

119 solves

k0080

shellcode-101

Pwn

Medium

117 solves

yu212

Linear Coffee Generator

Crypto

Hard

105 solves

ark

optimal-sort

Misc

Hard

95 solves

admin

Camelidae

Misc

Welcome

279 solves

minaminao

Substance

Crypto

Easy

189 solves

tan90909090

read-a-binary

Rev

Easy

173 solves

tchen

Magic Engine

Web

Easy

197 solves

kanon

RRe_Time_Limiter

Crypto

Medium

146 solves

minaminao

The World

Misc

Easy

149 solves

tan90909090

misdirection

Rev

Medium

123 solves

hiikunz

Compressor

Misc

Hard

93 solves

tchen

Plz Login

Web

Medium

167 solves

k0080

Alpaca-Llama Ranch

Pwn

Hard

104 solves

ark

destructuring

Misc

Easy

117 solves

hiikunz

AAAAAAAAEEEEEEEESSSSSSSS

Crypto

Medium

100 solves

minaminao

nc magic

Misc

Medium

110 solves

hiikunz

simple ROP

Pwn

Hard

89 solves

tchen

You are being redirected

Web

Medium

82 solves

kakur41

Alpaillier

Crypto

Medium

100 solves

rsk0315

wages of sin()

Rev

Misc

Hard

83 solves

k0080

Disappeared

Pwn

Medium

83 solves

minaminao

Pickle Loader

Misc

Medium

49 solves

rsk0315

Planned topicControl Sequences

Misc

Rev

Medium

pppp4649

Planned topicRSA

Crypto

Hard

k0080

Planned topicUninitialized Memory

Pwn

Hard

Coming soon

Go to B-SIDE

Writeups

Writeup for Disappeared baumroll1234 ja Disappeared 2 hours ago
Writeup for You are being redirected 39sho ja You are being redirected 8 hours ago
Writeup for wages of sin() rsk0315 author ja wages of sin() yesterday
Writeup for Daily AlpacaHack 1/26-2/1 labpump ja ToyPQC +5 yesterday
Writeup for Alpaillier baumroll1234 ja Alpaillier 2 days ago
Writeup for Alpaillier goroshirow ja Alpaillier 2 days ago
Writeup for simple ROP goroshirow ja simple ROP 3 days ago
Writeup for simple ROP rsk0315 ja simple ROP 4 days ago
Writeup for shellcode-101 rsk0315 ja shellcode-101 4 days ago
Writeup for Daily AlpacaHack 2/8-2/14 kakur41 ja AAAAAAAAEEEEEEEESSSSSSSS +6 4 days ago

Rows:

Five Alpacas

Topic: AES

166 solves

Crypto

Easy

Author:

hiikunz

Show Tags

🦙🦙🦙🦙🦙 < Basics of block cipher

server.py

description solves writeups