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)

shinyaaaaa

SOLVED!

Apr 12, 1:12 PM

muhammed

SOLVED!

Apr 12, 12:58 PM

lluuiiggee

SOLVED!

Apr 12, 12:56 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.

Apr 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

tchen

Tar Uploader

Web

Medium

101 solves

blackade

silence

Misc

Medium

99 solves

admin

OSINT

Misc

Welcome

273 solves

tchen

Message For You

Web

Easy

187 solves

pppp4649

You are my friend

Crypto

Easy

154 solves

hiikunz

Impossible Puzzle

Web

Easy

178 solves

kanon

The Horn

Crypto

Medium

97 solves

ptr-yudai

Pwn

Medium

83 solves

tchen

No Content

Web

Easy

147 solves

ark

1️⃣

Misc

Easy

150 solves

ark

Panic

Web

Medium

120 solves

ptr-yudai

AES is dead

Crypto

Medium

82 solves

pppp4649

pacapaca sc

Pwn

Hard

69 solves

rsk0315

Erased Secret

Misc

Medium

58 solves

tan90909090

Planned topicGeneral

Misc

Easy

kanon

Planned topicBitwise Operations

Crypto

Medium

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for Daily AlpacaHack 4/5-4/11 kakur41 ja AES is dead +6 9 hours ago
Writeup for pacapaca sc tadanobutubutu ja pacapaca sc 19 hours ago
Writeup for Daily AlpacaHack 3/2-3/8 labpump ja Alert my Flag +6 yesterday
Writeup for No Content nozokare ja No Content yesterday
Writeup for Panic nozokare ja Panic yesterday
Writeup for AES is dead nozokare ja AES is dead yesterday
Writeup for AES is dead baumroll1234 ja AES is dead yesterday
Writeup for AES is dead 02loveslollipop en AES is dead yesterday
Writeup for AES is dead tadanobutubutu ja AES is dead yesterday
Writeup for 1️⃣ paulayground ko 1️⃣ 2 days ago

Rows:

pyjs

Topic: Polyglot, SECCONReleased: Feb 28, 2026

82 solves

Misc

Hard

Author:

minaminao

USER	SOLVED AT
chocorusk	last week
binneko	last week
kurenaif	2 weeks ago
nozokare	2 weeks ago
stepbystepbymyself	2 weeks ago
snocc	last month
shiki	last month
liukk	last month
cha-cha	last month
koufu193	last month
mizore-fuyu	last month
amcl-n	last month
tchen	last month
tatu	last month
moon17	last month
som	last month
hiroyuki	last month
lisse47	last month
nomeaning	last month
haihuiliyuyuan	last month
tab	last month
neglect-yp	last month
wakioo1	last month
xnmhuveb	last month
shiragi	last month

Rows:

description solves writeups