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)

neglect-yp

SOLVED!

Mar 6, 11:50 AM

omame3

SOLVED!

Mar 6, 11:39 AM

tab

SOLVED!

Mar 6, 11:18 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.

Dec 2025

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

admin

AlpacaHack 2100

Misc

Welcome

1,348 solves

xornet

a fact of CTF

Crypto

Easy

772 solves

ark

Emojify

Web

Medium

525 solves

minaminao

Leaked Flag Checker

Rev

Easy

505 solves

mora

Integer Writer

Pwn

Hard

291 solves

n01e0

simpleoverflow

Pwn

Easy

448 solves

jp3bgy

size limit

Crypto

Medium

287 solves

yu212

Fully Padded RSA

Crypto

Hard

221 solves

ark

hit-and-miss

Misc

Easy

347 solves

xrekkusu

Read Assembly

Rev

Medium

291 solves

hiikunz

Alpaca Bank

Web

Medium

302 solves

chocorusk

Sugoi Flag Checker

Rev

Hard

192 solves

ptr-yudai

Safe Prime

Crypto

Medium

240 solves

iwashiira

power_obfus_royalty

Rev

Medium

194 solves

hiikunz

Flag Printer 2100

Rev

Medium

228 solves

ark

🐈

Web

Medium

286 solves

ptr-yudai

Pwn

Medium

232 solves

kanon

Twilight

Rev

Medium

214 solves

k0080

alloc-101

Pwn

Hard

202 solves

fabon

omikuji

Web

Medium

228 solves

RSA debug?

Crypto

Medium

179 solves

tchen

Log Viewer

Web

Medium

212 solves

hiikunz

Rotten Beef

Pwn

Medium

186 solves

minaminao

cat3

Misc

Medium

205 solves

hiikunz

Xmas Login

Web

Easy

305 solves

tchen

Useful Machine

Rev

Hard

150 solves

n01e0

simpleoverwrite

Pwn

Medium

176 solves

hi120ki

cha-ll-enge

Rev

Medium

142 solves

kanon

one-p-rsa

Crypto

Easy

209 solves

soon-haari

RBG

Crypto

Very Hard

118 solves

admin

108

Misc

Easy

265 solves

admin

Happy New Year

Misc

Welcome

497 solves

kanon

super-tomato

Crypto

Easy

344 solves

hiikunz

Ruby Flag Checker

Rev

Easy

264 solves

minaminao

Fushigi Crawler

Web

Easy

304 solves

Want a harder challenge?

Go to B-SIDE

Writeups

Author's Writeup for Flag Printer 2026 minaminao author ja Flag Printer 2026 23 hours ago
Writeup for Bars baumroll1234 ja Bars 2 days ago
Writeup for pyjs rqda en pyjs 4 days ago
Writeup for pyjs tchen en pyjs 4 days ago
Writeup for pyjs hiikunz ja pyjs 4 days ago
Writeup for pyjs rsk0315 ja pyjs 5 days ago
Writeup for Daily AlpacaHack 2/22-2/28 kakur41 author ja Noob programmer +6 5 days ago
Writeup for pyjs toomer en pyjs 5 days ago
Writeup for One Byte Padding Oracle Attack baumroll1234 ja One Byte Padding Oracle Attack 5 days ago
Writeup for pyjs baumroll1234 ja pyjs 5 days ago

Rows:

AAAAAAAAEEEEEEEESSSSSSSS

Topic: AESReleased: Feb 12, 2026

108 solves

Crypto

Medium

Author:

hiikunz

Show Tags

🦙🦙🦙🦙🦙🦙🦙🦙

server.py

description solves writeups