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Daily AlpacaHack

A CTF challenge series with fun puzzles to enjoy every day

What is Daily AlpacaHack?

We regularly publish simple, beginner-friendly or educational CTF challenges!

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Solve each challenge within its time window to appear on the leaderboard.

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Today's Challenge
tchentchen
Springing
Web
Medium
53 solves
Submissions (latest 3)
yoshy

SOLVED!

Aug 31, 5:20 AM

hiikunz

SOLVED!

Aug 31, 5:13 AM

ahnmo

SOLVED!

Aug 31, 12:27 AM

Leaderboard

Try the first challenge

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

View challenge
admin
AlpacaHack 2100
Misc
Welcome🌱
2,173 solves
Upcoming challenges reveal the , , and in advance.
Prev

Aug 2026

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Upcoming
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27
tchentchen
RFC100008
Web
Easy🌱
145 solves
28
2501
One More Approval
Crypto
Medium
61 solves
29
2501
zen.zip
Misc
Medium
69 solves
30
2501
Anyrunner
Misc
Medium
67 solves
31
tchentchen
Small Image Uploader 2
Web
Medium
63 solves
1
admin
Día Nacional de la Alpaca
Misc
Welcome🌱
240 solves
2
2501
Password, Please
Misc
Easy🌱
206 solves
3-4
arkark
Long Long Flag Printer 2026
Misc
Medium
95 solves
5
pppp4649pppp4649
Happy Birthday
Crypto
Easy🌱
137 solves
6-8
hiikunzhiikunz
AESAESAESAESAESAES
Crypto
Hard
60 solves
9-10
tchentchen
Not so Pyf**k
Misc
Medium
85 solves
 
tchentchen
Not so Pyf**k
Misc
Medium
85 solves
11-12
baumroll1234
Fermat's Last Theorem
Misc
Medium
83 solves
13-15
tchentchen
True or False 2
Misc
Hard
53 solves
16-17
tchentchen
List Sharing
Web
Medium
77 solves
 
tchentchen
List Sharing
Web
Medium
77 solves
18-20
tan90909090tan90909090
wrong instruction
Rev
Hard
59 solves
21-23
tchentchen
Greetings i18n 2
Web
Hard
52 solves
24-26
tchentchen
Xwitter
Web
Hard
40 solves
27-28
tan90909090tan90909090
Let's analyze system calls
Rev
Medium
45 solves
29-31
tchentchen
Springing
Web
Medium
53 solves
 
tchentchen
Springing
Web
Medium
53 solves
1
Coming soon
2
Coming soon
3
Coming soon
4
Coming soon
5
Coming soon
6
Coming soon

Want a harder challenge?

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Writeups

tchen

Writeup for Xwitter

tchen

author
en
Xwitter

2026/08/29 05:39

alpha0314sub

Writeup for Flag is A+B

ja

2026/08/29 01:57

power

Writeup for Encoding Basics

ja

2026/08/26 12:20

power

Writeup for Bars

ja

2026/08/26 08:34

Rows:

Safe Prime

Topic: [Mirror] SECCON Beginners CTFReleased: Dec 13, 2025

293 solves
Crypto

by

ptr-yudai

ptr-yudai

USER

SOLVED AT

mamonbo

2026/08/22 10:38

2026/08/21 12:03

2026/08/15 10:28

2026/08/13 11:18

2026/08/10 18:35

2026/08/04 15:15

2026/08/03 20:50

2026/07/17 13:02

2026/07/16 01:21

2026/07/13 09:27

2026/06/26 15:00

2026/06/16 09:10

2026/06/13 12:57

2026/06/04 02:17

2026/06/01 03:40

2026/05/29 08:40

2026/05/27 13:59

2026/05/27 01:25

2026/05/24 12:08

2026/05/24 06:53

2026/05/21 06:46

2026/05/19 05:30

2026/05/17 05:04

2026/05/15 19:16

2026/05/12 19:53

Rows:

descriptionsolveswriteups