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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
2501
The 3rd
Crypto
Hard
25 solves
Submissions (latest 3)
prof

SOLVED!

Sep 22, 3:03 PM

Leaderboard

Try the first challenge

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

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admin
AlpacaHack 2100
Misc
Welcome🌱
2,214 solves
Upcoming challenges reveal the , , and in advance.
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Sep 2026

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tchentchen
Springing
Web
Medium
74 solves
1
admin
QUIZ ALPACASHOCK
Misc
Welcome🌱
126 solves
2
hiikunzhiikunz
base 16-32-64
Misc
Easy🌱
102 solves
3-4
tan90909090tan90909090
Let's Shut Down Linux
Misc
Medium
63 solves
5
baumroll1234
6-8
minaminaominaminao
Bitflip RSA
Crypto
Hard
56 solves
 
minaminaominaminao
Bitflip RSA
Crypto
Hard
56 solves
9-11
minaminaominaminao
\^o^/
Misc
Hard
43 solves
12-13
tan90909090tan90909090
sin function vs. fsin instruction
Rev
Misc
Medium
55 solves
14-15
tan90909090tan90909090
integer division
Misc
Medium
70 solves
16-18
edwowmathedwowmath
neighboRhood_diStAnce
Crypto
Hard
41 solves
19-21
hiikunzhiikunz
nested eval
Misc
Hard
43 solves
 
hiikunzhiikunz
nested eval
Misc
Hard
43 solves
22-24
2501
The 3rd
Crypto
Hard
25 solves
25
Coming soon
26
Coming soon
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
1
Coming soon
2
Coming soon
3
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4
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Writeups

Writeup for nested eval

baumroll1234

ja
nested eval

18 hours ago

Rows:

guess.js

Topic: JavaScriptReleased: Mar 8, 2026

113 solves
Misc
Hard4.5

by

ark

ark

USER

SOLVED AT

bigmc1971

2026/08/23 13:46

2026/08/03 15:51

2026/07/17 16:10

2026/06/30 16:43

2026/06/13 12:33

2026/05/21 04:51

2026/04/29 15:19

2026/04/27 05:28

2026/04/25 06:54

2026/04/24 07:34

2026/04/09 12:44

2026/04/05 09:13

2026/04/02 14:03

2026/04/02 10:09

2026/04/01 10:50

2026/03/30 16:53

2026/03/27 18:46

2026/03/27 07:21

2026/03/23 01:19

2026/03/22 13:13

2026/03/19 23:03

2026/03/19 17:27

2026/03/18 17:34

2026/03/18 17:19

2026/03/16 08:52

Rows:

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