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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

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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
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2
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3
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Writeups

Writeup for nested eval

baumroll1234

ja
nested eval

18 hours ago

Rows:

high and low

Topic: RNGReleased: Mar 7, 2026

94 solves
Crypto
Hard7.0

by

theoremoon

theoremoon

USER

SOLVED AT

haboro

2026/08/03 13:37

2026/07/13 05:32

2026/07/03 03:19

2026/04/29 15:18

2026/04/27 05:35

2026/04/25 06:44

2026/04/23 08:28

2026/04/10 17:44

2026/04/04 04:26

2026/04/03 20:01

2026/04/02 09:45

2026/03/31 01:48

2026/03/24 20:11

2026/03/24 10:35

2026/03/20 14:18

2026/03/19 18:35

2026/03/15 18:18

2026/03/15 11:25

2026/03/14 20:26

2026/03/13 17:49

2026/03/12 03:45

2026/03/11 04:14

2026/03/11 04:06

2026/03/10 15:43

2026/03/09 05:14

Rows:

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