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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
29 solves
Submissions (latest 3)
kuroiko

SOLVED!

Sep 23, 7:33 AM

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🌱
2,215 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
42 solves
19-21
hiikunzhiikunz
nested eval
Misc
Hard
45 solves
 
hiikunzhiikunz
nested eval
Misc
Hard
45 solves
22-24
2501
The 3rd
Crypto
Hard
29 solves
25
Coming soon
26
Coming soon
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
1
Coming soon
2
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3
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4
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Writeups

Writeup for nested eval

baumroll1234

ja
nested eval

2026/09/21 23:48

Rows:

Bounds Checking

Topic: Out-of-Bounds WriteReleased: May 10, 2026

97 solves
Pwn
Hard7.5

by

rsk0315

USER

SOLVED AT

zac

2026/08/22 04:20

2026/07/18 12:51

2026/07/15 09:14

2026/07/08 12:33

2026/06/20 11:07

2026/06/19 02:45

2026/06/17 10:29

2026/06/04 14:16

2026/05/31 15:34

2026/05/26 00:49

2026/05/25 10:24

2026/05/23 12:26

2026/05/23 07:18

2026/05/21 02:57

2026/05/15 08:11

2026/05/15 03:56

2026/05/14 18:13

2026/05/12 11:18

2026/05/11 15:40

2026/05/11 11:40

2026/05/11 11:29

2026/05/11 08:41

2026/05/11 08:14

2026/05/11 06:39

2026/05/11 06:27

Rows:

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