AlpacaHack Logo

Tag: Flag Checker

Sign InSign Up
Flag Checker

Flag checkers are a common type of challenge in the Reverse Engineering category.

An executable or script called a flag checker takes the player's input and outputs whether that input matches the flag.

These challenges may also be called "crackmes" in a broader sense. (automatically translated from Japanese)

minaminao
·Updated May 3, 2026
Flag Checker Challenges

Ruby Flag Checker

Daily AlpacaHackTopic: RubyReleased: Jan 3, 2026

343 solves
Rev

by

hiikunz

hiikunz

USER

SOLVED AT

thecyberskid

thecyberskid

2026/08/31 20:16

2026/08/27 14:07

2026/08/26 14:03

2026/08/23 07:40

2026/08/23 00:30

2026/08/20 07:57

2026/08/16 05:47

2026/08/16 03:33

2026/08/11 23:25

2026/08/11 14:04

2026/08/10 02:30

2026/08/09 07:54

2026/08/08 11:20

2026/08/05 11:28

2026/08/04 20:34

2026/08/01 23:59

2026/07/29 13:30

2026/07/29 10:38

2026/07/29 04:30

2026/07/27 15:24

2026/07/11 11:28

2026/07/11 10:27

2026/07/09 07:39

2026/07/07 00:55

2026/07/01 03:01

Rows:

descriptionsolveswriteups