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Tag: Flag Checker

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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

Optimized expression

Daily AlpacaHackTopic: OptimizationReleased: Mar 26, 2026

145 solves
Rev

by

tan90909090

tan90909090

USER

SOLVED AT

a2zog

2026/08/30 17:37

2026/08/27 12:58

2026/08/27 11:34

2026/08/27 04:03

2026/08/26 16:29

2026/08/26 08:41

2026/08/23 00:19

2026/08/20 18:08

2026/08/10 15:52

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2026/08/09 12:00

2026/07/29 06:01

2026/07/14 20:57

2026/07/14 00:47

2026/07/10 06:25

2026/07/09 17:53

2026/07/06 02:07

2026/06/28 05:56

2026/06/15 10:49

2026/06/10 17:46

2026/06/08 12:09

2026/06/02 10:12

2026/05/31 13:00

2026/05/16 05:16

2026/05/10 15:17

Rows:

descriptionsolveswriteups