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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

127 solves
Rev

by

tan90909090

tan90909090

USER

SOLVED AT

nakamulab

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

2026/05/02 06:48

2026/04/25 10:42

2026/04/17 08:47

2026/04/16 07:30

2026/04/15 03:44

2026/04/09 13:56

2026/04/08 17:20

2026/04/03 15:57

2026/04/01 20:53

2026/04/01 14:21

2026/04/01 12:17

2026/04/01 03:38

2026/03/31 23:21

2026/03/31 14:14

2026/03/31 05:33

2026/03/31 03:29

2026/03/30 14:35

2026/03/29 16:34

Rows:

descriptionsolveswriteups