Ruby Flag Checker

Show TagsShow Solved

Rows:

CHALLENGE	AUTHORS	SOLVES (CURRENT)	SOLVE RATE (AT CONTEST TIME)
Welcome Misc	admin	1428 solves	-
AlpacaHack 2100 Misc Daily AlpacaHack	admin	1250 solves	-
a fact of CTF Crypto Daily AlpacaHack	xornet	737 solves	-
Simple Login Web AlpacaHack Round 2 (Web)	ark	570 solves	Top 28% = 84/300 users
Emojify Web Daily AlpacaHack	ark	499 solves	-
Leaked Flag Checker Rev Daily AlpacaHack	minaminao	480 solves	-
simpleoverflow Pwn Daily AlpacaHack	n01e0	426 solves	-
echo Pwn AlpacaHack Round 1 (Pwn)	ptr-yudai	339 solves	Top 32% = 56/174 users
super-tomato Crypto Daily AlpacaHack	kanon	325 solves	-
hit-and-miss Misc Daily AlpacaHack	ark	314 solves	-
Alpaca Bank Web Daily AlpacaHack	hiikunz	288 solves	-
Xmas Login Web Daily AlpacaHack	hiikunz	287 solves	-
Integer Writer Pwn Daily AlpacaHack	mora	283 solves	-
Fushigi Crawler Web Daily AlpacaHack	minaminao	282 solves	-
Read Assembly Rev Daily AlpacaHack	xrekkusu	278 solves	-
size limit Crypto Daily AlpacaHack	jp3bgy	277 solves	-
Encoding Basics Misc Crypto Daily AlpacaHack	kurenaif	272 solves	-
🐈 Web Daily AlpacaHack	ark	270 solves	-
Treasure Hunt Web AlpacaHack Round 7 (Web)	ark	265 solves	Top 15% = 71/458 users
108 Misc Daily AlpacaHack	admin	252 solves	-

Rows:

250 solves

Author:

hiikunz

Show Tags

🦙 < I created a flag checker using the Ruby programming language.

Beginner Hint

This challenge is in the Rev (Reverse Engineering) category.
Flag checkers are a common theme in Rev problems.
A flag checker executable or script accepts player input and tells you whether it matches the flag.
The provided files are the Ruby source main.rb.
The goal is to find an input (the flag) that makes the program print Correct!.