read-a-binary

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Rows:

CHALLENGE	AUTHORS	SOLVES (CURRENT)	SOLVE RATE (AT CONTEST TIME)
Welcome Misc	admin	1456 solves	-
AlpacaHack 2100 Misc Daily AlpacaHack	admin	1348 solves	-
a fact of CTF Crypto Daily AlpacaHack	xornet	772 solves	-
Simple Login Web AlpacaHack Round 2 (Web)	ark	588 solves	Top 28% = 84/300 users
Emojify Web Daily AlpacaHack	ark	525 solves	-
Leaked Flag Checker Rev Daily AlpacaHack	minaminao	505 solves	-
simpleoverflow Pwn Daily AlpacaHack	n01e0	448 solves	-
hit-and-miss Misc Daily AlpacaHack	ark	347 solves	-
echo Pwn AlpacaHack Round 1 (Pwn)	ptr-yudai	345 solves	Top 32% = 56/174 users
super-tomato Crypto Daily AlpacaHack	kanon	344 solves	-
Xmas Login Web Daily AlpacaHack	hiikunz	305 solves	-
Fushigi Crawler Web Daily AlpacaHack	minaminao	304 solves	-
Alpaca Bank Web Daily AlpacaHack	hiikunz	302 solves	-
Read Assembly Rev Daily AlpacaHack	xrekkusu	291 solves	-
Integer Writer Pwn Daily AlpacaHack	mora	291 solves	-
size limit Crypto Daily AlpacaHack	jp3bgy	287 solves	-
🐈 Web Daily AlpacaHack	ark	286 solves	-
Encoding Basics Misc Crypto Daily AlpacaHack	kurenaif	285 solves	-
Treasure Hunt Web AlpacaHack Round 7 (Web)	ark	266 solves	Top 15% = 71/458 users
108 Misc Daily AlpacaHack	admin	265 solves	-

Rows:

197 solves

Author:

tan90909090

🦙 < Let's try reading what the ELF binary does!

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 file is the ELF binary read-a-binary.
The goal is to find an input (the flag) that makes the binary print Correct! by analyzing the binary.
There are a variety of tools available that can analyze ELF binaries.
Some tools can show a higher level of representations than others.