CodeFest CTF 2017 - The Eights Writeup

by rop2bash
September 23, 2017

Another PNG this time with a black and white squares pattern.

Again a contrast and brightness trick.

This time we encounter a strange pattern. If we think of the pure black parts as 0 and the black and white ones as 1 we get some binary code for each line.

Bin	Hex	ASCII
01010100	0x54	T
01001000	0x48	H
01000101	0x45	E
01000011	0x43	C
01001111	0x4f	O
01000100	0x44	D
01000101	0x45	E
01010010	0x52	R

and it repeats itself.

-> flag{THECODER}