Overview
Text file appears blank in text editors but has non-zero size, containing spaces, tabs, and newlines.
Reconnaissance
Run cat -A chall.txt to visualize tab (^I) and newline markers.
Exploitation Strategy
Decode payload using Whitespace programming language interpreter to recover flag.
Solution Code
cat -A chall.txt
# Decode Whitespace code -> hwj{a_wh1t3_ch4ll3ng3}Flag
hwj{a_wh1t3_ch4ll3ng3}