: Once extracted, the contents—often images, logs, or executables—usually contain a "flag" (a specific string like CTF{...} ) or a hidden message.
: Use tools like 7-Zip (Windows), ZArchiver (Android), or the 7z command in Linux terminal.
: If the file prompts for a password, check the challenge description for clues or use a tool like john (John the Ripper) or hashcat to attempt a recovery if it's a known CTF challenge.