IMAGE B is a copy of IMAGE A with a few bytes altered. Move the cursor over IMAGE B and mark every byte that differs before your strikes or the connection time out.
↑↓←→ move ENTER mark
or press SPACE / ENTER
CONNECTION SECURE
DIFF COMPLETE
Every altered byte was located.
or press SPACE / ENTER
CONNECTION LOST
DIFF FAILED
Out of strikes — the firewall flagged the intrusion.