So, the door is open, now you have to verify that the person waiting to get in is who they say they are. This is your multi-factor authentication. It’s the second step to verifying before someone is allowed inside.
A CEO scam is an attack that attempts to disguise a phishing email as legitimately coming from the CEO or high official in your company. These attacks are very clever and prey on your workers by relying on a sense of urgency to accomplish the goal.