Spear Phishing attacks commonly attempt to impersonate email from trusted entities. What security device is used

Question

Question: Spear Phishing attacks commonly attempt to impersonate email from trusted entities. What security device is used in email to verify the identity of sender?

Answer 1

Digital Signatures

Spear Phishing attacks commonly attempt to impersonate email from trusted entities. Digital Signatures is used in email to verify the identity of sender.