What is mutual authentication?
Also called two-way authentication, mutual authentication is when both sides of a transaction authenticate each other simultaneously. Online, this is often used to prevent fraud by requiring both the user’s web browser and a web site’s server to prove their identities to each other.
How does mutual authentication work?
Both parties must prove their identities before any application data is sent. Mutual authentication the default mode of authentication in some encrypted protocols like SSH and IKE, but is optional in others like SSL.