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Digital certificates are the attachment to an electronic message used for security purposes.

A certificate is used to verify that a user sending a message is who they claim to be and to bind their public key to them.

Certificates can only be issued by certain trusted entities including Google, Symantec, and Comodo.

The “lock” icon in your browser shows the status of the certificate. The lock indicates that the website is backed by a digital certificate and is a genuine website and is not a fake set up by criminals.