| Security Education Companion Skip to main content
Security Education Companion
A free resource for digital security educators

Security certificate

A way to confirm automatically that a public key is correct (is really the one that's used by a particular entity), in order to prevent man-in-the-middle attacks. Most often used by web sites to prove to your browser that you have a secure connection to the real site, and not to some other system that's tampering with your connection.