A Certificate Key Matcher is a tool used to verify the identity of a person or organization by matching the public key included in their certificate with the private key that corresponds to that public key. This allows them to ensure they are connecting to the right person or organization.
There are two types of Certificate Key Matchers: one that verifies the identity of a person and one that verifies the identity of an organization. The most common use for a Certificate Key Matcher is to verify the identity of someone who has access to sensitive information. For example, a web server operator might have access to their own private key, but may not trust their employees with it. A Certificate Key Matcher can be used to verify that the user is who they claim to be before allowing them access to sensitive information.
Another common use for a Certificate Key Matcher is verifying the identity of an organization. For example, an administrator may want to ensure that a third-party vendor is actually who they say they are before allowing them access to sensitive information. In this case, the administrator would first create a public/private key pair (certificate and private key) for the vendor and then use their Certificate Key Matcher tool to verify that the private key matches both their expected public key and the actual private key provided by the vendor.