As far as I know, a digital certificate contains information about a user or firm that has been vouched for by a trusted organization.
Digital certificate is a file that ensures holder’s identity and provides security.
If person A holds the digital certificate of person B, can A impersonate B?
How does a digital certificate prevent impersonation by holding other's certificate? For example, when using certificates to authenticate a web server, how can a digital certificate prevent it from impersonating another web server by holding the other's certificate?