Client certificates are supported by many web browsers, but most services use passwords and cookies to authenticate users, instead of client certificates.This makes it easier for end-users to validate certificates, and easier for people or organizations that request certificates to know which certificate authorities can issue a certificate that will be broadly trusted.

Most types of certificate can be self-signed.In this instance, end users must rely on the developer of the browser software to manage its built-in list of certificates and on the certificate providers to behave correctly and to inform the browser developer of problematic certificates.Org, in cryptography, a public key certificate, also known as a digital certificate or identity certificate, is an electronic document used to prove the ownership of a public key.

Root programs generally provide a set of valid purposes with the certificates they include.A web browser validates that an https web server is authentic, so that the user can feel secure that his/her interaction with the web site has no eavesdroppers and that the web site is who it claims.Qualified certificate edit Main article: Qualified digital certificate A certificate identifying an individual, typically for electronic signature purposes.