проверка подлинности на основе сертификата(A form of IIS authentication in which IIS accepts client-certificates used to prove the client's identity. Using this form of authentication, IIS can optionally map a client certificate to a Windows user account by using an internal mapping table or Active Directory)
проверка подлинности с сопоставлением SSL-сертификатов клиентов(A method of authentication where certificates are used on the client and a mapping is made on the server (or possibly on the Active directory domain controller) to determine which client certificates should be allowed access to the site)
