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==Authentication==
==Authentication==
Almost all the browsers present today are able to detect if certificate of certain website is expired or it does not have the certificate signed by a known company. In that case a warning message usually appears on the first page saying the problem with the certificate. One can then move on to the website or leave the page right there.
Almost all the browsers present today are able to detect if certificate of certain website is expired or it does not have the certificate signed by a known company. In that case a warning message usually appears on the first page saying the problem with the certificate. One can then move on to the website or leave the page right there.
[[VeriSign]] and [[DigiCert]] are two known companies in the field of digital certificates. Rest of the reliable companies' list can be read [https://spreadsheets.google.com/pub?key=ttwCVzDVuWzZYaDosdU6e3w&single=true&gid=0&output=html here] and [http://www.dmoz.org/Computers/Security/Public_Key_Infrastructure/PKIX/Tools_and_Services/Third_Party_Certificate_Authorities/ here].<ref>[http://www.namecheap.com/support/knowledgebase/article.aspx/334/38/what-is-certificate-authority-ca NameCheap]</ref>
[[VeriSign]] and [[DigiCert]] are two known companies in the field of digital certificates. Rest of the reliable companies' list can be read [https://spreadsheets.google.com/pub?key=ttwCVzDVuWzZYaDosdU6e3w&single=true&gid=0&output=html here] and [http://www.dmoz.org/Computers/Security/Public_Key_Infrastructure/PKIX/Tools_and_Services/Third_Party_Certificate_Authorities/ here].<ref>[http://www.namecheap.com/support/knowledgebase/article.aspx/334/38/what-is-certificate-authority-ca NameCheap]</ref>
==Public Key Infrastructure==
A certificate authority is does not issue certificates only. Its a part of Public Key Infrastructure ([[PKI]]). Basically a PKI issues and manages security certificates, credential verification, and public key encryption assignments. A CA verifies the credentials of the requester through a registration authority ([[RA]]) and as a part of PKI process, a public key is assigned for encryption. As a last step, an [[SSL Certificate]] is issued encrypted with a digital signature to attest the identity of the requester.<ref>[http://www.entrust.com/certification-authority.htm Entrust]</ref>
==References==
==References==
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