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There are typically two reasons that motivate a campus web developer to deploy our CA-signed digital certificates.The first reason is to provide encrypted transactions via HTTPS (SSL/TLS over HTTP).A certificate carries with it credentials signed (verified and mastered) by Carnegie Mellon University Computing Services.This means that by issuing a certificate, the University asserts that the web server in question is a registered machine on the University network.It's recently that I started using Comodo Signing Certificate, for signing the software that my new company develops. Email certificates provide the strongest levels of confidentiality and security for your electronic communications by allowing you to digitally sign and encrypt your mail and attachments.Comodo Secure E-Mail Certificates allow you to digitally sign your email as well as encrypt your email messages so that they cannot be read or edited during transmission. Believe it or not, more than 2 million emails on average are sent every second.
Comodo is the world's second largest Certification Authority and our digital Certificates are fully trusted by 99 percent of email clients.
Use of a digital certificate and the SSL/TLS protocol provides a convenient way to contain this threat using a protocol and cryptosystem that is native to nearly every browser and platform.
The second common motivator for using a digital certificate is to provide trust management by means of the credentials carried by the certificate.
Also, multiple computers might host a Web site and each computer can request a certificate with the site's DNS name in the SAN.
This guide describes security best practices for allowing custom SANs in certificates and provides procedures that can be used to request a certificate with a SAN.