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Comparison and difference between CAs

Çağlar Arlı      -    15 Views

Comparison and difference between CAs

While doing some Google searches, I learnt that there are a lot of different Certification Authorities like the Windows role named "Active Directory Certificate Services", the OpenSSL library or the EJBCA software.

I would like to know the differences between them knowing that they all issues certificates and act as a certification authority if I'm not wrong?

Do they work differently? Are they all compliant with X.509 for example?