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Which extensions can have a certificate?

Certificate extensions were introduced in version 3. They will add flexibility to the past quite a limited format of the certificate. Each extension includes a unique object identifier (OID), criticality identifier, and value, which is the structure of ASN.1. An

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All about SSL

This site is dedicated to SSL-certificates. You will learn what is an SSL certificate, how to issue and reissue it. FAQ SSL will be useful for both novices and pros. SSL Knowledgebase contains sections on validation, trust logo, vulnerabilities, SSL-certificates differences by type (Wildcard, EV, DV, etc.), as well as many other things.