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I am trying to understand the term end-entity. Does this term just mean anybody that plays a role in a PKI system that is not a CA? So if I request a certificate from A who is a CRL issuer for Verisign then am I an end entity to verisign? Is A?

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An end-entity certificate is a certificate which is not used to validate signatures on other certificates, i.e. a certificate which does not contain a CA public key (its Basic Constraints extension is absent, or contains a cA flag with value FALSE). It is called "end-entity" because it appears, necessarily, at the end of a certificate path.

A CRL issuer certificate, i.e. a certificate for some entity who signs CRL (on behalf of a CA), can be an end-entity certificate, since signing CRL does not require to be a CA.

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