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In computer security, digital certificates are verified using a chain of trust. [1] The trust anchor for the digital certificate is the root certificate authority (CA).. The certificate hierarchy is a structure of certificates that allows individuals to verify the validity of a certificate's issuer.
For example, in a hierarchical PKI, a certificate chain starting with a web server certificate might lead to a small CA, then to an intermediate CA, then to a large CA whose trust anchor is present in the relying party's web browser. In a bridged PKI, a certificate chain starting with a user at Company A might lead to Company A's CA certificate ...
A certificate chain (see the equivalent concept of "certification path" defined by RFC 5280 section 3.2) is a list of certificates (usually starting with an end-entity certificate) followed by one or more CA certificates (usually the last one being a self-signed certificate), with the following properties:
The certificate is also a confirmation or validation by the CA that the public key contained in the certificate belongs to the person, organization, server or other entity noted in the certificate. A CA's obligation in such schemes is to verify an applicant's credentials, so that users and relying parties can trust the information in the issued ...
Diagram illustrating the chain of trust of a digital certificate, showing the hierarchy from the root CA to the end-entity certificate.. Certificate path validation is a crucial process in PKI that ensures the authenticity and trustworthiness of a digital certificate.
In the X.509 architecture, a root certificate would be the trust anchor from which the whole chain of trust is derived. The trust anchor must be in the possession of the trusting party beforehand to make any further certificate path validation possible.
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The Certification Authority Browser Forum, also known as the CA/Browser Forum, is a voluntary consortium of certification authorities, vendors of web browsers and secure email software, operating systems, and other PKI-enabled applications that promulgates industry guidelines governing the issuance and management of X.509 v.3 digital certificates that chain to a trust anchor embedded in such ...