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In cryptography, a certificate authority or certification authority (CA) is an entity that stores, signs, and issues digital certificates.A digital certificate certifies the ownership of a public key by the named subject of the certificate.
Certisign’s products and services are mostly in the field of public key infrastructure platforms. They issue digital certificates that are used for authentication of Web sites, as well as users on internal networks through their Identity Management System. Certisign’s IMS has the ability to integrate with Microsoft Active directory.
A certificate authority (CA) that stores, issues and signs the digital certificates; A registration authority (RA) which verifies the identity of entities requesting their digital certificates to be stored at the CA; A central directory—i.e., a secure location in which keys are stored and indexed;
In a typical public-key infrastructure (PKI) scheme, the certificate issuer is a certificate authority (CA), [3] usually a company that charges customers a fee to issue certificates for them. By contrast, in a web of trust scheme, individuals sign each other's keys directly, in a format that performs a similar function to a public key certificate.
DigiCert, Inc. is a digital security company headquartered in Lehi, Utah. [1] DigiCert provides public key infrastructure (PKI) and validation required for issuing digital certificates or TLS/SSL certificates, acting as a certificate authority (CA) and trusted third party.
An example of IdenTrust certificate. IdenTrust, part of HID Global and headquartered in Salt Lake City, Utah, is a public key certificate authority that provides digital certificates to financial institutions, healthcare providers, government agencies and enterprises. [1]
GeoTrust was the first certificate authority [2] to use the domain-validated certificate method [4] US Granted 8028162, Douglas D. Beattie & Christopher T. M. Bailey, "Methods and systems for automated authentication, processing and issuance of digital certificates", published September 27, 2011, assigned to GeoTrust which is now widely accepted and used by all certificate authorities ...
Comodo CA Limited (Sectigo): Based in the City of Salford, Greater Manchester, UK, [8] is a digital certificate authority that issues SSL and other digital certificates. In November 2018, Francisco Partners announced that Comodo Certificate Authority (Comodo CA) is rebranding as Sectigo.