In the case of PDF documents, a list of default CAs is distributed with PDF applications which support digital signatures. linked to e-ID card schemes), or publicly available online. There are many CAs worldwide, and they can be either enterprise-based, industry-based, national (e.g. This bond is secured by the CA using the CA's own private key with a digital signature. The role of the CA is to issue digital certificates to individuals within a PKI program that shows that a particular public key belongs to a specific individual–so you can claim that digital certificates bind the identity of the individual to their public key.

If the information is correct, the certificate is verified.īefore you use the public key of someone to verify a signature, you need proof that it truly belongs to them. Together with the registration authority (RA), the CA is part of the public key infrastructure (PKI), which verifies the information provided by an electronic certificate requester. A certificate authority (CA) is an entity maintaining and issuing security certificates and public keys that are used in a public network for protected communication.

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