Just like X509 is the standard used to create digital certificate, PKI is the standard used to create digital signatures. Digital signatures are contained within digital certificates. So, when you are creating digital signatures, you can be following both types of standards. Most organizations will choose to use these standards for simplicity. However, other organizations may decide to deviate from these standards, which can lead to compatibility issues down the road.
PKI Standards and X509 Standards Are Followed When Creating Digital Signatures
Both X509 standards and PKI standards can be used when creating digital certificates containing digital signatures. You will just need a certificate authority system configured for generating digital signatures. Whenever a new digital signature is created, it will generate two types of digital certificates. One type of digital certificate will contain the private key and should be issued to the person, whose signature is within the certificate. The other type of digital certificate will contain the public key and is used to authenticate the signature on electronic documents signed by the person.