In PKI, what documents prove the association between a digital identity and a public key?

In PKI, what documents prove the association between a digital identity and a public key?

• A. Digital certificates
• B. Software sources
• C. AI
• D. Certificates

Answer: (D)

In PKI, the binding between a digital identity and a public key is established by certificates. A certificate is a digital document issued by a trusted certificate authority that contains the entity’s identifying information, the public key, the issuer’s name, a validity period, and the CA’s digital signature. The CA’s signature vouches that the public key belongs to the stated identity, and you can verify that the certificate is still valid (not expired or revoked) by consulting the CA’s signature and revocation data. Because of this, certificates are the formal artifacts used to prove who a key belongs to, enabling trusted digital signatures, encryption, and authentication. The other options aren’t relevant to proving identity-key binding—software sources are about obtaining software, AI is unrelated, and the term you’ll often hear in practice is digital certificates, which is the same concept as certificates in this context.

In PKI, the binding between a digital identity and a public key is established by certificates. A certificate is a digital document issued by a trusted certificate authority that contains the entity’s identifying information, the public key, the issuer’s name, a validity period, and the CA’s digital signature. The CA’s signature vouches that the public key belongs to the stated identity, and you can verify that the certificate is still valid (not expired or revoked) by consulting the CA’s signature and revocation data.

Because of this, certificates are the formal artifacts used to prove who a key belongs to, enabling trusted digital signatures, encryption, and authentication. The other options aren’t relevant to proving identity-key binding—software sources are about obtaining software, AI is unrelated, and the term you’ll often hear in practice is digital certificates, which is the same concept as certificates in this context.