Ace the 2026 Certified Treasury Pro Test – Cash In on Your Future Brilliance!

The correct answer is the digital certificate, as it plays a crucial role in linking a user's private key to their public key in the context of public key infrastructure (PKI). A digital certificate serves as a credential that contains both the public key and the identity of the key owner, along with other information like the certificate authority's signature, expiration date, and serial number.

The certificate is issued by a trusted third party known as a Certificate Authority (CA), which confirms the authenticity of the public key and the identity of the individual or entity that owns the corresponding private key. This validation process ensures that the keys belong to the correct user, allowing others to trust the public key when it is shared.

While a digital signature is used to validate the authenticity of a message or document, it does not itself bind a private key to a public key. Similarly, a digitized signature is not a standard term in cryptography and does not serve the function of certifying key ownership. A digital token typically refers to an object or entity that represents something of value or an access credential, rather than establishing a relationship between a private and public key.