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The purpose of a Registration Authority (RA) is primarily to handle the task of registering users and issuing keys. The RA acts as a mediator between the end-users and the Certificate Authority (CA) by verifying the identity of individuals or entities requesting a digital certificate. Once the RA confirms the identity of the requester, it can facilitate the issuance of public keys that are tied to those verified identities.

In this context, the RA plays a vital role in establishing the trustworthiness of the public keys that will be used in secure communications. By ensuring that the keys are issued only to validated users, the RA helps maintain the integrity of the overall public key infrastructure (PKI).

Other options relate to responsibilities that belong either directly to the CA or to different functions within a PKI. For instance, revoking public keys is a function typically managed by the CA, which ensures that no compromised keys remain valid. Certifying certificates issued by a CA falls under the CA's functions itself, as the CA is the entity responsible for issuing certificates and maintaining the trust chain. Validating signatures on documents is an activity that is usually performed by the end-users or relying parties but is not a primary role of the RA.

Overall, the RA's key function is centered around