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When a user receives a signed digital certificate, decryption of the certificate occurs with the public key of:
Receiver.
Certificate repository.
Registration authority (RA).
Certificate authority (CA).
A CA is a network authority that issues and manages security credentials and public keys for message encryption. As a part of the public key infrastructure, a CA checks with an RA to verify information provided by the requestor of a digital certificate. If the RA verifies the requestor's information, the CA can issue a certificate. The CA signs the certificate with its private key for distribution to the user. Upon receipt, the user will decrypt the certificate with the CA's public key.
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