|The Open–source PKI Book: A guide to PKIs and Open–source Implementations|
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Alice sends her certificate request to the Registration Authority for its signature. Any action of approval or disapproval takes place at the Registration Authority. Then, the RA sends the request to the CA for policy approval and to be signed. The result of the signing –– the Certificate –– is sent back to Alice through the Registration Authority. They also are often stored on a Directory Server.