digital certificate(redirected from X.509)
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digital certificateDigital ID Informatics An official electronic identity document based on public/private key encryption and obtained through a certificate authority; includes user's name and registered serial number, user's public key and expiration date. See HIPAA. Cf Digital signature.
A unique identifier assigned to a single computer user for use during secure electronic transactions, e.g., when gaining access to private health information or ordering laboratory tests for patients. Synonym: electronic certificate