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Certificate encryption is different from password encryption and is used to verify the identity of the sender of a PDF document. While password encryption allows anyone with the password to access the file, certificate encryption restricts access to a specific list of people. Certificate encryption is considered more secure and is used for sensitive information. To add certificate encryption to a PDF document in Acrobat, use the protect tool in the tool center. Access to recipient certificates is required to share a PDF using certificate encryption.
