Which of the following security mechanisms provides the BEST protection of data when a computer...

Secret key encryption, also known as symmetric encryption, involves a single key for both encryption and decryption. This method provides the best protection for data on a computer that is stolen because it renders the data unreadable without the key. Even if the thief has access to the physical hardware, without the secret key, the data remains secure and inaccessible.

References: ISACA’s resources emphasize the importance of encryption in protecting information assets. Encryption is a critical control for ensuring the confidentiality and integrity of data, especially for devices that may be lost or stolen. The use of secret key encryption is a widely recommended practice for safeguarding sensitive data on mobile devices and laptops as part of an organization’s data protection strategy123.