A financial services company backs up critical client data to LTO tapes daily. According to their policy, a third-party courier transports these tapes to a secure, offsite storage facility. The security manager is concerned about protecting the confidentiality of the data on the tapes while they are in transit. Which of the following controls is the MOST effective at mitigating the risk of data exposure if a tape is lost or stolen?
Placing the tapes in a tamper-evident, GPS-tracked, locked container.
Encrypting the data on the tapes before they are transported.
Using a bonded and insured courier service for transportation.
Implementing and enforcing a strict chain-of-custody procedure.
Encrypting the data is the most effective control because it directly protects the confidentiality of the information itself. If a tape is lost or stolen, the data remains unreadable to unauthorized parties without the decryption key. While using a bonded courier, employing locked containers, and maintaining chain of custody are important complementary controls for liability, physical security, and accountability, they do not protect the data from being read if the other controls fail and the tape itself is compromised.
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ISC2 CISSP
Security Operations
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