Which statement best describes the requirement for encrypting transmissions of cardholder data?

Which statement best describes the requirement for encrypting transmissions of cardholder data?

• A. Documented, in use, and known to all affected parties.
• B. Only documented but not in use.
• C. Must be archived and unused.
• D. Not required to be known by affected parties.

Answer: (D)

The key idea is that cardholder data must be protected in transit by using encryption when it moves across open networks. The requirement is about putting a working encryption control in place, not about informing every affected party that encryption is being used. So the statement that encryption does not need to be known by those affected best captures the practical point: the technical safeguard is what matters, not message dissemination. Why the other options don’t fit: encryption isn’t satisfied by merely documenting it or by keeping it unused—if data is transmitted, strong encryption must actually be in use. The option suggesting it must be archived and unused contradicts the purpose of encryption altogether, which is to protect data in motion, not to render it inaccessible by never using the protection.

The key idea is that cardholder data must be protected in transit by using encryption when it moves across open networks. The requirement is about putting a working encryption control in place, not about informing every affected party that encryption is being used. So the statement that encryption does not need to be known by those affected best captures the practical point: the technical safeguard is what matters, not message dissemination.

Why the other options don’t fit: encryption isn’t satisfied by merely documenting it or by keeping it unused—if data is transmitted, strong encryption must actually be in use. The option suggesting it must be archived and unused contradicts the purpose of encryption altogether, which is to protect data in motion, not to render it inaccessible by never using the protection.