Encryption protects data in which scenarios?

• A. While stored on disk (at rest) and while being transmitted (in transit).
• B. Only during transmission.
• C. Only while stored.
• D. Only in memory.

Answer: (A)

Encryption protects data by safeguarding it wherever it lives or travels. It ensures confidentiality for data stored on disk (at rest) so that if a device or storage is stolen or accessed without authorization, the information remains unreadable without the proper keys. It also protects data in transit, such as when it moves across networks, preventing eavesdroppers or interceptors from understanding the content. Being protected in both states gives comprehensive coverage: protecting only during transmission leaves stored data vulnerable, while protecting only when stored leaves data exposed while it’s moving. Some scenarios do involve protecting data in memory, but the most widely recognized coverage for encryption in practice is both at rest and in transit, which is why the best answer includes both.