What is the encryption method used to protect data on mobile devices?

• A. Data at rest
• B. Email encryption
• C. Mobile device encryption
• D. Mobile application encryption

Answer: (C)

Mobile device encryption is the method that protects data stored on a phone or tablet by encrypting the entire device storage so its contents stay unreadable without the proper unlock credential. This is especially important if the device is lost or stolen, because even if the storage is accessed, the data remains protected behind the decryption key tied to user authentication. This approach covers the whole device, unlike email encryption (which protects email content) or mobile application encryption (which protects data within a single app). Data at rest describes where data resides rather than how it’s protected, so mobile device encryption is the appropriate choice for safeguarding on-device data.