A company encrypts its disk and individual files while stored. Which deployment category is this?

### Why this is right Disk and file encryption protect information while it is stored. The lesson classifies this as static encryption, or encryption of data at rest. ### The concept Dynamic encryption protects information while it travels through a network. The lesson gives virtual private networks and Transport Layer Security as examples. Static versus dynamic describes the data’s state and location, not the choice between symmetric and asymmetric cryptography. ### The other options - **B. Dynamic encryption of data in transit**: This applies while data is moving between systems, not while it is stored on a disk. - **C. Passive traffic analysis**: This is an attack that observes communication patterns, not a storage-protection method. - **D. Public-key signature verification**: This checks a signature; it is not the category for encrypting stored files. ### Terms - **Data at rest**: Information stored on a device or medium. - **Data in transit**: Information moving across a network. - **Static encryption**: Encryption of stored data, such as disks or files. - **Dynamic encryption**: Encryption of data moving between systems. ### Remember If the information is stored, think static; if it is moving, think dynamic.