Which of the following encryption methods is being described when a secure encrypted tunnel is created between a host and a storage device, but the data stored on disk is not encrypted?

Data At-Rest Encryption specifically refers to encrypting data when it is stored on persistent media, which is explicitly stated not to be the case in this scenario.

Host Encryption is a broader term; while a host performs in-flight encryption, this option does not specifically capture the 'encrypted tunnel' and 'not stored on disk' aspects as accurately as 'Data In-Flight Encryption'.

While network encryption is the mechanism, 'Data In-Flight Encryption' is the more precise and commonly used term to describe the protection of data while it traverses the network.

Data In-Flight Encryption (or data in-transit encryption) secures data while it is moving across a network between two points, such as a host and a storage device, often using protocols that create an encrypted tunnel. This method specifically protects the data during transmission, without necessarily encrypting the data at rest on the storage device.