media key

Part of the encryption key hierarchy that helps provide for a secure and instant wipe. In iOS, iPadOS, tvOS, and watchOS, the media key wraps the metadata on the data volume (and thus without it access to all per-file keys is impossible, rendering files protected with Data Protection inaccessible). In macOS, the media key wraps the keying material, all metadata, and data on the FileVault protected volume. In either case, wipe of the media key renders encrypted data inaccessible.