Many Linux distributions including those used in off the shelf Network Attached Storage (NAS) devices have the ability to protect users’ data with one or more types of encryption. Full-disk and folder-based encryption options are commonly available, each with its own set of pros and contras. The new native ZFS encryption made available in OpenZFS 2.0 is designed to combine the benefits of full-disk and folder-based encryption without the associated drawbacks. In this article, we’ll compare the strengths and weaknesses of LUKS, eCryptFS and ZFS encryption.

Thecus has been manufacturing NAS devices for more than 15 years. The company develops an in-house Linux-based NAS OS, the ThecusOS. At this time, the most current version of the OS is ThecusOS 7. Thecus advertises secure data encryption in most of its NAS devices. The company’s volume-based encryption tool allows users to fully encrypt their entire RAID volume, defending essential data in instances of theft of the physical device. We found Thecus’ implementation of encryption somewhat unique. In this research, we’ll verify the manufacturer’s claims and check just how secure is Thecus’ implementation of 256-bit AES encryption.