Google has recently enforced a full-disk encryption for their Marshmallow software on new Android phones. In line with the encryption, Google also released an Android Compatibility Definition Document (CCD).
Some devices are exempted from the new encryption such as the tablets and phones that are equipped by older versions of Android, those with no lock screens, as well as those that have no minimum requirement for crypto performance, ARS Technica reported.
Google's CCD exemptions were attributed to devices that have no hardware acceleration required for encryption and decryption, and only features a low-end 32 bit SoCs. Reportedly, Google said that if a device implementation is already launched on an earlier Android version with full-disk encryption disabled by default, such a device cannot meet the requirement through a system software update and thus MAY be exempted.
As for the lock screen feature, it is not compulsory for users to set a lockscreen out of the box since manufacturers are able to secure the encryption with a default passcode, Android Police reported. Google altered the CDD and that it opted not to require encryption.
Meanwhile, a related report stated that the full-disk encryption has been the target of several complaints due to the reduction in the performance of the devices. On the other hand, little or no complaints have been submitted regarding the encryption's security benefits.
Google has yet to identify or provide a list for new devices that, by default, will come with a full-disk encryption. That said, Google's decision is expected to inspire manufacturers to follow through with the encryption requirement.