DESlock+ Removable Media Encryption (RME) policy can be complex to configure correctly because of the interaction of both the Workstation Policies and the users' Key File policies.

In basic terms, Workstation Policy will control the default access to removable media, and the Key-File policy configured for the user will override or supersede these policies when the user is logged in. When the user logs out of DESlock+, the Workstation policy will come back into effect.

(RME) can be set to File or FDE. See our article here KB322 - What are the removable media encryption modes - (file / full disk)?

Note: Optical Media can only be File encrypted, if the policy being used is Force Choice Optical Media will automatically be File encrypted.

Key

Throughout this article the following indicators are used to describe access to removable devices

Workstation Policies

The basic three policies that control DESlock+ RME are defined in the Workstation Policy. These are Open, Read-Only and Blocked.

Workstation policy will be in effect:

1. before the user has activated on a workstation; and
2. when an activated user logs out of DESlock+.

You should bear these two scenarios in mind when designing a policy configuration for your organisation.

Using DESlock+ Go when not logged in

If an RME file mode device is connected when the user is not logged into DESlock+ (either because they are not yet activated, or they have logged out) a policy can used to allow or deny access to the device using DESlock+ Go.

NB If this policy allows DESlock+ Go when not logged in, then after the user enters their password they will receive the same access as if they had plugged the device into a workstation without DESlock+. This means that no workstation policies will be applied and thus access via DESlock+ Go may be different than when accessing the device when logged into DESlock+ normally.

Deleting Files

A policy also exists which can allow access to delete or move files when the device is in a Read-Only mode. This can be used to move or delete files, such as in the case where the users wishes to move files from the non-encrypted area to the encrypted area so they can be modified. Or they may wish to simply remove files from the non-encrypted area to make some free space on the device to store more encrypted data.

Key-File Policies

The policies that control DESlock+ RME, defined by the Key-File, are much richer than just Workstation Policy because the Key-File has encryption abilities. Therefore Key-File policy shares the basic modes of Open, Read-Only and Blocked, but it can additionally force encryption in one of three ways: Force FDE = force RME FDE mode encryption; Force file = force RME File mode encryption; or Force choice = Force the user to choose a method of encryption.

DESlock+ group policy also has an additional policy which controls how a RME file mode encrypted device is handled. RME file mode works normally by creating a folder called Encrypted on the root of the stick. Everything in this folder is encrypted, and everything outside this folder is left not-encrypted. This can be useful in a BYOD scenario where you do not wish to encrypt users' personal documents that may already exist on the device, but you which to ensure while in the corporate environment they can securely store data on the device.