Question

Exchange 2007 ActiveSync Encryption Policies

Asked by: srelliott2000

My question is in two parts.  First Please explain these three settings beyong the extreme lack of documentation provided by M$.

DeviceEncryptionEnabled
RequireStorageCardEncryption
RequireDeviceEncryption

Their description of 'DeviceEncryptionEnabled' is hilarious and I quote: 'This parameter specifies whether device encryption is enabled. If it is set to true, device encryption is enabled."
(http://technet.microsoft.com/en-us/library/dd251708.aspx)

What are the differences between these three?  My best guesses are:
- DeviceEncryptionEnabled allows you to turn on/off the hardward optional encryption for the mobile device if available.
- RequireStorageCardEncryption forces encryption on/off for any information stored onto a removable flash card.
- RequireDeviceEncryption if enabled ignores 'DeviceEncryptionEnabled' and forces hardware encryption on.

Are these settings only for data on the device?  

Does then SSL cert encrypt the password, username and email for the actual transmission?  Why would we use these ActiveSync settings if SSL is enabled?  Wouldn't we be encrypting the data twice with SSL and ActiceSync both active?  What's best practice?

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Asked On
2009-10-19 at 15:41:52ID24825340
Topics

Exchange Email Server

,

Encryption for Network Security

Participating Experts
2
Points
500
Comments
7

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Answers

 

by: MesthaPosted on 2009-10-19 at 15:53:07ID: 25609680

All SSL is doing is the encryption of the data between the device and the server. If you don't have an SSL certificate in place then everything goes across in the clear because it is http packets.

So one is for the device and one is for the data transfer.

The settings seem quite obvious to me.

Device Encryption Enabled is whether it can be set by the user or not.
Require Device Encryption makes the encryption mandatory.

The storage card thing is also obvious.

Simon.

 

by: srelliott2000Posted on 2009-10-19 at 16:05:16ID: 25609745

Ok, if it were obvious I wouldn't be asking.  Again, DeviceEncryptionEnabled, RequireStorageCardEncryption and RequireDeviceEncryption -- how do they interact?

Does RequireDeviceEncryption override DeviceEncryptionEnabled if set to true?  Is DeviceEncryptionEnabled optional if set to True?

 

by: DelphineousPosted on 2009-10-19 at 16:14:12ID: 25609780

Require Device Encryption forces the device to use encryption.  If the device is not capable of using encryption, it will not be able to use activesync.

Device Encryption Enabled allows encryption but does not require it.

Require Storage Card Encryption requires the storage be encrypted.

 

by: DelphineousPosted on 2009-10-19 at 16:15:14ID: 25609781

>>> Device Encryption Enabled allows encryption but does not require it.

This therefore allows a device incapable of encryption to still communicate not encrypted.

 

by: srelliott2000Posted on 2009-10-19 at 16:20:39ID: 25609805

Where is the M$ documentation for these settings?  It sounds like the obvious answer based upon what the strings themselves say, but I'd like to see the actual docs by M$.

Delphineous, do you know for a fact that RequireDeviceEncryption should over-ride DeviceEncryptionEnabled?

Thank you for your answers in advance.

 

by: DelphineousPosted on 2009-10-19 at 16:33:17ID: 25609866

Absolutely - A "required" setting always takes precidence over an "enabled" feature.  Enabling it simply means it is allowed; Requiring it not only enables it but requires it.

As far as actual Microsoft Documents.  Try these:
http://msdn.microsoft.com/en-us/library/ee159569.aspx
http://msdn.microsoft.com/en-us/library/ee179036.aspx
http://msdn.microsoft.com/en-us/library/ee218138.aspx

Look at the sidebar while you're there, you'll see many other settings too.

 

by: DelphineousPosted on 2009-10-19 at 16:36:04ID: 25609882

SSL handles encrypting the communications between the device and the server.  SSL is not involved with the devices own encryption of data.  Forcing encryption on the storage card helps protect the data from theft if the memory card is stolen.

20120131-EE-VQP-002

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