Outlook minimum encryption key length settings must be set.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-26636	DTOO316	SV-54064r1_rule		Medium

Description
This setting allows the minimum key length for an encrypted email message to be configured.

STIG	Date
Microsoft Outlook 2013 STIG	2018-09-05

Details

Check Text ( C-48004r1_chk )
Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Security -> Cryptography "Minimum encryption settings" is set to "Enabled: 168 bits". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\outlook\security Criteria: If the value MinEncKey is REG_DWORD = 168, this is not a finding.

Check Text ( C-48004r1_chk )

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Security -> Cryptography "Minimum encryption settings" is set to "Enabled: 168 bits".

Procedure: Use the Windows Registry Editor to navigate to the following key:

HKCU\Software\Policies\Microsoft\Office\15.0\outlook\security

Criteria: If the value MinEncKey is REG_DWORD = 168, this is not a finding.

Fix Text (F-46944r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Security -> Cryptography "Minimum encryption settings" to "Enabled: 168 bits".