The encryption type for password protected Office 97 thru Office 2003 must be set.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-238029	DTOO190	SV-238029r650654_rule		Medium

Description
This policy setting enables you to specify an encryption type for password-protected Office 97-2003 files. If you enable this policy setting, you can specify the type of encryption that Office applications will use to encrypt password-protected files in the older Office 97-2003 file formats. The chosen encryption type must have a corresponding cryptographic service provider (CSP) installed on the computer that encrypts the file. See the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\Defaults\Provider\ registry key for a list of CSPs installed on the local computer. Specify the encryption type to use by entering it in the provided text box in the following form:<Encryption Provider>,<Encryption Algorithm>,<Encryption Key Length>.For example, Microsoft Enhanced Cryptographic Provider v1.0,RC4,128. If you do not configure this policy setting, Excel, PowerPoint, and Word use Office 97/2000 Compatible encryption, a proprietary encryption method, to encrypt password-protected Office 97-2003 files.

Description

This policy setting enables you to specify an encryption type for password-protected Office 97-2003 files. If you enable this policy setting, you can specify the type of encryption that Office applications will use to encrypt password-protected files in the older Office 97-2003 file formats. The chosen encryption type must have a corresponding cryptographic service provider (CSP) installed on the computer that encrypts the file. See the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\Defaults\Provider\ registry key for a list of CSPs installed on the local computer. Specify the encryption type to use by entering it in the provided text box in the following form:<Encryption Provider>,<Encryption Algorithm>,<Encryption Key Length>.For example, Microsoft Enhanced Cryptographic Provider v1.0,RC4,128. If you do not configure this policy setting, Excel, PowerPoint, and Word use Office 97/2000 Compatible encryption, a proprietary encryption method, to encrypt password-protected Office 97-2003 files.

STIG	Date
Microsoft Office System 2016 Security Technical Implementation Guide	2021-06-23

Details

Check Text ( C-41239r650652_chk )
Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2016 -> Security Settings "Encryption type for password protected Office 97-2003 files" is set to "Enabled (Microsoft Enhanced RSA and AES Cryptographic Provider,AES 256,256)". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\16.0\common\security Criteria: If the value DefaultEncryption12 is REG_SZ = "Microsoft Enhanced RSA and AES Cryptographic Provider,AES 256,256", this is not a finding.

Check Text ( C-41239r650652_chk )

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2016 -> Security Settings "Encryption type for password protected Office 97-2003 files" is set to "Enabled (Microsoft Enhanced RSA and AES Cryptographic Provider,AES 256,256)".

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

HKCU\Software\Policies\Microsoft\Office\16.0\common\security

Criteria: If the value DefaultEncryption12 is REG_SZ = "Microsoft Enhanced RSA and AES Cryptographic Provider,AES 256,256", this is not a finding.

Fix Text (F-41198r650653_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2016 -> Security Settings "Encryption type for password protected Office 97-2003 files" to "Enabled (Microsoft Enhanced RSA and AES Cryptographic Provider,AES 256,256)".