This policy setting allows you to configure the time stamping hashing algorithm used by Office 2010 applications to validate ...

This policy setting allows you to configure the time stamping hashing algorithm used by Office 2010 applications to validate a message or document.
 
If you enable this policy setting, you can specify any of the following standard hashing algorithm (SHA) functions:
- SHA1
- SHA256
- SHA384
- SHA512

If you disable or do not configure this policy setting, SHA1 will be used.