RSA key length is increased to 2048 bits for AD RMS in Windows 7 or in Windows Server 2008 R2

Applies to: Windows 7 EnterpriseWindows 7 ProfessionalWindows 7 Ultimate More

Introduction


This article introduces a hotfix that increases the length of RSA keys for Active Directory Rights Management Services (AD RMS) to 2048 bits on a computer that is running Windows 7 or Windows Server 2008 R2. Currently, AD RMS uses RSA keys that are 1024 bits long for encryption. Additionally, the hashing algorithm is updated from SHA-1 to SHA-256.

Resolution


To resolve this issue, if you are using Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1 or a later version, install the following update:
2843630 Update helps unmanaged Office 2010 users work with Microsoft RMS in Windows
If you are using Windows 7 RTM or Windows Server 2008 R2 RTM, use the hotfix that is described in this article.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

There is no prerequisite to apply this hotfix in Windows 7 RTM or Windows Server 2008 R2 RTM.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

Status


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information


For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates