This article describes an issue that occurs when you use the CryptDuplicateKey function to duplicate an RC2 40-bit key in Windows 8.1 or Windows Server 2012 R2. You can fix this issue by using the update in this article. Before you install this update, check out the Prerequisites section.

How to get this update

Important If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

Method 1: Windows Update

This update is provided as a Recommended update on Windows Update. For more information on how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Download Center

The following files are available for download from the Microsoft Download Center:

Operating system

Update

All supported x86-based versions of Windows 8.1

Download Download the package now.

All supported x64-based versions of Windows 8.1

Download Download the package now.

All supported x64-based versions of Windows Server 2012 R2

Download Download the package now.

Note The update for Windows RT 8.1 can be downloaded only from Windows Update.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Update detail information

Prerequisites

To apply this update, you must have April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows 8.1 or Windows Server 2012 R2.

Registry information

To apply this update, you don't have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update doesn't replace a previously released update.

Status

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

References

Learn about the terminology that Microsoft uses to describe software updates.

File Information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.

Notes

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.3.960 0.18 xxx

    Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2

    RTM

    GDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

Windows RT 8.1

File name

File version

File size

Date

Time

Platform

Rsaenh.dll

6.3.9600.18191

164,792

09-Jan-2016

01:57

Not applicable

x86 Windows 8.1

File name

File version

File size

Date

Time

Platform

Rsaenh.dll

6.3.9600.18191

192,120

09-Jan-2016

01:49

x86

x64 Windows 8.1 and Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Rsaenh.dll

6.3.9600.18191

218,448

09-Jan-2016

01:49

x64

Rsaenh.dll

6.3.9600.18191

192,120

09-Jan-2016

01:49

x86


Windows RT 8.1

File property

Value

File name

Arm_d6532b0043323643fa2080d0ae24b28d_31bf3856ad364e35_6.3.9600.18191_none_2a451f30c4f40bf4.manifest

File version

Not applicable

File size

698

Date (UTC)

09-Jan-2016

Time (UTC)

02:04

Platform

Not applicable

File name

Arm_microsoft-windows-rsaenh-dll_31bf3856ad364e35_6.3.9600.18191_none_f45b4480cce635b8.manifest

File version

Not applicable

File size

2,620

Date (UTC)

09-Jan-2016

Time (UTC)

02:05

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,574

Date (UTC)

09-Jan-2016

Time (UTC)

02:04

Platform

Not applicable

x86 Windows 8.1

File property

Value

File name

Update.mum

File version

Not applicable

File size

1,574

Date (UTC)

09-Jan-2016

Time (UTC)

02:05

Platform

Not applicable

File name

X86_d7967fa530008f9074fbfc89c0d87dd8_31bf3856ad364e35_6.3.9600.18191_none_0a66a2a2b6479f79.manifest

File version

Not applicable

File size

698

Date (UTC)

09-Jan-2016

Time (UTC)

02:05

Platform

Not applicable

File name

X86_microsoft-windows-rsaenh-dll_31bf3856ad364e35_6.3.9600.18191_none_f458d228cce916f2.manifest

File version

Not applicable

File size

2,620

Date (UTC)

09-Jan-2016

Time (UTC)

02:08

Platform

Not applicable

x64 Windows 8.1 and Windows Server 2012 R2

File property

Value

File name

Amd64_d7967fa530008f9074fbfc89c0d87dd8_31bf3856ad364e35_6.3.9600.18191_none_66853e266ea510af.manifest

File version

Not applicable

File size

700

Date (UTC)

09-Jan-2016

Time (UTC)

02:05

Platform

Not applicable

File name

Amd64_fb0620b63d748f32ff4ed35f1d4d4ff1_31bf3856ad364e35_6.3.9600.18191_none_b6bd94f4150e70bf.manifest

File version

Not applicable

File size

702

Date (UTC)

09-Jan-2016

Time (UTC)

02:05

Platform

Not applicable

File name

Amd64_microsoft-windows-rsaenh-dll_31bf3856ad364e35_6.3.9600.18191_none_50776dac85468828.manifest

File version

Not applicable

File size

2,624

Date (UTC)

09-Jan-2016

Time (UTC)

02:11

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,791

Date (UTC)

09-Jan-2016

Time (UTC)

02:05

Platform

Not applicable

File name

X86_microsoft-windows-rsaenh-dll_31bf3856ad364e35_6.3.9600.18191_none_f458d228cce916f2.manifest

File version

Not applicable

File size

2,620

Date (UTC)

09-Jan-2016

Time (UTC)

02:11

Platform

Not applicable


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