Files are corrupted after you encrypt them with ECC certificates by using the EFS feature in Windows 7 or in Windows Server 2008 R2

Symptoms

Issue 1

Consider the following scenario:

  • You encrypt the Favorites folder (%userprofile%/Favorites) with an Elliptic curve cryptography (ECC) certificate by using the Encrypting Files System (EFS) feature on a computer that is running Windows 7 or Windows Server 2008 R2.

  • You add a webpage that has a shortcut icon (favicon.ico) to the Favorites folder.

  • You restart the computer.

In this scenario, some characters in the webpage file of the webpage that you added are displayed incorrectly. Additionally, you cannot access the webpage through the file in the Favorites folder.

Issue 2

Consider the following scenario:

  • You encrypt two files with ECC certificates by using the EFS feature on a computer that is running Windows 7 or Windows Server 2008 R2.

  • You copy one of the files, and then you paste the file that you copied to overwrite the other file.

  • You restart the computer.

In this scenario, the file that you overwrote is corrupted.

Notes

  • ECC is a public key encryption technique that you can use to create faster, smaller, and more efficient cryptographic keys.

  • These issues occur only when you use the EFS feature to encrypt files of folders with ECC certificates.

  • These issues do not occur when you use the EFS feature to encrypt files or folders with RSA certificates.


Cause

The EFS encryption feature encrypts file data in chunks of 512 bytes, and each chunk has a 16-byte initialization vector (IV). The Advanced Encryption Standard (AES) cipher algorithm in the Cipher Block Chaining (CBC) mode is used for encryption. These issues occur because the first 16 bytes of every 512-byte chunk are corrupted during encryption.

Resolution

Hotfix information

How to obtain this hotfix

This hotfix is available from the Microsoft Update website:

http://update.microsoft.comThe following files are available for download from the Microsoft Download Center:

Operating system

Update

All supported x86-based versions of Windows 7

Download Download the update package now.

All supported x64-based versions of Windows 7

Download Download the update package now.

All supported x64-based versions of Windows Server 2008 R2

Download Download the update package now.

All supported IA-64-based versions of Windows Server 2008 R2

Download Download the update package now.


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.

Prerequisites

To apply this hotfix, you must be running one of the following operating systems:

  • Windows 7

  • Windows 7 Service Pack 1 (SP1)

  • Windows Server 2008 R2

  • Windows Server 2008 R2 Service Pack 1 (SP1)

For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To apply this hotfix, 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.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 7 and Windows Server 2008 R2 file information notes


Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • 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

    6.1.760
    0.21xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    LDR

    6.1.760
    1.17xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    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 separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Ntfs.sys

6.1.7600.17119

1,210,736

31-Aug-2012

17:21

x86

Ntfs.sys

6.1.7600.21316

1,210,736

31-Aug-2012

17:20

x86

Ntfs.sys

6.1.7601.17945

1,211,760

31-Aug-2012

17:18

x86

Ntfs.sys

6.1.7601.22104

1,212,272

31-Aug-2012

17:01

x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Ntfs.sys

6.1.7600.17119

1,656,688

31-Aug-2012

18:02

x64

Ntfs.sys

6.1.7600.21316

1,680,240

31-Aug-2012

18:19

x64

Ntfs.sys

6.1.7601.17945

1,659,760

31-Aug-2012

18:19

x64

Ntfs.sys

6.1.7601.22104

1,687,408

31-Aug-2012

17:57

x64

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Ntfs.sys

6.1.7600.17119

3,553,648

31-Aug-2012

17:02

IA-64

Ntfs.sys

6.1.7600.21316

3,553,648

31-Aug-2012

17:09

IA-64

Ntfs.sys

6.1.7601.17945

3,556,208

31-Aug-2012

16:54

IA-64

Ntfs.sys

6.1.7601.22104

3,557,232

31-Aug-2012

16:46

IA-64

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

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7

File name

X86_17f4b32e327330a2fd2ea33d07dbefec_31bf3856ad364e35_6.1.7600.21316_none_397959f6c0050407.manifest

File version

Not applicable

File size

692

Date (UTC)

02-Sep-2012

Time (UTC)

08:13

Platform

Not applicable

File name

X86_3224d4367283c12e1df948df721ba0e7_31bf3856ad364e35_6.1.7600.17119_none_6d1d4b39a07876ae.manifest

File version

Not applicable

File size

692

Date (UTC)

02-Sep-2012

Time (UTC)

08:13

Platform

Not applicable

File name

X86_e3073b3081ed777af47bf209f7550ea4_31bf3856ad364e35_6.1.7601.22104_none_4814395731906c71.manifest

File version

Not applicable

File size

692

Date (UTC)

02-Sep-2012

Time (UTC)

08:13

Platform

Not applicable

File name

X86_e468c7e9bdf07a234cff8bca053d9561_31bf3856ad364e35_6.1.7601.17945_none_54310e4c44ec2354.manifest

File version

Not applicable

File size

692

Date (UTC)

02-Sep-2012

Time (UTC)

08:13

Platform

Not applicable

File name

X86_microsoft-windows-ntfs_31bf3856ad364e35_6.1.7600.17119_none_a69715e87e02f01c.manifest

File version

Not applicable

File size

14,508

Date (UTC)

31-Aug-2012

Time (UTC)

17:38

Platform

Not applicable

File name

X86_microsoft-windows-ntfs_31bf3856ad364e35_6.1.7600.21316_none_a71db3bb97234108.manifest

File version

Not applicable

File size

14,508

Date (UTC)

31-Aug-2012

Time (UTC)

17:36

Platform

Not applicable

File name

X86_microsoft-windows-ntfs_31bf3856ad364e35_6.1.7601.17945_none_a8592bc67b451464.manifest

File version

Not applicable

File size

14,508

Date (UTC)

31-Aug-2012

Time (UTC)

18:56

Platform

Not applicable

File name

X86_microsoft-windows-ntfs_31bf3856ad364e35_6.1.7601.22104_none_a90ce01994435e55.manifest

File version

Not applicable

File size

14,508

Date (UTC)

31-Aug-2012

Time (UTC)

17:23

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_044f76ed3d5c810a899826463f9c84e8_31bf3856ad364e35_6.1.7600.21316_none_f92a8d43de62fa91.manifest

File version

Not applicable

File size

696

Date (UTC)

02-Sep-2012

Time (UTC)

08:13

Platform

Not applicable

File name

Amd64_7fc780bf6a7dd7a2fce0384108b295b5_31bf3856ad364e35_6.1.7601.17945_none_56cdf7fd7eeb0060.manifest

File version

Not applicable

File size

696

Date (UTC)

02-Sep-2012

Time (UTC)

08:13

Platform

Not applicable

File name

Amd64_8582a74e88483421d7f591f0f3ea5a06_31bf3856ad364e35_6.1.7600.17119_none_6efbfc795beb1c27.manifest

File version

Not applicable

File size

696

Date (UTC)

02-Sep-2012

Time (UTC)

08:13

Platform

Not applicable

File name

Amd64_e304853851ed4ac79ce5221e486990c1_31bf3856ad364e35_6.1.7601.22104_none_08b017440c5ca821.manifest

File version

Not applicable

File size

696

Date (UTC)

02-Sep-2012

Time (UTC)

08:13

Platform

Not applicable

File name

Amd64_microsoft-windows-ntfs_31bf3856ad364e35_6.1.7600.17119_none_02b5b16c36606152.manifest

File version

Not applicable

File size

14,514

Date (UTC)

31-Aug-2012

Time (UTC)

18:38

Platform

Not applicable

File name

Amd64_microsoft-windows-ntfs_31bf3856ad364e35_6.1.7600.21316_none_033c4f3f4f80b23e.manifest

File version

Not applicable

File size

14,514

Date (UTC)

31-Aug-2012

Time (UTC)

18:43

Platform

Not applicable

File name

Amd64_microsoft-windows-ntfs_31bf3856ad364e35_6.1.7601.17945_none_0477c74a33a2859a.manifest

File version

Not applicable

File size

14,514

Date (UTC)

31-Aug-2012

Time (UTC)

18:42

Platform

Not applicable

File name

Amd64_microsoft-windows-ntfs_31bf3856ad364e35_6.1.7601.22104_none_052b7b9d4ca0cf8b.manifest

File version

Not applicable

File size

14,514

Date (UTC)

31-Aug-2012

Time (UTC)

18:21

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_23c0310ba068846ed9616a8a9a185732_31bf3856ad364e35_6.1.7601.17945_none_2f225afab6589b42.manifest

File version

Not applicable

File size

694

Date (UTC)

02-Sep-2012

Time (UTC)

08:13

Platform

Not applicable

File name

Ia64_2a0afb03db9b0f87c61e0862bd14fb2d_31bf3856ad364e35_6.1.7600.21316_none_603be0ac0364d82f.manifest

File version

Not applicable

File size

694

Date (UTC)

02-Sep-2012

Time (UTC)

08:13

Platform

Not applicable

File name

Ia64_2bd5c500da68d61c8634f2b449ded802_31bf3856ad364e35_6.1.7601.22104_none_0fee982f603085d6.manifest

File version

Not applicable

File size

694

Date (UTC)

02-Sep-2012

Time (UTC)

08:13

Platform

Not applicable

File name

Ia64_999be73f05927d9174338976f9c75948_31bf3856ad364e35_6.1.7600.17119_none_a23b3e42345bfa67.manifest

File version

Not applicable

File size

694

Date (UTC)

02-Sep-2012

Time (UTC)

08:13

Platform

Not applicable

File name

Ia64_microsoft-windows-ntfs_31bf3856ad364e35_6.1.7600.17119_none_a698b9de7e00f918.manifest

File version

Not applicable

File size

14,511

Date (UTC)

31-Aug-2012

Time (UTC)

18:36

Platform

Not applicable

File name

Ia64_microsoft-windows-ntfs_31bf3856ad364e35_6.1.7600.21316_none_a71f57b197214a04.manifest

File version

Not applicable

File size

14,511

Date (UTC)

31-Aug-2012

Time (UTC)

18:36

Platform

Not applicable

File name

Ia64_microsoft-windows-ntfs_31bf3856ad364e35_6.1.7601.17945_none_a85acfbc7b431d60.manifest

File version

Not applicable

File size

14,511

Date (UTC)

31-Aug-2012

Time (UTC)

18:27

Platform

Not applicable

File name

Ia64_microsoft-windows-ntfs_31bf3856ad364e35_6.1.7601.22104_none_a90e840f94416751.manifest

File version

Not applicable

File size

14,511

Date (UTC)

31-Aug-2012

Time (UTC)

18:12

Platform

Not applicable

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