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VA Technical Reference Model v 26.1

GNU Privacy Guard for Windows (Gpg4win)

General Information

Technologies must be operated and maintained in accordance with Federal and Department security and privacy policies and guidelines. More information on the proper use of the TRM can be found on the TRM Proper Use Tab/Section.

Website:	Go to site
Description:	GNU Privacy Guard for Windows (Gpg4win) is encryption software for files and emails. This technology allows users to send and receive text in various languages and attachments. It also shows the state of encryption directly in the mail window and provides support for sending and receiving Hyper Text Markup Language (HTML) emails.
Technology/Standard Usage Requirements:	Users must ensure their use of this technology/standard is consistent with VA policies and standards, including, but not limited to, VA Handbooks 6102 and 6500; VA Directives 6004, 6513, and 6517; and National Institute of Standards and Technology (NIST) standards, including Federal Information Processing Standards (FIPS). Users must ensure sensitive data is properly protected in compliance with all VA regulations. Prior to use of this technology, users should check with their supervisor, Information System Security Officer (ISSO), Facility Chief Information Officer (CIO), or local Office of Information and Technology (OI&T) representative to ensure that all actions are consistent with current VA policies and procedures prior to implementation.
Section 508 Information:	This technology has not been assessed by the Section 508 Office. The Implementer of this technology has the responsibility to ensure the version deployed is 508-compliant. Section 508 compliance may be reviewed by the Section 508 Office and appropriate remedial action required if necessary. For additional information or assistance regarding Section 508, please contact the Section 508 Office at Section508@va.gov.
Decision:	View Decisions

Decision Source:	TRM Mgmt Group
Decision Process:	One-VA TRM v25.11
Decision Date:	11/22/2025 at 00:07:53 UTC
Introduced By:	TRM Request
Vendor Name:	Gpg4win.org
Cage Code:	N/A

Vendor Release Information

The Vendor Release table provides the known releases for the TRM Technology, obtained from the vendor (or from the release source).

You must be logged into the RSAA website prior to clicking the Attestation URLs or the URLs won't open.

Major versions and minor versions of that Major released on or after 09/14/2022 are NOT EXEMPT. Major Versions released before 09/14/2022 are EXEMPT as well as minor versions of that Major regardless of release date.

Version	Release Date	Vendor End of Life Date	Vendor Desupport Date
2.x	08/07/2009
3.x	09/09/2017
4.x	12/21/2021

Current Decision Matrix (11/13/2025)

Users must ensure their use of this technology/standard is consistent with VA policies and standards, including, but not limited to, VA Handbooks 6102 and 6500; VA Directives 6004, 6513, and 6517; and National Institute of Standards and Technology (NIST) standards, including Federal Information Processing Standards (FIPS). Users must ensure sensitive data is properly protected in compliance with all VA regulations. Prior to use of this technology, users should check with their supervisor, Information System Security Officer (ISSO), Facility Chief Information Officer (CIO), or local Office of Information and Technology (OI&T) representative to ensure that all actions are consistent with current VA policies and procedures prior to implementation.

The VA Decision Matrix displays the current and future VAIT position regarding different releases of a TRM entry. These decisions are based upon the best information available as of the most current date. The consumer of this information has the responsibility to consult the organizations responsible for the desktop, testing, and/or production environments to ensure that the target version of the technology will be supported.

Legend:

White	Authorized: The technology/standard has been authorized for use.
Yellow	Authorized w/ Constraints: The technology/standard can be used within the specified constraints located below the decision matrix in the footnote[1] and on the General tab.
Gray	Unauthorized, Conditions Required^[a] : This technology or standard can be used only if a POA&M review is conducted and signed by the Authorizing Official Designated Representative (AODR) as designated by the Authorizing Official (AO) or designee and based upon a recommendation from the POA&M Compliance Enforcement, has been granted to the project team or organization that wishes to use the technology.
Orange	Unauthorized, Conditions Required^[b] : VA has decided to divest itself on the use of the technology/standard. As a result, all projects currently utilizing the technology/standard must plan to eliminate their use of the technology/standard. Additional information on when the entry is projected to become unauthorized may be found on the Decision tab for the specific entry.
Black	Unauthorized: The technology/standard is not (currently) permitted to be used under any circumstances.
Blue	Unauthorized, Conditions Required^[c] : The period of time this technology is currently being evaluated, reviewed, and tested in controlled environments. Use of this technology is strictly controlled and not available for use within the general population. If a customer would like to use this technology, please work with your local or Regional OI&T office and contact the appropriate evaluation office displayed in the notes below the decision matrix. The Local or Regional OI&T office should submit an inquiry to the TRM if they require further assistance or if the evaluating office is not listed in the notes below.

Release/Version Information:

VA decisions for specific versions may include a ‘.x’ wildcard, which denotes a decision that pertains to a range of multiple versions.

For example, a technology authorized with a decision for 7.x would cover any version of 7.(Anything) - 7.(Anything). However, a 7.4.x decision would cover any version of 7.4.(Anything), but would not cover any version of 7.5.x or 7.6.x on the TRM.

VA decisions for specific versions may include ‘+’ symbols; which denotes that the decision for the version specified also includes versions greater than what is specified but is not to exceed or affect previous decimal places.

For example, a technology authorized with a decision for 12.6.4+ would cover any version that is greater than 12.6.4, but would not exceed the .6 decimal ie: 12.6.401 is ok, 12.6.5 is ok, 12.6.9 is ok, however 12.7.0 or 13.0 is not.

Any major.minor version that is not listed in the VA Decision Matrix is considered Unauthorized, Conditions Required ^[a] .

<Past

CY2024

CY2025

CY2026

Future>

Release

2.x

Unapproved

Authorized w/ Constraints (POA&M)

Unauthorized, Conditions Required^[a]

3.x

Unapproved

Authorized w/ Constraints (POA&M)

Unauthorized, Conditions Required^[a]

4.x

Approved w/Constraints
[6, 7, 8, 9]

Authorized w/ Constraints
[6, 7, 8, 9]

Note:

At the time of writing, version 4.4.1 is the most current version, released 05/21/2025.

Decision Constraints


[6]	Users should check with their supervisor, Information System Security Officer (ISSO) or local OIT representative for permission to download and use this software. Downloaded software must always be scanned for viruses prior to installation to prevent adware or malware. Freeware may only be downloaded directly from the primary site that the creator of the software has advertised for public download and user or development community engagement. Users should note, any attempt by the installation process to install any additional, unrelated software is not authorized and the user should take the proper steps to decline those installations.

[7]	Due to National Institute of Standards and Technology (NIST) identified security vulnerabilities, extra vigilance should be applied to ensure the versions remain properly patched to mitigate known and future vulnerabilities. The local ISSO (Information System Security Officer) can provide assistance in reviewing the NIST vulnerabilities.

[8]	Veterans Affairs (VA) users must ensure VA sensitive data is properly protected in compliance with all VA regulations. All instances of deployment using this technology should be reviewed by the local ISSO (Information System Security Officer) to ensure compliance with both VA Handbook 6500 and VA Directive 6500.

[9]	The Federal Information Processing standards (FIPS) 140-2 certification status of this technology was not able to be verified. This technology will require a 3rd party FIPS 140-2 or 140-3 certified solution for any data containing PHI/PII or VA sensitive information, where applicable. More information regarding the Cryptographic Module Validation Program (CMVP) can be found on the NIST website.

Type	Name	Source	Description
*NOTE: Vendor provided information is subject to the accuracy of the manufacturer.

Technology Components

Note: This list may not be complete. No component, listed or unlisted, may be used outside of the technology in which it is released. The usage decision for a component is found in the Decision and Decision Constraints.

Name	Description
Gnu Privacy Assistant (GPA)	GPA is a graphical user interface for the GnuPG (GNU Privacy Guard).
GNU Privacy Guard (GnuPG)	GNU Privacy Guard (GnuPG) is the backend; this is the actual encryption tool.
GpgEX	This is the Windows Explorer Shell Extension.
GpgOL	GpgOL is a plugin for use in Microsoft Outlook.
Kleopatra	Kleopatra is the certificate manager in Gpg4win.


Security Data Security	Data Loss Prevention
Security Network Security	Encryption

General Analysis

Adoption Benefits

This technology is available at no cost through open source licensing and supports VA`s open source initiative.
This technology may improve productivity for specific staff whose responsibilities include encrypting signed data.
This is a well-documented technology.
There are minimal other TRM-authorized technologies that provide the same functionality.
This technology uses a Public Key Infrastructure (PKI)-based method to encrypt messages.
The use of this technology may help improve the security posture of the organization.
This technology supports several industry standard file formats.

Adoption Risks

Due to the rapid release schedule of this technology, the VA may be unable to update to the most recent patch and may require a deployment model requiring the use of specific versions.
There are known Common Vulnerabilities and Exposures (CVEs) associated with this technology. Please see https://nvd.nist.gov/vuln/search for more details.
There is no indication based on either the vendor documentation or the Cryptographic Module Validation Program (CMVP) that this technology is Federal Information Processing Standard (FIPS) 140-2 compliant.
As open-source software, this product may be left without clearly defined support options which may result in suboptimal enterprise level support.
The potential exists to store Personally Identifiable Information (PII), Protected Health Information (PHI) and/or VA Sensitive data and proper security standards must be followed in these cases.

Architectural Benefits

This technology is compatible with multiple other Technical Reference Model (TRM) technologies and standards used by the organization.

Architectural Risks

This technology is not portable as it runs only on Windows platforms.

- The information contained on this page is accurate as of the Decision Date (11/22/2025 at 00:07:53 UTC).

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VA Technical Reference Model v 26.1

General Information

Vendor Release Information

Current Decision Matrix (11/13/2025)

Decision Constraints

References

Technology Components

VA Categories

View the VA Categorization Framework

Open Source

Operating Systems Supported by the Technology

Technologies/Standards Relationships

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General Analysis

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Architectural Risks

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VA Technical Reference Model v 26.1

General Information

Vendor Release Information

Current Decision Matrix (11/13/2025)

Decision Constraints

References

Technology Components

VA Categories View the VA Categorization Framework

Open Source

Operating Systems Supported by the Technology

Technologies/Standards Relationships

Runtime Dependencies:

Optional Dependencies:

Comparable Technologies:

Companion Technologies/Supported Standards:

General Analysis

Adoption Benefits

Adoption Risks

Architectural Benefits

Architectural Risks

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VA Categories

View the VA Categorization Framework