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CA/Browser Forum Releases Code Signing Baseline Requirements Public Comment Draft

In 2013, the CA/Browser Forum voted to create a Code Signing Working Group whose sole purpose was to come up with a set of Baseline Requirements for the issuance of Code Signing Certificates. The result of that effort is the:

Baseline Requirements for Code Signing Certificates, Public Comment Draft (doc)

Baseline Requirements for Code Signing Certificates, Public Comment Draft (pdf)

Once approved by the CA/B Forum and subsequent audit standards are created, all Certificate Authorities will be obligated to follow these Requirements when issuing and managing code signing certificates.

The goals of this project and resulting document are as follows:

  1. Create uniform identification and vetting procedures that all Certificate Authorities must follow when issuing code signing certificates
  2. Identify ways to stop the theft of private keys and prevent key compromise by increasing the required levels of key protection
  3. Identify origins of malware (geographic and otherwise) and implement procedures to reduce the incidence of signed malware
  4. Document standards for code signing “services” which store private code-signing keys in cloud-based service offerings

Although it may seem that the biggest beneficiaries of these guidelines will be large operating system vendors that utilize code signing certificates, the public as a whole will benefit from a reduced incidence of malware on their systems and devices. We urge users, the software development industry, and operating system platforms to carefully review this document and provide comments to the CA/B Forum by October 30, 2014. The Working Group will review every comment for incorporation into the final draft. Comments should be sent to . Thanks, The Code Signing Working Group

Latest releases
Server Certificate Requirements
SC095v3: Clean-up 2025 - Apr 2, 2026

Code Signing Requirements
v3.8 - Aug 5, 2024

What’s Changed CSC-25: Import EV Guidelines to CS Baseline Requirements by @dzacharo in https://github.com/cabforum/code-signing/pull/38 Full Changelog: https://github.com/cabforum/code-signing/compare/v3.7...v3.8

S/MIME Requirements
v1.0.13 - Ballot SMC015v2 - Mar 28, 2026

This ballot introduces requirements that a CA or RA must follow to rely upon a Mobile Drivers License (mDL) to provide evidence for the authentication of individual identity. It allows the use of mDL that conform to ISO/IEC 18013-5 and which may be verified by the CA or RA in conformance with ISO/IEC 18013-7. The CA or RA shall only accept mDL from an Issuing Authority that is legally authorized by the relevant government or jurisdiction to issue driving licenses. The draft also aligns the subsections of 3.2.4.2 (Validation of individual identity) to correspond more closely with those in 3.2.4.1 (Attribute collection of individual identity). It also includes minor editorial corrections. SMC015v2 was updated to remove an additional reference to the superceded ETSI EN 319 403. This ballot is proposed by Stephen Davidson (DigiCert) and endorsed by Ben Wilson (Mozilla) and Scott Rea (eMudhra).

Network and Certificate System Security Requirements
Version 2.0.5 (Ballot NS-008) - Jul 9, 2025

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The Certification Authority Browser Forum (CA/Browser Forum) is a voluntary gathering of Certificate Issuers and suppliers of Internet browser software and other applications that use certificates (Certificate Consumers).