[Discussion] Ballot SMC017v2: Increase Minimum RSA CA Key Size

[Stephen Davidson]

Ballot SMC017v2: Increase Minimum RSA CA Key Size

Summary: 

This ballot increases the minimum RSA key size for Root and Subordinate CA certificates in the S/MIME BRs from 2048 to 4096 bits for keys created after September 15, 2026, while retaining the 2048-bit minimum for Subscriber certificates.

The ballot further requires that by September 15, 2027, CAs SHALL NOT issue Subscriber certificates from any Sub-CA whose RSA key modulus is less than 3072 bits, effectively sunsetting issuance from legacy 2048-bit Sub-CAs.

The ballot also includes minor typographic corrections.

This ballot is proposed by Martijn Katerbarg (Sectigo) and endorsed by Ben Wilson (Mozilla) and Stephen Davidson (DigiCert)

— Motion Begins —

This ballot modifies the “Baseline Requirements for the Issuance and Management of Publicly-Trusted S/MIME Certificates” (“S/MIME Baseline Requirements”), based on Version 1.0.14.

MODIFY the Baseline Requirements as specified in the following Redline:

https://github.com/cabforum/smime/compare/3948f7f538133f6e9d731660f0fc36bfc8d98c13...ff477d9adb959f6b9c4318784267ed82232fedac

— Motion Ends —

This ballot proposes a Final Maintenance Guideline. The procedure for approval of this ballot is as follows:

Discussion (at least 7 days)

• Start time: June 16, 2026 at 18:00:00 UTC
• End time: June 23, 2026 at 18:00:00 UTC

[Stephen Davidson]

·         Start time: June 16, 2026 at 18:00:00 UTC

·         End time: June 23, 2026 at 18:00:00 UTC

Voting for Approval

·         Start time: June 23, 2026 at 18:00:00 UTC

·         End time: June 30, 2026 at 18:00:00 UTC

 

[Stefan Selbitschka]

rundQuadrat votes "yes" on SMC017v2

On 6/23/26 19:00, 'Stephen Davidson' via S/MIME Certificate WG - Public (CA/B Forum) wrote:
> *Ballot SMC017v2: Increase Minimum RSA CA Key Size*

>
> Summary:
>
> This ballot increases the minimum RSA key size for Root and Subordinate CA certificates in the S/
> MIME BRs from 2048 to 4096 bits for keys created after September 15, 2026, while retaining the 2048-
> bit minimum for Subscriber certificates.
>
> The ballot further requires that by September 15, 2027, CAs SHALL NOT issue Subscriber certificates
> from any Sub-CA whose RSA key modulus is less than 3072 bits, effectively sunsetting issuance from
> legacy 2048-bit Sub-CAs.
>
> The ballot also includes minor typographic corrections.
>
> This ballot is proposed by Martijn Katerbarg (Sectigo) and endorsed by Ben Wilson (Mozilla) and
> Stephen Davidson (DigiCert)
>
> — Motion Begins —
>
> This ballot modifies the “Baseline Requirements for the Issuance and Management of Publicly-Trusted
> S/MIME Certificates” (“S/MIME Baseline Requirements”), based on Version 1.0.14.
>
> MODIFY the Baseline Requirements as specified in the following Redline:
>
> https://github.com/cabforum/smime/
> compare/3948f7f538133f6e9d731660f0fc36bfc8d98c13...ff477d9adb959f6b9c4318784267ed82232fedac

> <https://url.avanan.click/v2/r01/___https:/github.com/cabforum/smime/
> compare/3948f7f538133f6e9d731660f0fc36bfc8d98c13...ff477d9adb959f6b9c4318784267ed82232fedac___.YXAzOmRpZ2ljZXJ0OmE6bzowMGFjNjE1ZDljZTk0NmE0Yjc0OTFiMTBmZGViMjgzYjo3OmRlN2M6YTkyNTVjZWEzZDBiZWNjZjUwNTYwNTNkMWExMTBhMTM4M2MzNTE4ODg0Zjc4NzI2YzI4ZmFhZDk0OTMyMWZhYzpoOlQ6Rg>

>
> — Motion Ends —
>
> This ballot proposes a Final Maintenance Guideline. The procedure for approval of this ballot is as
> follows:
>

> *Discussion *
>
> ·Start time: June 16, 2026 at 18:00:00 UTC

>
> ·End time: June 23, 2026 at 18:00:00 UTC
>

> *Voting for Approval *
>
> ·Start time: June 23, 2026 at 18:00:00 UTC

>
> ·End time: June 30, 2026 at 18:00:00 UTC
>

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[Adriano Santoni]

Actalis votes "yes" on SMC017v2.

Il 23/06/2026 19:00, 'Stephen Davidson' via S/MIME Certificate WG - Public (CA/B Forum) ha scritto:

External sender. Verify for authenticity before opening any links or attachments.

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[Michael Guenther]

[黃晟(orca)]

TWCA votes Yes on Ballot SMC017v2.

 

 

Best,

 

Sean Huang

Senior PKI Compliance Engineer
TEL：02-2370-8886#728
FAX：02-2388-6720
Email：or...@twca.com.tw

10F., No. 85, Yanping South Road,

Taipei, Taiwan (R.O.C.)

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[Ben Wilson]

Mozilla votes "yes" on Ballot SMC-017v2.

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[Dustin Hollenback]

Apple votes “yes" on Ballot SMC-017v2.

[Tim Hollebeek]

DigiCert votes “yes" on Ballot SMC-017v2.

-Tim

To view this discussion visit https://groups.google.com/a/groups.cabforum.org/d/msgid/smcwg-public/7A9AD2A5-898C-4360-A5BA-F559D549A0AC%40apple.com.

[Ashish Dhiman]

GlobalSign votes Yes to SMC017v2

Get Outlook for Android

---

From: 'Stephen Davidson' via S/MIME Certificate WG - Public (CA/B Forum) <smcwg-...@groups.cabforum.org>
Sent: Tuesday, June 23, 2026 10:31:08 pm
To: smcwg-...@groups.cabforum.org <smcwg-...@groups.cabforum.org>
Subject: [Smcwg-public] [Voting for Approval] Ballot SMC017v2: Increase Minimum RSA CA Key Size

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[Nome Huang]

TrustAsia votes “Yes” on ballot SMC017v2.

[Ruiter, Albert de]

Logius votes “Yes” on ballot SMC017v2.

 

Kind regards,

Albert de Ruiter

Policy Authority PKIoverheid

 

Logius

 

Dienst Digitale Samenleving

Ministerie van Binnenlandse Zaken en Koninkrijksrelaties

........................................................................

M 06-22796535

Albert...@logius.nl

www.logius.nl

 

........................................................................

Logius is continu op zoek naar nieuwe collega’s. Bekijk alle vacatures op onze website.

Samen zorgen we voor een digitale overheid die werkt voor iedereen

--

[Scott Rea]

eMudhra Votes Yes to Ballot SMC017v2

From: 'Stephen Davidson' via S/MIME Certificate WG - Public (CA/B Forum) <smcwg-...@groups.cabforum.org>
Date: Tuesday, 23 June 2026 at 11:01 AM
To: smcwg-...@groups.cabforum.org <smcwg-...@groups.cabforum.org>

Subject: [Smcwg-public] [Voting for Approval] Ballot SMC017v2: Increase Minimum RSA CA Key Size

CAUTION: This email is originated from outside of the organization. Do not open the links or the attachments unless you recognize the sender and know the content is safe.

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[Inigo Barreira]

Sectigo votes yes

 

De: 'Stephen Davidson' via S/MIME Certificate WG - Public (CA/B Forum) <smcwg-...@groups.cabforum.org>
Enviado el: martes, 23 de junio de 2026 19:01
Para: smcwg-...@groups.cabforum.org
Asunto: [Smcwg-public] [Voting for Approval] Ballot SMC017v2: Increase Minimum RSA CA Key Size

 

Ballot SMC017v2: Increase Minimum RSA CA Key Size Summary: This ballot increases the minimum RSA key size for Root and Subordinate CA certificates in the S/MIME BRs from 2048 to 4096 bits for keys created after September 15, 2026, while retaining

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[Andrea Holland]

IdenTrust votes Yes to SMC-017v2

 

Sincerely,

Andrea Holland

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[大野 文彰]

SECOM Trust Systems votes YES on Ballot SMC017v2.

 

Best regards,

 

ONO Fumiaki / 大野 文彰

(Japanese name order: family name first, in uppercase)

SECOM Trust Systems CO., LTD.

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[Dimitris Zacharopoulos (HARICA)]

HARICA votes "yes" to ballot SMC017v2.

--

[Pedro FUENTES]

OISTE Votes Yes to SMC017v2

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Pedro Fuentes
CSO - Trust Services Manager
Office: + 41 (0) 22 594 30 00
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[Entschew, Enrico]

D-Trust votes „YES“ on Ballot SMC017v2.

 

Thanks,

Enrico

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[Rebecca Kelley]

SSL.com votes "YES" on Ballot SMC017v2.

- Rebecca Kelley

[Karina Sirota Goodley]

Microsoft votes Yes on SMC017v2

[Kateryna Aleksieieva]

Certum votes YES on Ballot SMC017v2

 

Kind regards,

Kateryna Aleksieieva

From: 'Stephen Davidson' via S/MIME Certificate WG - Public (CA/B Forum) <smcwg-...@groups.cabforum.org>

Sent: Tuesday, June 23, 2026 7:01 PM
To: smcwg-...@groups.cabforum.org

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[Azira Zakaria]

MSC Trustgate votes YES on Ballot SMC017v2

 

 

Best regards,

Azira

 

From: 'Stephen Davidson' via S/MIME Certificate WG - Public (CA/B Forum) <smcwg-...@groups.cabforum.org>

Sent: Wednesday, 24 June, 2026 1:01 AM
To: smcwg-...@groups.cabforum.org

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[Lahtiharju, Pekka]

Telia Company votes YES on Ballot SMC017v2

 

Best regards,

Pekka Lahtiharju

 

 

From: 'Stephen Davidson' via S/MIME Certificate WG - Public (CA/B Forum) <smcwg-...@groups.cabforum.org>

Sent: Tuesday, June 23, 2026 8:01 PM
To: smcwg-...@groups.cabforum.org

Subject: [Smcwg-public] [Voting for Approval] Ballot SMC017v2: Increase Minimum RSA CA Key Size

 

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