Yes. This would work great! Can I suggest the following string for the module:

id-mod-plm-2025 (TBD0)

That would make the registrations:

id-mod-plm-2025 (86) in 
https://www.iana.org/assignments/smi-numbers/smi-numbers.xhtml#security-smime-0

and

id-ct-prefixlenCSVwithCRLF (57) in 
https://www.iana.org/assignments/smi-numbers/smi-numbers.xhtml#security-smime-1

spt

> On Dec 3, 2025, at 13:19, David Dong via RT 
> <[email protected]> wrote:
> 
> Hi Sean,
> 
> Would this proposed update from Russ be OK if they were to implement it? This 
> is still on the telechat agenda for tomorrow, if you would be able to let us 
> know today.
> 
> Thank you!
> 
> Best regards,
> 
> David Dong
> IANA Services Sr. Specialist
> 
> On Wed Dec 03 17:41:54 2025, [email protected] wrote:
>> I suggest an Appendix with this ASN.1 Module:
>> 
>> ~~~
>>   PrefixLengthsModule-2025
>>     { iso(1) member-body(2) us(840) rsadsi(113549)
>>       pkcs(1) pkcs9(9) smime(16) mod(0) TBD0 }
>> 
>> DEFINITIONS IMPLICIT TAGS ::=
>> BEGIN
>> 
>> -- EXPORTS ALL --
>> 
>> IMPORTS
>>  CONTENT-TYPE
>>  FROM CryptographicMessageSyntax-2010 -- in [RFC6268]
>>  { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1)
>>    pkcs-9(9) smime(16) modules(0) id-mod-cms-2009(58) } ;
>> 
>> ContentSet CONTENT-TYPE ::= { ct-prefixlenCSVwithCRLF, ... }
>> 
>> ct-prefixlenCSVwithCRLF CONTENT-TYPE ::=
>>  { TYPE OCTET STRING IDENTIFIED BY id-ct-prefixlenCSVwithCRLF }
>> 
>> id-ct-prefixlenCSVwithCRLF OBJECT IDENTIFIER ::=
>>  { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1)
>>    pkcs-9(9) smime(16) ct(1) TBD1 }
>> 
>> END
>> ~~~
>> 
>> We will also need IANA to assign an OID for the module.  This is a
>> minor update to the IANA considerations section.
>> 
>> Russ
>> 
>>> On Dec 2, 2025, at 5:09 PM, David Dong via RT <drafts-expert-review-
>>> [email protected]> wrote:
>>> 
>>> Dear Authors/Chairs/ADs,
>>> 
>>> Please see below for feedback for the SMI Security for S/MIME CMS
>>> Content Type registration from the expert.
>>> 
>>> Best regards,
>>> 
>>> David Dong
>>> IANA Services Sr. Specialist
>>> 
>>> On Tue Dec 02 20:45:44 2025, [email protected] wrote:
>>>> Did a quick look at this and have a questions about why there’s no
>>>> ASN.1 module that formally defines the content type? The knock on
>>>> effects for adding a module that come to mind would be:
>>>> - another section for the ASN.1 module
>>>> - another IANA request for SMIME ASN.1 Module Arc
>>>> - normative refs to X.680, X.690, & RFC 5911 (imports CONTENT-TYPE)
>>>> 
>>>> Cheers,
>>>> spt
>>>> 
>>>>> On Dec 1, 2025, at 18:50, David Dong via RT <drafts-expert-review-
>>>>> [email protected]> wrote:
>>>>> 
>>>>> Dear Sean Turner (cc: opsawg WG),
>>>>> 
>>>>> As the backup designated expert for the SMI Security for S/MIME CMS
>>>>> Content Type registry, can you review the proposed registration in
>>>>> draft-ietf-opsawg-prefix-lengths-08 for us? Would you be able to
>>>>> review this before the IESG telechat this week?
>>>>> 
>>>>> Please note that Russ is a co-author on this document.
>>>>> 
>>>>> Please see:
>>>>> 
>>>>> https://datatracker.ietf.org/doc/draft-ietf-opsawg-prefix-lengths/
>>>>> 
>>>>> If this is OK, when the IESG approves the document for publication,
>>>>> we'll make the registration at:
>>>>> 
>>>>> https://www.iana.org/assignments/smi-numbers/
>>>>> 
>>>>> With thanks,
>>>>> 
>>>>> David Dong
>>>>> IANA Services Sr. Specialist
>>>>> 
>>>>> On Thu Nov 13 23:10:41 2025, david.dong wrote:
>>>>>> Dear Sean Turner (cc: opsawg WG),
>>>>>> 
>>>>>> As the backup designated expert for the SMI Security for S/MIME
>>>>>> CMS
>>>>>> Content Type registry, can you review the proposed registration in
>>>>>> draft-ietf-opsawg-prefix-lengths-08 for us? Please note that Russ
>>>>>> is
>>>>>> a
>>>>>> co-author on this document.
>>>>>> 
>>>>>> Please see:
>>>>>> 
>>>>>> https://datatracker.ietf.org/doc/draft-ietf-opsawg-prefix-lengths/
>>>>>> 
>>>>>> The due date is November 27th.
>>>>>> 
>>>>>> If this is OK, when the IESG approves the document for
>>>>>> publication,
>>>>>> we'll make the registration at:
>>>>>> 
>>>>>> https://www.iana.org/assignments/smi-numbers/
>>>>>> 
>>>>>> With thanks,
>>>>>> 
>>>>>> David Dong
>>>>>> IANA Services Sr. Specialist
>>>>> 
>>> 
> 

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