Re: [Ace] draft-ietf-ace-cmpv2-coap-transport-00.txt - do not mention V" of CMP in the document

"Brockhaus, Hendrik" <hendrik.brockhaus@siemens.com> Fri, 12 March 2021 10:07 UTC

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From: "Brockhaus, Hendrik" <hendrik.brockhaus@siemens.com>
To: "david.von.oheimb@siemens.com" <david.von.oheimb@siemens.com>, Mohit Sahni <mohit06jan@gmail.com>
CC: "ace@ietf.org" <ace@ietf.org>, "Kretschmer, Andreas" <andreas.kretschmer@siemens.com>
Thread-Topic: draft-ietf-ace-cmpv2-coap-transport-00.txt - do not mention V" of CMP in the document
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Date: Fri, 12 Mar 2021 10:07:47 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ace/MFvrBuciUKdqFhRDvxGP1gJtvo8>
Subject: Re: [Ace] draft-ietf-ace-cmpv2-coap-transport-00.txt - do not mention V" of CMP in the document
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David, Mohit

> Von: David von Oheimb <David.von.Oheimb@siemens.com> 
> Gesendet: Donnerstag, 11. März 2021 18:51
>
> To reduce the DoS risk in particular with the need to split larger messages into smaller chunks to re-assemble them later,
> it should be pretty helpful if both sides of the connection minimize the number and contents of CMP message fields as far as possible,
> for instance by leaving out unimportant optional fields, using short strings, preferring PBM-based protection, and generally (also for the certificates being managed) using ECC rather than RSA. 
> I suggest placing some remark like this in sections 2.6 and/or 5.

I would not put too many CMP specific recommendations regarding profiling CMP into the CoAP draft to keep the scope focused. I think a general recommendation to try to keep the CMP messages lean should do.

Hendrik