Re: [Last-Call] Iotdir last call review of draft-ietf-drip-arch-22

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Hi Stuart,

 

> Thanks for the review! I was asked to address one of your nits,

 

Thank you!

 

> all of your other points having been addressed previously by others

> (we think/hope).

 

I haven't seen any reply from your co-authors and, unless I missed it,

there was no publicly visible updates to the draft version that I

reviewed (-22), so I cannot confirm nor deny :-)

 

> "Bluetooth 4.x" and "Bluetooth 5.x" are intended to distinguish

> between those two major versions, which have differences motivating

> different Broadcast RID message encapsulation, but imply concisely

> that Broadcast RID is insensitive to the minor versions.

 

Sure.

 

> ASTM F3411 requires that if a Broadcast RID sender uses any form of

> Bluetooth, it must use 4.x, with additional use of 5.x being optional.

> The corresponding ASD-STAN for Direct RID states the reverse. Thus

> effectively any implementation intended for international use must

> concurrently transmit over both 4.x and 5.x.

 

!

 

> The Bluetooth specs are voluminous: attempting to cite all those that

> apply here would be quite a rabbit hole; I personally would prefer to

> cite only ASTM F3411 and let the diligent student follow the reference

> trail.

 

Sounds reasonable..

 

> Will our editing the draft to consistently use the forms "4.x" and

> "5.x" suffice?

 

Yes.

 

Cheers, t

 

 

> On 3/27/2022 1:44 PM, Thomas Fossati via Datatracker wrote:

> > Reviewer: Thomas Fossati

> > Review result: Ready with Issues

> >

> > This is a great document and fun to read.  Thank you authors!  I

> > have tried to highlight a few small things that could be articulated

> > a bit more from an IoT perspective but overall I have no major

> > concerns with it, except a tangential thing around the document

> > intended status (see "Issues" below.)

> >

> > # Issues

> >

> > * The charter says: "the WG will propose a standard document that

> > describes the architecture […]" but the status is informational.  I

> > am pretty sure informational should be appropriate, but highlighting

> > a potential disconnect.

> >

> > # Comments

> >

> > * In some IETF circles (e.g., RATS & TEEP) "attestation" has a

> > precise meaning, which is quite distinct from the DRIP definition

> > "[…] normally used when an entity asserts a relationship with

> > another entity".  Specifically, unless the signing key is derived

> > from the measured boot state (a la DICE), or the claims are of a

> > certain kind, the process that this doc names "attestation" is not

> > what is meant usually.

> >     => Maybe add a few words to Section 2.2 to clarify the

> >     distinction between DRIP attestation and RATS's, e.g., by adding

> >     a disclaimer similar to that already associated with DRIP certs.

> >

> > * Apropos "remote attestation", I am wondering whether, given the

> > type of endpoints considered in the architecture - and in particular

> > provided their increased exposure to physical compromise, and the

> > potentially large impact on the overall system and beyond - the

> > architecture should provide explicit channels for securely conveying

> > the verification of the installed and booted firmware (as well as

> > any other relevant trust metrics)?

> >

> > * I haven't read the rest of the DRIP docs, so I am not sure why is

> > EdDSA specifically mentioned in Section 3.2.?  Is this a requirement

> > or just an example?  I guess the latter, but checking just in case.

> > And apropos that, in light of fault attacks on deterministic ECDSA

> > and EdDSA [0] that are potentially easier to carry out against UAs

> > (BTW, how cool is a fault attack w/ private key exfiltration carried

> > out by a chasing drone?) maybe it's worth adding to the security

> > considerations some words around physical attacks and their impact

> > on the choice of signature algorithms?

> >

> > * It'd seem that, given the very low bandwidth, DoS (as well as

> > Denial of View) attacks on communication involving the UA should be

> > quite easy to mount?  Maybe worth spending some words on the

> > argument to describe what the threats are and which mitigations are

> > available.

> >

> > * This is a question more than anything else: given the constrained

> > nature of UAs, I was wondering whether it is envisaged that the

> > end-to-end network path will be realised with the use of more

> > capable (trusted) proxy nodes?  If so, there may be a few security

> > and privacy considerations to be added.

> >

> > # Nits

> >

> > * AAA is usually intended as "Authentication, Authorization, and

> > Accounting" (see also [1]), whereas here it's got four new A's:

> > Attestation, Access Control , Attribution, Audit :-)

> >      => Maybe change it to 7A, A7, AAA+ or similar?

> >

> > * In Section 2.1, the following terms are already in the most recent

> > "RFC Editor Abbreviations List" [1] and can be removed:

> >      * EdDSA

> >      * HIP

> >      * HIT

> >      * HI

> >

> > * Some typographic inconsistency around Bluetooth: Is it 4 or 4.x?

> > 5 or 5.x?

> >      => Stick to one format. (Also maybe add an explicit reference

> >      to the Bluetooth specs.)

> >

> > [0] https://eprint.iacr.org/2020/803

> > [1] https://www.rfc-editor.org/materials/abbrev.expansion.txt

> >

> >

> >

> --

> -----------------------------------------

> Stuart W. Card, PhD, Principal Engineer

> AX Enterprize, LLC  www.axenterprize.com

> 4947 Commercial Drive, Yorkville NY 13495

> 592 Hangar Road, Rome NY 13441

> 

 

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