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Re: [core] Reading -13

Francesca Palombini <francesca.palombini@ericsson.com> Tue, 24 July 2018 18:08 UTC

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From: Francesca Palombini <francesca.palombini@ericsson.com>
To: Jim Schaad <ietf@augustcellars.com>, "draft-ietf-core-object-security@ietf.org" <draft-ietf-core-object-security@ietf.org>
CC: 'Core' <core@ietf.org>
Thread-Topic: Reading -13
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Date: Tue, 24 Jul 2018 18:08:52 +0000
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Subject: Re: [core] Reading -13
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Hi all,

I just wanted to point to the wg that, following discussion in Montreal, I have now compiled the modifications in 5 different pull requests (inline for links), to simplify the review. Jim has already started reviewing those, please feel free to follow the discussion on the github!  https://github.com/core-wg/oscoap/ 

Thanks Jim for the review and for the useful discussion in Montreal!

Francesca

> -----Original Message-----
> From: Jim Schaad <ietf@augustcellars.com>
> Sent: den 11 juli 2018 19:32
> To: draft-ietf-core-object-security@ietf.org
> Cc: 'Core' <core@ietf.org>
> Subject: Reading -13
> 
> * Section 4.1.3.1 - I am unclear why an OSCORE error response can be cached
> by an OSCORE unaware intermediate would be cached, but a success
> message is never going to be cached.  Based on this, I don't plan to set an
> outer Max-Age option.
> 

Clarified in https://github.com/core-wg/oscoap/pull/235


> * In section 5.4 you have the text
> 
> request_piv: contains the value of the 'Partial IV' in the COSE object of the
> request (see Section 5), with one exception: in case of protection or
> verification of Observe cancellations, the request_piv contains the value of
> the 'Partial IV' in the COSE object of the corresponding registration (see
> Section 4.1.3.5.1).
> 
> I am unclear how/why this is different for observations.   A cancelation is
> a message, so the IV is the request.  A re-registration is a request message,
> any response would correspond to that request.  The only interesting
> question has to do with updating the MID on a re-registration but not how
> PIVs work for this field.
> 

Cancellations do not have special processing of request_piv in https://github.com/core-wg/oscoap/pull/236

> * Section 6.1 - Is a registry needed for the leading byte of compression?
> Behavior if bits 0, 1, or 2 is set in the flags byte on decode?
> 

Adding a registry in https://github.com/core-wg/oscoap/pull/237


> * Section C - given the way that my system is implemented, it would be nice if
> the outputs included the first full IV to be used for both the sender and the
> recipient.  That would allow for a test that the combination of ids and
> common ivs is done correctly.  In my case I do not have the shared IV
> available for testing as I immediately or in the id.
> 
> 

Adding the nonces for the test vectors in https://github.com/core-wg/oscoap/pull/239

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