Sorry for the relatively slow response. Comments inline.
On 6/7/19 3:01 AM, 최영환 wrote:
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DISCUSS:
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Thanks to everyone who has worked on this document.
I generally agree with Benjamin's discuss points, and in particular
agree with his comment that it's kind of hard to figure out how all
these pieces work together. I have an additional issue that is
somewhat related to some of the points he raised, but which is (I think) not
completely covered.
I'm really confused about what the purported privacy properties of
this protocol are. In section 4.3 (which I *think* talks about
globally- routable IP addresses, although this is a bit unclear), the document
says:
such an IID SHOULD guarantee a stable IPv6 address
because each data link connection is uniquely identified by the pair
of DSAP and SSAP included in the header of each LLC PDU in NFC
(Aside: this "should" is a simple statement of fact, not a described
behavior of the protocol, and so the use of RFC-2119-style all-caps is
not
appropriate.)
Agreed. I will fix it.
The presence of "a stable IPv6 address" inherently implies the ability
to track devices.
Agreed. I will change them with "a secured and stable IPv6 address". This is ok?
I don't think this changes the issue. Your response below implies that
the address is stable only over very short periods of time, and that
would address my concern. If that's true, then the solution would be to
add text here that qualifies how long the address is stable (e.g.:
"...such an IID should guarantee a stable IPv6 address during the course
of a single connection, because...")
Then, in section 7, I find the following text:
...the short address of
NFC link layer (LLC) is not generated as a physically permanent value
but logically generated for each connection. Thus, every single
touch connection can use a different short address of NFC link with
an extremely short-lived link.
This text seems to imply that addressing information is, in general,
not stable, which appears to flatly contradict the text in section 4.3.
Please clarify, in section 4.3, what the duration of stability of
these identifiers is.
This texts means "NFC applications use short-lived connections, and the every
connection is made with different address."
Just one permanent address is not used for a NFC device. If it looks like the
texts appears to flatly contract the texts in section 4.3, I need to rephrase
the texts for clarification. Thanks. It's good point, I think.
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