Re: [Geopriv] draft-ietf-geopriv-lbyr-requirements-02 ???
"Roger Marshall" <RMarshall@telecomsys.com> Tue, 08 July 2008 23:51 UTC
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Thread-Topic: [Geopriv] draft-ietf-geopriv-lbyr-requirements-02 ???
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From: Roger Marshall <RMarshall@telecomsys.com>
To: "Thomson, Martin" <Martin.Thomson@andrew.com>, "James M. Polk" <jmpolk@cisco.com>, Hannes Tschofenig <Hannes.Tschofenig@gmx.net>
Cc: GEOPRIV <geopriv@ietf.org>
Subject: Re: [Geopriv] draft-ietf-geopriv-lbyr-requirements-02 ???
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Martin: I agree with your suggestion of a random-unique concatenation, and so there is some new text in the just posted next version, -03. Sorry for the lateness of my response. -roger. > -----Original Message----- > From: Thomson, Martin [mailto:Martin.Thomson@andrew.com] > Sent: Tuesday, April 01, 2008 3:30 PM > To: Roger Marshall; James M. Polk; Hannes Tschofenig > Cc: GEOPRIV > Subject: RE: [Geopriv] draft-ietf-geopriv-lbyr-requirements-02 ??? > > As James said, the point is that the URI be hard to guess iff > possession implies permission. > > To implement the "hard to guess" bit we recommend a random number. > However, that doesn't obviate the other requirement, which is > that a location URI must refer to a location - if it isn't > unique, then the server can't be sure which result to > provide. Therefore, it needs to be BOTH unique and hard to guess. > > There isn't anything preventing both uniqueness and > randomness from being used at the same time, just concatenate > a random number and sequence number together. I note that > often people rely on the odds of a collision with massive > random numbers to provide an approximation of uniqueness. > > Cheers, > Martin > > > -----Original Message----- > > From: geopriv-bounces@ietf.org [mailto:geopriv-bounces@ietf.org] On > > Behalf Of Roger Marshall > > Sent: Wednesday, 2 April 2008 9:05 AM > > To: James M. Polk; Hannes Tschofenig > > Cc: GEOPRIV > > Subject: Re: [Geopriv] draft-ietf-geopriv-lbyr-requirements-02 ??? > > > > The Philly geopriv minutes reference a "129 bits of entropy...EKR > > statement..." - besides the obvious typo, the 128 bits of entropy > there > > related to the security draft, > > http://www3.tools.ietf.org/html/draft-barnes-geopriv-lo-sec-02, > whereas > > the stuff below came from a couple of Richard's (and others) > discussion > > thread on Q3: > > > > 1. a snippet of Richard's response of one such message... > > > > R*: The dereference protocol MUST define an anonymized format for > > location URIs. This format MUST identify the desired LO > by a random > > token with at least 128 bits of entropy (rather than an > > ! ^^^^^^^^^^^^^^^^^^^ > > explicit identifier, such as an IP address). Any URI whose > > dereference will not subject to authentication and access > control MUST > > be anonymized. > > > > Link to above message: > > http://www.ietf.org/mail-archive/web/geopriv/current/msg05352.html > > > > > > 2. ...also an earlier email talking about (base) number > examples which > > don't work... > > > > Example 1: Using a 5-digit number doesn't work, because that's only > 10k > > queries, and I can write a script to run through those in a few > > minutes. > > > > Thus, you need more digits. > > > > Example 2: Using a 32-byte number doesn't work if you assign it > > sequentially, since I can just start from the bottom and win a lot > > faster than at random. Thus, the numbers need to be assigned at > > random. > > > > Link to complete message: > > http://www.ietf.org/mail-archive/web/geopriv/current/msg05346.html > > > > What was the resolution between unique & random? Whatever the > outcome, > > it should probably be inserted into the lbyr-requirements > draft, yes? > > > > -roger marshall. > > > > > -----Original Message----- > > > From: James M. Polk [mailto:jmpolk@cisco.com] > > > Sent: Tuesday, April 01, 2008 1:36 PM > > > To: Roger Marshall; Hannes Tschofenig > > > Cc: GEOPRIV > > > Subject: Re: [Geopriv] draft-ietf-geopriv-lbyr-requirements-02 ??? > > > > > > Roger > > > > > > There were comments in Philly that 128 was an arbitrary number > > > without backing, so why was it picked. There was also > discussion on > > > the difference between unique and random in Philly, which was > > > resolved -- but that doesn't mean either issue is dropped. > > > > > > James > > > > > > At 03:03 PM 4/1/2008, Roger Marshall wrote: > > > >The following summarizes the third of the three original subj: > > > >questions, Q1,Q2,Q3: > > > > > > > >Q3. > > > > > > > >...about draft-ietf-geopriv-lbyr-requirements-01 > > > >Sent: Friday, February 15, 2008 4:24 PM, From: James M. Polk > > > > > > > > > > > > > > I may have missed the text, but I don't see it in a > > > requirement -- > > > > > but at the last meeting, I was told by James W and Hannes > > > that each > > > > > LbyR URI MUST be unique. I don't read that anywhere > in this ID. > > > > > > > > > > I read that "...it MUST be hard to guess..." > > > > > > > > > > why can't all 200 participants in the room draw from a > > > smaller pool > > > > > of numbers that a cryptographically random value? It > > > would still be > > > > > "hard to guess" who has which identifier... > > > > > > > >Not much discussion here, but there seemed to be two > > > differing views on > > > >this: > > > > > > > >[a.] One view (Hannes) is that we need to add a new > requirement... > > > > > > > > > [...from...] Tschofenig, Hannes > > > > > Sent: Sunday, February 17, 2008 3:48 AM > > > > > Subject: Re: [Geopriv] Q3 about > > > >draft-ietf-geopriv-lbyr-requirements-01 > > > > > > > > > > Uniqueness is very important. The draft should really > have such > a > > > > > requirement. Saying that a part of the identifier is > > > random is not > > > > > enough. > > > > > > > > > > We need to add a requirement. > > > > > > > >[b.] the other view, (James P. responding to Richard's > clarification > > > >q's), seems to take some exception with the idea of a new req. > > > > > > > >[...from...] James M. Polk > > > >Sent: Sunday, February 17, 2008 7:05 PM To: Richard Barnes; > > > Tschofenig, > > > >Hannes > > > >Subject: Re: [Geopriv] Q3 about > > > draft-ietf-geopriv-lbyr-requirements-01 > > > > > > > > > > At 08:27 PM 2/17/2008, Richard Barnes wrote: > > > > > >Could you two clarify what you mean by "unique"? > > > > > > > > > > well, this is part of what I was getting at. For example, > > > within RFC > > > > > 3261, the Call-ID value "MUST be unique through space and > > > time" -- > > > > > meaning the alphanumeric value is never repeatable by any > > > UA ever, > > > > > not just within the same UA. > > > > > > > > > > This is reeeeally unique. > > > > > > > > > > I think this is more than we need here. > > > > > > > > > > >That is, within what scope should the URI be unique? > > > > > > > > > > I think a URI has to be unique within a LIS for all > clients that > > > > > have asked for one. I'm not sure we need to be any more > > > unique than > > > > > that. > > > > > > > > > > >Do you mean to prevent the LS from issuing multiple URIs > > > > > that refer to > > > > > >the same location? > > > > > > > > > > I actually don't see a problem in this... but I could be > > > wrong (and > > > > > want to know why I'm wrong BTW) > > > > > > > > > > >Or are you trying to rule out a case where an LS just hands > > > > > out one URI > > > > > >(or a few URIs), then hands out different LOs depending > > > on who asks > > > > > >(i.e., the LS uses one URI to refer to multiple LOs)? > > > > > > > > > > No, from my pov, unique means that a LIS has one unique > > > URI for each > > > > > client that has asked for one. > > > > > > > > > > I do not believe this URI has to be unique from > what's given out > > > > > tomorrow, as long as no two clients have the same URI. > > > > > This is one of the uses of the valid-for parameter (that both > the > > > > > DHCP Option ID and HELD ID have). My client shouldn't > > > necessarily > > > > > always be given the same URI, since there is no real guarantee > it > > > > > won't be compromised, someone will always have knowledge > > > of my URI > > > > > once they learn it once. > > > > > > > > > > Having my URI change periodically has a benefit, as > long as it > > > > > doesn't change sooner than the active timer of the 'valid-for' > > > > > parameter is set (unless there's been a new request and a > > > particular > > > > > client's URI has been overwritten. > > > > > > > >SUMMARY: > > > >I don't have any further record of any progression on the > > > topic, which > > > >kept me from adding said requirement in -02. What should the > > > >resolution now be? > > > > > > > >Thanks. > > > > > > > >-roger marshall. > > > > > > > > > -----Original Message----- > > > > > From: geopriv-bounces@ietf.org > > > > > [mailto:geopriv-bounces@ietf.org] On Behalf Of James M. Polk > > > > > Sent: Monday, March 31, 2008 1:19 PM > > > > > To: Hannes Tschofenig > > > > > Cc: GEOPRIV > > > > > Subject: Re: [Geopriv] draft-ietf-geopriv-lbyr-requirements-02 > > ??? > > > > > > > > > > At 07:53 AM 3/30/2008, Hannes Tschofenig wrote: > > > > > >It seems that you are saying that Roger has to keep things > > going. > > > > > > > > > > All I'm saying is that there was never a post > > > articulating what the > > > > > consensus reached answers were to each of the 3 questions > > > I asked on > > > > > the list. I don't believe that is asking a lot. Do you > > > think this > > > > > is asking too much? > > > > > > > > > > Each of the 3 questions had ~ 5 to 75 responses, so there > > > were a lot > > > > > of folks interested in the questions, and obviously the first > > > > > response didn't answer any of the 3 Qs right away. > > > > > > > > > > > > > > > >Roger, could you post a description of the outstanding > > > issues with > > > > > >a suggestions on how to address them? > > > > > > > > > > > >Ciao > > > > > >Hannes > > > > > > > > > > > >James M. Polk wrote: > > > > > > > At 12:40 PM 3/29/2008, Hannes Tschofenig wrote: > > > > > > >> Given the status of HELD this document should have been > > > > > finished a > > > > > > >> while ago. > > > > > > >> I am not even sure whether I have seen a WGLC for it. > > > > > > >> > > > > > > >> What are the next steps for it? > > > > > > >> Why isn't it done already? > > > > > > > > > > > > > > weeeeelllll.... > > > > > > > > > > > > > > There were 3 fairly substantiative questions posted > > > > > against -01 of > > > > > > > the ID just before the -0X deadline, and there needs to > > > > > be time for > > > > > > > proper review of -02 to see if this version answers at > > > > > least these 3 questions. > > > > > > > > > > > > > > I think 1 has been answered > > > > > > > > > > > > > > I think another has not reached consensus > > > > > > > > > > > > > > and the last wasn't answered at all > > > > > > > > > > > > > > but this is memory (which may or may not be reliable) > > > > > > > > > > > > > > > > > > > > >> _______________________________________________ > > > > > > >> Geopriv mailing list > > > > > > >> Geopriv@ietf.org > > > > > > >> https://www.ietf.org/mailman/listinfo/geopriv > > > > > > > > > > > >_______________________________________________ > > > > > >Geopriv mailing list > > > > > >Geopriv@ietf.org > > > > > >https://www.ietf.org/mailman/listinfo/geopriv > > > > > > > > > > _______________________________________________ > > > > > Geopriv mailing list > > > > > Geopriv@ietf.org > > > > > https://www.ietf.org/mailman/listinfo/geopriv > > > > > > > > > > > > > > > > >CONFIDENTIALITY NOTICE: The information contained in this > > > message may > > > >be privileged and/or confidential. 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Any unauthorized use of > this email is prohibited. > -------------------------------------------------------------- > ---------------------------------- > [mf2] > > _______________________________________________ Geopriv mailing list Geopriv@ietf.org https://www.ietf.org/mailman/listinfo/geopriv
- [Geopriv] draft-ietf-geopriv-lbyr-requirements-02… Hannes Tschofenig
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… James M. Polk
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Hannes Tschofenig
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… James M. Polk
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Roger Marshall
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Roger Marshall
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… James M. Polk
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Roger Marshall
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… James M. Polk
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Roger Marshall
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Winterbottom, James
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Thomson, Martin
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… James M. Polk
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… James M. Polk
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Winterbottom, James
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Roger Marshall
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Roger Marshall
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Roger Marshall
- [Geopriv] draft-ietf-geopriv-lbyr-requirements-02… Thomson, Martin
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… James M. Polk
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Thomson, Martin
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Thomson, Martin
- Re: [Geopriv] draft-ietf-geopriv-lbyr-requirement… Roger Marshall