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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Caching is a win under THREE conditions ;-)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">a)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">For error control<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">b)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">For sharing the same content among multiple consumers<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">c)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">To smooth out link variability over time.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">For an example of c), the most extreme case is that of DTN. Assume A wants to send contente to C. Node A would send a content for node B to cache because the
link A-B is up; the link A-B may go down, but link B-C comes up, and the content can now be shared from the cache of B to C. But this case covers bandwidth fluctuation due to congestion and/or wireless interface fluctuations. See: F. Bronzino, D. Stojadinovic,
C. Westphal, D. Raychaudhuri, Exploiting Network Awareness to Enhance DASH over Wireless, IEEE CCNC, January 2016
<a href="https://users.soe.ucsc.edu/~cedric/papers/bronzino2016exploiting.pdf">https://users.soe.ucsc.edu/~cedric/papers/bronzino2016exploiting.pdf</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">C.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Ndn-interest [mailto:ndn-interest-bounces@lists.cs.ucla.edu]
<b>On Behalf Of </b>David Oran<br>
<b>Sent:</b> Friday, May 12, 2017 6:51 AM<br>
<b>To:</b> n.boubakr@bit.edu.cn<br>
<b>Cc:</b> ndn-interest@lists.cs.ucla.edu; icnrg@irtf.org<br>
<b>Subject:</b> Re: [Ndn-interest] [icnrg] Caching Dynamic Content<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p><span style="font-family:"Arial","sans-serif"">Caching is a win under two conditions:<br>
a) for error control (recovering from lost Interest or data messages due to congestion, mobility, or other disruptions), or re-fetch of content that is unchanged<br>
b) for sharing the same content among multiple consumers.<o:p></o:p></span></p>
<p><span style="font-family:"Arial","sans-serif"">The former remains useful even if each user gets different content.<o:p></o:p></span></p>
<p><span style="font-family:"Arial","sans-serif"">The latter is useful only if multiple consumers are getting the same identical content, and if the content is unencrypted or encrypted under a shared key.<o:p></o:p></span></p>
<p><span style="font-family:"Arial","sans-serif"">You are right that dynamically generated content that is unique per consumer will not experience any sharing gains though caching, but may have value for error control or temporal sharing.<o:p></o:p></span></p>
<p><span style="font-family:"Arial","sans-serif"">Some privacy advocates recommend that all content be encrypted with non-shared keys, in order to provide protection against correlation attacks, leakage through key sharing not controlled by the consumer, and
perfect forward secrecy (PFS).<o:p></o:p></span></p>
<p><span style="font-family:"Arial","sans-serif"">So, there you have it…<o:p></o:p></span></p>
<p><span style="font-family:"Arial","sans-serif"">On 12 May 2017, at 0:19, n.boubakr@bit.edu.cn wrote:<o:p></o:p></span></p>
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<p style="margin:0in;margin-bottom:.0001pt"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777">Dear all,</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777"><o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777"><o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777">Talking about the in-network caching for dynamic-content on ICN, I have the following miss-understanding:</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777"><o:p></o:p></span></p>
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<li class="MsoNormal" style="color:#777777;mso-list:l0 level1 lfo1"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Let’s take a scenario when two end-users want to access to the same website (e.g. Facebook), they requested facebook.com/home,
well the name appears the same for both users, however, the content of each request is not the same. How does ICN work with this situation, because caching such content is not useful at all (even if the same user requests the same content name, the content
will be different)? Does in-network caching have no benefits with dynamic content? Also, how does the content delivery process in this situation (because Interest/Data packets have not the requester name), how ICN nodes distinguish between the two (N) requesters?</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></li><li class="MsoNormal" style="color:#777777;mso-list:l0 level1 lfo1"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Another question arises, requesting a video from Youtube for example (the video can be cached on any node), however,
the real process is that the Youtube page associated with such video has some dynamic content such as Recommended Videos… Also, the video itself has many ads that appear on the video and they are different from user to another, and cannot be cached, and they
are the main business method for the company. How can ICN treat the business model for such situation, as any company will not migrate to ICN if ICN can not ensure a business achievement?</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></li></ul>
<p style="margin:0in;margin-bottom:.0001pt"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777"><o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777"><o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777">Best regards,</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777"><o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777"> <o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777">Boubakr Nour (Ph.D Candidate)<br>
Beijing Institute of Technology (</span><span lang="ZH-CN" style="font-size:11.0pt;font-family:"MS Gothic";color:#777777">北京理工大学</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#777777">)<o:p></o:p></span></p>
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<p><span style="font-family:"Arial","sans-serif";color:#777777">_______________________________________________<br>
icnrg mailing list<br>
icnrg@irtf.org<br>
<a href="https://www.irtf.org/mailman/listinfo/icnrg"><span style="color:#777777">https://www.irtf.org/mailman/listinfo/icnrg</span></a><o:p></o:p></span></p>
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<p><span style="font-family:"Arial","sans-serif"">DaveO<o:p></o:p></span></p>
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