<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Xiaoyan,<div class=""><br class=""></div><div class="">by now I assume you've found the current NDN spec page</div><div class=""><a href="https://named-data.net/doc/NDN-packet-spec/current/" class="">https://named-data.net/doc/NDN-packet-spec/current/</a></div><div class=""><br class=""></div><div class="">The protocol changes are the results of discussions among the NDN team including Van Jacobson, and with others from the broader community as well, over the last few years; we finally pushed them out earlier this year. Yes we should have a tech report to document all the reasoning behind the changes, just that we are yet to get there. As the project spreading out more widely, the NDN team falls so shorthanded these days:-(</div><div class="">I do hope to see this TR out in some near future:)</div><div class=""><div><br class=""></div><div>Lixia</div><div><br class=""><blockquote type="cite" class=""><div class="">On Nov 9, 2018, at 4:17 AM, Hu, Xiaoyan <<a href="mailto:xhbreezehu@gmail.com" class="">xhbreezehu@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Dear Prof. Zhang, <div class=""><br class=""></div><div class="">Thanks very much for your information about the update in the NDN protocol design. </div><div class="">Would you please offer a pointer that explains why the selector field is deprecated? </div><div class=""><br class=""></div><div class="">Best regards,</div><div class="">Xiaoyan</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="">On Tue, Nov 6, 2018 at 11:36 AM Lixia Zhang <<a href="mailto:lixia@cs.ucla.edu" class="">lixia@cs.ucla.edu</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word;line-break:after-white-space" class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Nov 5, 2018, at 7:20 PM, mengxue <<a href="mailto:mengxue_1224@126.com" target="_blank" class="">mengxue_1224@126.com</a>> wrote:</div><br class="m_1671659275680961176Apple-interchange-newline"><div class=""><div style="line-height:1.7;font-size:14px;font-family:Arial" class=""><div class="">Hi, all </div><div class=""><br class=""></div><div class=""> Thank you for your reading!</div><div class=""> I have some doubts about the security issues of the Interest. What I have learned is that an Interest packet is not secured by design(such as no signature).So I wonder if an attacker can modify the elements of the original Interest, such as changing one name component ,or changing the Selector part or changing the Nonce part or changing the additional part added to the Interest by the developers.</div><div class=""> Thank you very much!</div></div></div></blockquote><br class=""></div><div class="">first, some nits: </div><div class="">- there is no more selector (see the current protocol spec)</div><div class="">- data fetching interests for publicly accessible data are not signed; they have no logical side effect on producers in general (and not signing has the benefit of obscuring requesters).</div><div class="">- an interest can and should be signed, if it leads to an effect (e.g. a command interest).</div><div class=""><br class=""></div><div class="">second: the above mentioned interests modifications assume that an attacker is MIM (man-in-middle, i.e. on interest forwarding path): in this case the attacker can already do denial of service by dropping the interests; modifying interests is likely leading to the same result</div><br class=""></div>_______________________________________________<br class="">
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