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<p class="MsoNormal"><span style="font-size:11.0pt">OK, that’s useful. Yeah, if those aren’t the defaults in RFC9172 (which I suspect they’re not) then we at least have to profile 9172 in an annex of the BPsec profile to recommend those lengths.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thx,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> --keith<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Mehmet Adalier <madalier@antarateknik.com><br>
<b>Date: </b>Tuesday, November 22, 2022 at 4:06 PM<br>
<b>To: </b>Dr. Keith L Scott <kscott@mitre.org>, sis-dtn@mailman.ccsds.org <sis-dtn@mailman.ccsds.org>, sea-sec@mailman.ccsds.org <sea-sec@mailman.ccsds.org><br>
<b>Cc: </b>Peter Shames <peter.shames@jpl.nasa.gov><br>
<b>Subject: </b>[EXT] Re: [Sis-dtn] SIS-DTN BPsec Profile<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Keith,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Not sure whether I am the “Author” on the key size comments.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Regarding algorithms/key sizes I would recommend:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="color:black;mso-list:l1 level1 lfo1"><span style="font-size:11.0pt">Integrity SHA-384 as default<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-list:l1 level1 lfo1"><span style="font-size:11.0pt">Authenticity HMAC-384 (signed hashed) as default<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-list:l1 level1 lfo1"><span style="font-size:11.0pt">Confidentiality AES-CGM 256 as default<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The key sizes above would be in line with the security blue/green books<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">v/r,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Mehmet<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">SIS-DTN <sis-dtn-bounces@mailman.ccsds.org> on behalf of "Dr. Keith L Scott via SIS-DTN" <sis-dtn@mailman.ccsds.org><br>
<b>Reply-To: </b>"Dr. Keith L Scott" <kscott@mitre.org><br>
<b>Date: </b>Tuesday, November 22, 2022 at 11:04 AM<br>
<b>To: </b>"sis-dtn@mailman.ccsds.org" <sis-dtn@mailman.ccsds.org>, "sea-sec@mailman.ccsds.org" <sea-sec@mailman.ccsds.org><br>
<b>Cc: </b>Peter Shames <peter.shames@jpl.nasa.gov><br>
<b>Subject: </b>[Sis-dtn] SIS-DTN BPsec Profile</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:11.0pt">Greetings,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">We have a joint meeting scheduled on Friday Dec 2. This is nominally one of the monthly meetings to discuss the new BPsec Green Book, but I’d like to propose taking the December 2 meeting to discuss the BPsec
Blue Book Profile.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I had a discussion w/ Howie the other day that resulted in a number of changes to the document:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Authenticity</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Antonias had several comments around authenticity and whether or not it made any sense to provide integrity without authenticity. I could envision a mission that wanted to provide data integrity on the science
data it was returning, but might not need/want to provide authenticity. The assumption here would be (I suppose) that it wouldn’t make sense for anyone to fake the data (e.g. a faked image purportedly from Pluto Express showing a sign on the surface “I want
to be a planet again.”?)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">That said, it seems like the services missions might want to choose from / implement are:<o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2"><span style="font-size:11.0pt">Integrity<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2"><span style="font-size:11.0pt">Authenticity<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2"><span style="font-size:11.0pt">Confidentiality<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">[I’ll admit to being a bit confused by this; MY model for authenticity would be to use some sort of signed hash on the primary bundle block (which includes the source EID), though I suppose other mechanisms
are possible].<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">In the document I tried to use “authenticity / integrity” where appropriate, and to otherwise mention authenticity where I thought it was appropriate. I’d be interested if folks think I got close to right.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I still need to add some text around the ‘pick-list’ notion of integrity / authenticity / confidentiality above.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Security Contexts</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I added some text about security contexts and moved other text around so that security contexts now show up earlier than they used to.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Default Security Contexts</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">RFC9173 contains a set of default security contexts for BPsec:<o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo3"><span style="font-size:11.0pt">Integrity Security Context BIB-HMAC-SHA2<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l3 level1 lfo3"><span style="font-size:11.0pt">Security Context BCB-AES-GCM<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I think the questions I’d like to get at at next week’s telecon is:<o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo4"><span style="font-size:11.0pt">Do we need a set of default security contexts for the CCSDS Profile of BPsec?<o:p></o:p></span></li><ul style="margin-top:0in" type="circle">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level2 lfo4"><span style="font-size:11.0pt">I think so. Maybe not even mandatory to implement but at least a defined set that can be used for testing?<o:p></o:p></span></li></ul>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo4"><span style="font-size:11.0pt">If the answer to the above is in fact ‘yes’ – what should we use for the default profiles? The current book has (I think) essentially RCC9172 pulled
in, but then it looks like somebody (apologies, the changes are only marked as ‘Author’) seems to have suggested changing some of the recommended key sizes.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt">So, if we could at least start talking about a nominal set of security contexts for the profile I think that would get us a LOT further down the road to getting the book out.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> v/r,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> --keith<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">_______________________________________________ SIS-DTN mailing list SIS-DTN@mailman.ccsds.org https://mailman.ccsds.org/cgi-bin/mailman/listinfo/sis-dtn
<o:p></o:p></span></p>
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