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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I never had a response to my recommendation.  I made this recommendation for compatibility with AOS, proximity 1 and USLP since these protocols can be used
 in both directions thus the PVN is not a discriminator.   TM and TC have a 2 bit PVN and they are both ‘00’.  
<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""> Greenberg, Edward (312B)
<br>
<b>Sent:</b> Friday, March 31, 2017 2:24 PM<br>
<b>To:</b> 'Moury Gilles'; Daniel.Fischer@esa.int; sls-sea-dls@mailman.ccsds.org<br>
<b>Subject:</b> RE: [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The SCID identifies the Spacecraft.  The SOURCE/DESTINATION FLAG identifies the sending side or the receiving side.  Thus by including the SOURCE/DESTINATION
 FLAG into the GVCID/GMAPID you determine the sending side GVCID verses the receiving side GVCID.  By simply modifying the term GVCID to GVCIDS for the sending side and GVCIDR for the receiving side you separate the VCs by directionality which is exactly what
 you want.  <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""> SLS-SEA-DLS [<a href="mailto:sls-sea-dls-bounces@mailman.ccsds.org">mailto:sls-sea-dls-bounces@mailman.ccsds.org</a>]
<b>On Behalf Of </b>Moury Gilles<br>
<b>Sent:</b> Friday, March 31, 2017 2:00 AM<br>
<b>To:</b> <a href="mailto:Daniel.Fischer@esa.int">Daniel.Fischer@esa.int</a>; <a href="mailto:sls-sea-dls@mailman.ccsds.org">
sls-sea-dls@mailman.ccsds.org</a><br>
<b>Subject:</b> Re: [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR" 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">My response to David’s questions would be :<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">Q1 : values 0 and 65535 are reserved (for master keys I understand). Text should be modified.<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 lang="FR" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Q2 : EP baseline mode relies on SDLS baseline mode.
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">SDLS baseline mode uses AES-GCM. In that case, the SN is replaced by the IV which is 96 bits. Therefore, the Set ARC procedure of the EP baseline mode is actually setting
 the IV. I would recommend adding this clarification in the EP baseline mode specification and changing the length of the “New anti-replay counter value” field from 64 to 96 bits for consistency with SDLS baseline mode.<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">Q3 : My proposal would be the following:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<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 the EP baseline mode, a format is specified for the GVCID/GMAPID field of the  Start SA PDU with the following sub-fields:<o:p></o:p></span></p>
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<![if !supportLists]><span style="font-size:11.0pt;font-family:"Courier New";color:#1F497D"><span style="mso-list:Ignore">o<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">TFVN (4 bits)<o:p></o:p></span></p>
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<![if !supportLists]><span style="font-size:11.0pt;font-family:"Courier New";color:#1F497D"><span style="mso-list:Ignore">o<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">SCID (16 bits)<o:p></o:p></span></p>
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<![if !supportLists]><span style="font-size:11.0pt;font-family:"Courier New";color:#1F497D"><span style="mso-list:Ignore">o<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">VCID (6 bits)<o:p></o:p></span></p>
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<![if !supportLists]><span style="font-size:11.0pt;font-family:"Courier New";color:#1F497D"><span style="mso-list:Ignore">o<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">MAPID (6bits)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<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">Since we have specified TFVN sub-field length as 4 bits, we have 2 spare bits there. We could use one of them to distinguish TC from TM : ‘000’ would
 code for TC TFVN and ‘100’ would code for TM TFVN, while ‘001’ would code for AOS and ‘010’ for Prox-1 (which is not covered by SDLS by the way).<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">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Gilles<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"><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:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Gilles MOURY</span><span style="color:#1F497D">
<br>
</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">CNES Toulouse</span><span style="color:#1F497D">
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">De :</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> SLS-SEA-DLS [<a href="mailto:sls-sea-dls-bounces@mailman.ccsds.org">mailto:sls-sea-dls-bounces@mailman.ccsds.org</a>]
<b>De la part de</b> <a href="mailto:Daniel.Fischer@esa.int">Daniel.Fischer@es<span lang="FR">a.int</span></a></span><span lang="FR" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""><br>
<b>Envoyé :</b> vendredi 31 mars 2017 08:57<br>
<b>À :</b> <a href="mailto:sls-sea-dls@mailman.ccsds.org">sls-sea-dls@mailman.ccsds.org</a><br>
<b>Objet :</b> [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Dear all,</span><span lang="FR">
<br>
<br>
</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Could ask you to take a look at the questions that David sent a while go...some of them need answers before a red book can be produced.</span><span lang="FR">
<br>
</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif"">My take:</span><span lang="FR">
<br>
</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Q1 is a typo and will be corrected. --> No further discussion needed</span><span lang="FR">
<br>
</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Q2: This should be the case. What do the others think? Do we need to be explicit there?</span><span lang="FR">
<br>
</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Q3: This is a critical one and we don't have an answer at the moment. I remember we discussed this in the WG already but I am not sure we came to a conclusion. This needs to be
 clarified in the standard. Any opinions?</span><span lang="FR"> <br>
<br>
</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Cheers,<br>
Daniel.</span><span lang="FR"> <br>
<br>
</span><b><span lang="FR" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#00A1E0">Dr. Daniel Fischer</span></b><span lang="FR" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray"><br>
Head of the Engineering Support Section, OPS-GES<br>
Ground Systems Engineering Department</span><span lang="FR"> <br>
</span><span lang="FR" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">Directorate of Operations</span><span lang="FR">
<o:p></o:p></span></p>
<p><b><span lang="FR" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">ESA - ESOC</span></b><span lang="FR" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray"><br>
Robert-Bosch-Str. 5, D-64392 Darmstadt, Germany</span><span lang="FR"> <o:p></o:p></span></p>
<p><span lang="FR" style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray">Tel. +49 6151 90 2718 |  E-mail:
<a href="mailto:Daniel.Fischer@esa.int">Daniel.Fischer@esa.int</a></span><span lang="FR">
<br>
</span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:purple">----- Forwarded by Daniel Fischer/esoc/ESA on 31/03/2017 08:51 -----</span><span lang="FR">
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</span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#5F5F5F">From:        </span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif""><a href="mailto:David.Koisser@esa.int">David.Koisser@esa.int</a></span><span lang="FR">
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</span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#5F5F5F">To:        </span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif""><a href="mailto:sls-sea-dls@mailman.ccsds.org">sls-sea-dls@mailman.ccsds.org</a></span><span lang="FR">
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</span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#5F5F5F">Cc:        </span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif"">"John P. Lucas" <<a href="mailto:John.P.Lucas@ivv.nasa.gov">John.P.Lucas@ivv.nasa.gov</a>></span><span lang="FR">
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</span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#5F5F5F">Date:        </span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif"">01/03/2017 11:04</span><span lang="FR">
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</span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#5F5F5F">Subject:        </span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif"">[Sls-sea-dls] Question regarding the SDLS EP Standard</span><span lang="FR">
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</span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#5F5F5F">Sent by:        </span><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif"">"SLS-SEA-DLS" <<a href="mailto:sls-sea-dls-bounces@mailman.ccsds.org">sls-sea-dls-bounces@mailman.ccsds.org</a>></span><span lang="FR">
<o:p></o:p></span></p>
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</span><span lang="FR" style="font-size:10.0pt;font-family:"Calibri","sans-serif"">Dear SDLS WG members,</span><span lang="FR">
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</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
John and I have completed setting up the interoperability testing environment and now we are doing a few finishing touches. Whilst doing this a few questions arose regarding the SDLS EP standard:</span><span lang="FR">
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</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
1. In Section E4.2.2 (in the baseline mode description of Key Activation) and the following key procedures, it defines the Key ID fields to have a length of 16 bits. And then states:</span><span lang="FR">
</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
"Values 0-65535 shall not be used to reference session keys."</span><span lang="FR">
</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
Which would be all possible Key IDs and leave none for any session keys. Can you clarify?</span><span lang="FR">
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</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
2. While we are fairly sure it is implied: Does the M&C procedure Set ARC set the IV instead of the SN parameter in the regarding cases (e.g. AES-GCM)?</span><span lang="FR">
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</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
3. The standard is not addressing how to distinguish if a GVCID is regarding the TM or TC channels for the Start SA procedure. An example to clarify:
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</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
A mission wants a different SA assigned on VC 0 for the uplink (e.g. authentication only) than the VC 0 for the downlink (e.g. authenticated encryption). To be able to set this with the Start SA procedure, it needs a way to distinguish between the TC and TM
 channel mapping to SPIs. As the GVCID is defined as:</span><span lang="FR"> </span>
<span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
GVCID = TFVN + SCID + VCID</span><span lang="FR"> </span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
And the 2 bits long TFVN may have the following values: 01 -> AOS; 10 -> Proximity-1; 00 -> TM- *or* TC-SDLP</span><span lang="FR">
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The GVCID alone is not enough to distinguish between TC and TM and we are currently using a custom data structure for unambiguously identifying the channels in the Start SA procedure.</span><span lang="FR">
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</span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
Best Regards,</span><span lang="FR"> </span><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
David Koisser</span><span lang="FR"> <br>
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