<font size=2 face="sans-serif">Daniel,</font>
<br><font size=2 face="sans-serif"> SLP
is not meeting on Wednesday and I think they have a priority for USLP discussion
on Thursday.</font>
<br><font size=2 face="sans-serif">Of course Greg can be more precise than
me, but he already pointed out the initial intention to address it
during the SLP WG meeting on Friday AM.</font>
<br><font size=2 face="sans-serif">Moreover Wednesday afternoon some SLP
members will be attending the DTN meeting.</font>
<br>
<br><font size=2 face="sans-serif">You may want to investigate who could
attend it Friday AM to see if there is a kind of quorum.</font>
<br>
<br><font size=2 face="sans-serif">Just my cent....</font>
<br>
<br><font size=2 face="sans-serif">Gian Paolo</font>
<br>
<br>
<br>
<br>
<br>
<br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">Daniel Fischer/esoc/ESA</font>
<br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif">Gian Paolo Calzolari/esoc/ESA@ESA</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Cc:
</font><font size=1 face="sans-serif">"Greenberg, Edward
(312B)" <edward.greenberg@jpl.nasa.gov>, "Moury Gilles"
<Gilles.Moury@cnes.fr>, "Kazz, Greg J (312B)" <greg.j.kazz@jpl.nasa.gov>,
"sls-sea-dls@mailman.ccsds.org" <sls-sea-dls@mailman.ccsds.org></font>
<br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">12/04/2017 07:15</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">Re: [Sls-sea-dls]
Fw: Question regarding the SDLS EP Standard</font>
<br>
<hr noshade>
<br>
<br><font size=2 face="sans-serif">Dear all,</font>
<br>
<br><font size=2 face="sans-serif">I would be still there on Friday but
it may be better to have the discussion on Wednesday or Thursday when the
SDLS group meets as well. I fear that some people might be gone already
on Friday.</font>
<br>
<br><font size=2 face="sans-serif">Cheers,<br>
Daniel</font>
<br>
<br><font size=1 color=#00a1e0 face="Verdana"><b>Dr. Daniel Fischer</b></font><font size=1 color=#808080 face="Verdana"><br>
Head of the Engineering Support Section, OPS-GES<br>
Ground Systems Engineering Department</font>
<br><font size=1 color=#808080 face="Verdana">Directorate of Operations</font>
<p><font size=1 color=#808080 face="Verdana"><b>ESA - ESOC</b><br>
Robert-Bosch-Str. 5, D-64392 Darmstadt, Germany</font>
<p><font size=1 color=#808080 face="Verdana">Tel. +49 6151 90 2718 | E-mail:
Daniel.Fischer@esa.int</font>
<br>
<br>
<br>
<br>
<br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">Gian Paolo Calzolari/esoc/ESA</font>
<br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif">"Kazz, Greg J
(312B)" <greg.j.kazz@jpl.nasa.gov></font>
<br><font size=1 color=#5f5f5f face="sans-serif">Cc:
</font><font size=1 face="sans-serif">"Moury Gilles"
<Gilles.Moury@cnes.fr>, Daniel Fischer/esoc/ESA@ESA, "Greenberg,
Edward (312B)" <edward.greenberg@jpl.nasa.gov>, "sls-sea-dls@mailman.ccsds.org"
<sls-sea-dls@mailman.ccsds.org></font>
<br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">11/04/2017 19:32</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">Re: [Sls-sea-dls]
Fw: Question regarding the SDLS EP Standard</font>
<br>
<hr noshade>
<br>
<br>
<br><font size=3>If you do that first thing on friday am somebody from
sdls may be able to attend too. <br>
<br>
Sent from my iPhone</font>
<br><font size=3><br>
On 11 Apr 2017, at 18:37, Kazz, Greg J (312B) <</font><a href=mailto:greg.j.kazz@jpl.nasa.gov><font size=3 color=blue><u>greg.j.kazz@jpl.nasa.gov</u></font></a><font size=3>>
wrote:<br>
</font>
<br><font size=2 face="Calibri">I think it is a good proposal and it is
a topic we will address during the SLP WG meeting on Friday AM and perhaps
also it could be discussed during the SDLS meeting on Wed.</font>
<br><font size=2 face="Calibri">However, we don’t have a SLS area joint
meeting scheduled in San Antonio. </font>
<br><font size=2 face="Calibri">Perhaps we could take some time on Friday
afternoon in the SLS plenary to come up with a joint way forward based
upon the discussions in those other two forums.</font>
<br><font size=2 face="Calibri"> </font>
<br><font size=2 face="Calibri">G.P. – what do you think?</font>
<br><font size=2 face="Calibri"> </font>
<br><font size=2 face="Calibri">Thanks!</font>
<br><font size=2 face="Calibri">Greg</font>
<br><font size=2 face="Calibri"> </font>
<br><font size=3 face="Calibri"><b>From: </b>Moury Gilles <</font><a href=mailto:Gilles.Moury@cnes.fr><font size=3 color=blue face="Calibri"><u>Gilles.Moury@cnes.fr</u></font></a><font size=3 face="Calibri">><b><br>
Date: </b>Tuesday, April 11, 2017 at 4:08 AM<b><br>
To: </b>"</font><a href=mailto:Daniel.Fischer@esa.int><font size=3 color=blue face="Calibri"><u>Daniel.Fischer@esa.int</u></font></a><font size=3 face="Calibri">"
<</font><a href=mailto:Daniel.Fischer@esa.int><font size=3 color=blue face="Calibri"><u>Daniel.Fischer@esa.int</u></font></a><font size=3 face="Calibri">>,
"Greenberg, Edward (312B)" <</font><a href=mailto:edward.greenberg@jpl.nasa.gov><font size=3 color=blue face="Calibri"><u>edward.greenberg@jpl.nasa.gov</u></font></a><font size=3 face="Calibri">><b><br>
Cc: </b>Greg Kazz <</font><a href=mailto:greg.j.kazz@jpl.nasa.gov><font size=3 color=blue face="Calibri"><u>greg.j.kazz@jpl.nasa.gov</u></font></a><font size=3 face="Calibri">>,
"</font><a href="mailto:sls-sea-dls@mailman.ccsds.org"><font size=3 color=blue face="Calibri"><u>sls-sea-dls@mailman.ccsds.org</u></font></a><font size=3 face="Calibri">"
<</font><a href="mailto:sls-sea-dls@mailman.ccsds.org"><font size=3 color=blue face="Calibri"><u>sls-sea-dls@mailman.ccsds.org</u></font></a><font size=3 face="Calibri">>,
Calzolari Gian-Paolo <</font><a href=mailto:Gian.Paolo.Calzolari@esa.int><font size=3 color=blue face="Calibri"><u>Gian.Paolo.Calzolari@esa.int</u></font></a><font size=3 face="Calibri">><b><br>
Subject: </b>RE: [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard</font>
<br><font size=3 face="Times New Roman"> </font>
<br><font size=2 color=#004080 face="Calibri">Dear Ed,</font>
<br><font size=2 color=#004080 face="Calibri"> </font>
<br><font size=2 color=#004080 face="Calibri">I tend to agree with Daniel
: this problem of GVCID ambiguity for bidirectional spacelinks is a general
problem that will be encountered not only by SDLS EP (for SA management
procedures) but also for all bidirectional protocols like AOS, USLP for
which GVCID does not carry the direction (forward or return) of the VC
we are dealing with. The solution you propose to introduce 2 new IDs (GVCIDS,
GVCIDR) would solve the ambiguity but needs to be agreed SLS-wide. Greg
and Gian-Paolo: what is your opinion ?</font>
<br><font size=2 color=#004080 face="Calibri"> </font>
<br><font size=2 color=#004080 face="Calibri">Best regards,</font>
<br><font size=2 color=#004080 face="Calibri"> </font>
<br><font size=2 color=#004080 face="Calibri">Gilles</font>
<br><font size=2 color=#004080 face="Calibri"> </font>
<br><font size=2 color=#004080 face="Arial">Gilles MOURY</font><font size=3 color=#004080 face="Times New Roman">
</font><font size=2 color=#004080 face="Arial"><br>
CNES Toulouse</font><font size=3 color=#004080 face="Times New Roman">
</font>
<br><font size=2 face="Tahoma"><b>De :</b> </font><a href=mailto:Daniel.Fischer@esa.int><font size=2 color=blue face="Tahoma"><u>Daniel.Fischer@esa.int</u></font></a><font size=2 face="Tahoma">
[</font><a href=mailto:Daniel.Fischer@esa.int><font size=2 color=blue face="Tahoma"><u>mailto:Daniel.Fischer@esa.int</u></font></a><font size=2 face="Tahoma">]
<b><br>
Envoyé :</b> mardi 11 avril 2017 12:32<b><br>
À :</b> Greenberg, Edward (312B)<b><br>
Cc :</b> Moury Gilles; Kazz, Greg J (312B); </font><a href="mailto:sls-sea-dls@mailman.ccsds.org"><font size=2 color=blue face="Tahoma"><u>sls-sea-dls@mailman.ccsds.org</u></font></a><font size=2 face="Tahoma"><b><br>
Objet :</b> RE: [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard</font>
<br><font size=3 face="Times New Roman"> </font>
<br><font size=2 face="Arial">Dear Ed,</font><font size=3 face="Times New Roman">
<br>
</font><font size=2 face="Arial"><br>
Sorry for not coming back to you earlier. I think we will discuss your
recommendation in the upcoming meetings.</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
In my opinion the scope of the impact of the new definitions of the GVCIDR/S
is not limited to SDLS or SDLS Extended Procedures and needs to be discussed
in a wider frame.</font><font size=3 face="Times New Roman"> <br>
</font><font size=2 face="Arial"><br>
Cheers,</font><font size=3 face="Times New Roman"> </font><font size=2 face="Arial"><br>
Daniel</font><font size=3 face="Times New Roman"> <br>
</font><font size=1 color=#00a1e0 face="Verdana"><b><br>
Dr. Daniel Fischer</b></font><font size=1 color=#808080 face="Verdana"><br>
Head of the Engineering Support Section, OPS-GES<br>
Ground Systems Engineering Department</font><font size=3 face="Times New Roman">
</font><font size=1 color=#808080 face="Verdana"><br>
Directorate of Operations</font><font size=3 face="Times New Roman"> </font>
<p><font size=1 color=#808080 face="Verdana"><b>ESA - ESOC</b><br>
Robert-Bosch-Str. 5, D-64392 Darmstadt, Germany</font><font size=3 face="Times New Roman">
</font>
<p><font size=1 color=#808080 face="Verdana">Tel. +49 6151 90 2718 | E-mail:
</font><a href=mailto:Daniel.Fischer@esa.int><font size=1 color=blue face="Verdana"><u>Daniel.Fischer@esa.int</u></font></a><font size=3 face="Times New Roman">
<br>
<br>
<br>
</font><font size=1 color=#5f5f5f face="Arial"><br>
From: </font><font size=1 face="Arial">"Greenberg,
Edward (312B)" <</font><a href=mailto:edward.greenberg@jpl.nasa.gov><font size=1 color=blue face="Arial"><u>edward.greenberg@jpl.nasa.gov</u></font></a><font size=1 face="Arial">></font><font size=3 face="Times New Roman">
</font><font size=1 color=#5f5f5f face="Arial"><br>
To: </font><font size=1 face="Arial">Moury Gilles
<</font><a href=mailto:Gilles.Moury@cnes.fr><font size=1 color=blue face="Arial"><u>Gilles.Moury@cnes.fr</u></font></a><font size=1 face="Arial">>,
"</font><a href=mailto:Daniel.Fischer@esa.int><font size=1 color=blue face="Arial"><u>Daniel.Fischer@esa.int</u></font></a><font size=1 face="Arial">"
<</font><a href=mailto:Daniel.Fischer@esa.int><font size=1 color=blue face="Arial"><u>Daniel.Fischer@esa.int</u></font></a><font size=1 face="Arial">>,
"</font><a href="mailto:sls-sea-dls@mailman.ccsds.org"><font size=1 color=blue face="Arial"><u>sls-sea-dls@mailman.ccsds.org</u></font></a><font size=1 face="Arial">"
<</font><a href="mailto:sls-sea-dls@mailman.ccsds.org"><font size=1 color=blue face="Arial"><u>sls-sea-dls@mailman.ccsds.org</u></font></a><font size=1 face="Arial">></font><font size=3 face="Times New Roman">
</font><font size=1 color=#5f5f5f face="Arial"><br>
Cc: </font><font size=1 face="Arial">"Kazz,
Greg J (312B)" <</font><a href=mailto:greg.j.kazz@jpl.nasa.gov><font size=1 color=blue face="Arial"><u>greg.j.kazz@jpl.nasa.gov</u></font></a><font size=1 face="Arial">></font><font size=3 face="Times New Roman">
</font><font size=1 color=#5f5f5f face="Arial"><br>
Date: </font><font size=1 face="Arial">11/04/2017
01:36</font><font size=3 face="Times New Roman"> </font><font size=1 color=#5f5f5f face="Arial"><br>
Subject: </font><font size=1 face="Arial">RE:
[Sls-sea-dls] Fw: Question regarding the SDLS EP Standard</font><font size=3 face="Times New Roman">
</font>
<div align=center>
<hr noshade></div>
<br><font size=3 face="Times New Roman"><br>
<br>
</font><font size=2 color=#004080 face="Calibri"><br>
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’. <br>
</font><font size=3 face="Times New Roman"> </font><font size=2 face="Tahoma"><b><br>
From:</b> Greenberg, Edward (312B) <b><br>
Sent:</b> Friday, March 31, 2017 2:24 PM<b><br>
To:</b> 'Moury Gilles'; </font><a href=mailto:Daniel.Fischer@esa.int><font size=2 color=blue face="Tahoma"><u>Daniel.Fischer@esa.int</u></font></a><font size=2 face="Tahoma">;
</font><a href="mailto:sls-sea-dls@mailman.ccsds.org"><font size=2 color=blue face="Tahoma"><u>sls-sea-dls@mailman.ccsds.org</u></font></a><font size=2 face="Tahoma"><b><br>
Subject:</b> RE: [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard</font><font size=3 face="Times New Roman">
<br>
</font><font size=2 color=#004080 face="Calibri"><br>
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. </font><font size=3 face="Times New Roman">
</font><font size=2 color=#004080 face="Calibri"><br>
</font><font size=3 face="Times New Roman"> </font><font size=2 face="Tahoma"><b><br>
From:</b> SLS-SEA-DLS [</font><a href="mailto:sls-sea-dls-bounces@mailman.ccsds.org"><font size=2 color=blue face="Tahoma"><u>mailto:sls-sea-dls-bounces@mailman.ccsds.org</u></font></a><font size=2 face="Tahoma">]
<b>On Behalf Of </b>Moury Gilles<b><br>
Sent:</b> Friday, March 31, 2017 2:00 AM<b><br>
To:</b> </font><a href=mailto:Daniel.Fischer@esa.int><font size=2 color=blue face="Tahoma"><u>Daniel.Fischer@esa.int</u></font></a><font size=2 face="Tahoma">;
</font><a href="mailto:sls-sea-dls@mailman.ccsds.org"><font size=2 color=blue face="Tahoma"><u>sls-sea-dls@mailman.ccsds.org</u></font></a><font size=2 face="Tahoma"><b><br>
Subject:</b> Re: [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard</font><font size=3 face="Times New Roman">
<br>
</font><font size=2 color=#004080 face="Calibri"><br>
Dear all,</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri"><br>
</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri"><br>
My response to David’s questions would be :</font><font size=3 face="Times New Roman">
</font><font size=2 color=#004080 face="Calibri"><br>
</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri"><br>
Q1 : values 0 and 65535 are reserved (for master keys I understand). Text
should be modified.</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri"><br>
</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri"><br>
Q2 : EP baseline mode relies on SDLS baseline mode. 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.</font><font size=3 face="Times New Roman">
</font><font size=2 color=#004080 face="Calibri"><br>
</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri"><br>
Q3 : My proposal would be the following:</font><font size=3 face="Times New Roman">
</font><font size=2 color=#004080 face="Symbol"><br>
· </font><font size=2 color=#004080 face="Times New Roman"> </font><font size=2 color=#004080 face="Symbol">
</font><font size=2 color=#004080 face="Times New Roman"> </font><font size=2 color=#004080 face="Symbol">
</font><font size=2 color=#004080 face="Times New Roman"> </font><font size=2 color=#004080 face="Symbol">
</font><font size=2 color=#004080 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri">For
the EP baseline mode, a format is specified for the GVCID/GMAPID field
of the Start SA PDU with the following sub-fields:</font><font size=3 face="Times New Roman">
</font><font size=2 color=#004080 face="Courier New"><br>
o </font><font size=2 color=#004080 face="Calibri">TFVN (4 bits)</font><font size=3 face="Times New Roman">
</font><font size=2 color=#004080 face="Courier New"><br>
o </font><font size=2 color=#004080 face="Calibri">SCID (16 bits)</font><font size=3 face="Times New Roman">
</font><font size=2 color=#004080 face="Courier New"><br>
o </font><font size=2 color=#004080 face="Calibri">VCID (6 bits)</font><font size=3 face="Times New Roman">
</font><font size=2 color=#004080 face="Courier New"><br>
o </font><font size=2 color=#004080 face="Calibri">MAPID (6bits)</font><font size=3 face="Times New Roman">
</font><font size=2 color=#004080 face="Symbol"><br>
· </font><font size=2 color=#004080 face="Times New Roman"> </font><font size=2 color=#004080 face="Symbol">
</font><font size=2 color=#004080 face="Times New Roman"> </font><font size=2 color=#004080 face="Symbol">
</font><font size=2 color=#004080 face="Times New Roman"> </font><font size=2 color=#004080 face="Symbol">
</font><font size=2 color=#004080 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri">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).</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri"><br>
</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri"><br>
Best regards,</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri"><br>
Gilles</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri"><br>
</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri"><br>
</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Calibri"><br>
</font><font size=3 face="Times New Roman"> </font><font size=2 color=#004080 face="Arial"><br>
Gilles MOURY</font><font size=3 color=#004080 face="Times New Roman"> </font><font size=2 color=#004080 face="Arial"><br>
CNES Toulouse</font><font size=3 color=#004080 face="Times New Roman">
</font><font size=2 face="Tahoma"><b><br>
De :</b> SLS-SEA-DLS [</font><a href="mailto:sls-sea-dls-bounces@mailman.ccsds.org"><font size=2 color=blue face="Tahoma"><u>mailto:sls-sea-dls-bounces@mailman.ccsds.org</u></font></a><font size=2 face="Tahoma">]
<b>De la part de</b> </font><a href=mailto:Daniel.Fischer@esa.int><font size=2 color=blue face="Tahoma"><u>Daniel.Fischer@esa.int</u></font></a><font size=2 face="Tahoma"><b><br>
Envoyé :</b> vendredi 31 mars 2017 08:57<b><br>
À :</b> </font><a href="mailto:sls-sea-dls@mailman.ccsds.org"><font size=2 color=blue face="Tahoma"><u>sls-sea-dls@mailman.ccsds.org</u></font></a><font size=2 face="Tahoma"><b><br>
Objet :</b> [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard</font><font size=3 face="Times New Roman">
<br>
</font><font size=2 face="Arial"><br>
Dear all,</font><font size=3 face="Times New Roman"> </font><font size=2 face="Arial"><br>
<br>
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.</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
My take:</font><font size=3 face="Times New Roman"> </font><font size=2 face="Arial"><br>
Q1 is a typo and will be corrected. --> No further discussion needed</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
Q2: This should be the case. What do the others think? Do we need to be
explicit there?</font><font size=3 face="Times New Roman"> </font><font size=2 face="Arial"><br>
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?</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
<br>
Cheers,<br>
Daniel.</font><font size=3 face="Times New Roman"> </font><font size=1 color=#00a1e0 face="Verdana"><b><br>
<br>
Dr. Daniel Fischer</b></font><font size=1 color=#808080 face="Verdana"><br>
Head of the Engineering Support Section, OPS-GES<br>
Ground Systems Engineering Department</font><font size=3 face="Times New Roman">
</font><font size=1 color=#808080 face="Verdana"><br>
Directorate of Operations</font><font size=3 face="Times New Roman"> </font>
<p><font size=1 color=#808080 face="Verdana"><b>ESA - ESOC</b><br>
Robert-Bosch-Str. 5, D-64392 Darmstadt, Germany</font><font size=3 face="Times New Roman">
</font>
<p><font size=1 color=#808080 face="Verdana">Tel. +49 6151 90 2718 | E-mail:
</font><a href=mailto:Daniel.Fischer@esa.int><font size=1 color=blue face="Verdana"><u>Daniel.Fischer@esa.int</u></font></a><font size=3 face="Times New Roman">
</font><font size=1 color=#800080 face="Arial"><br>
----- Forwarded by Daniel Fischer/esoc/ESA on 31/03/2017 08:51 -----</font><font size=3 face="Times New Roman">
</font><font size=1 color=#5f5f5f face="Arial"><br>
<br>
From: </font><a href=mailto:David.Koisser@esa.int><font size=1 color=blue face="Arial"><u>David.Koisser@esa.int</u></font></a><font size=3 face="Times New Roman">
</font><font size=1 color=#5f5f5f face="Arial"><br>
To: </font><a href="mailto:sls-sea-dls@mailman.ccsds.org"><font size=1 color=blue face="Arial"><u>sls-sea-dls@mailman.ccsds.org</u></font></a><font size=3 face="Times New Roman">
</font><font size=1 color=#5f5f5f face="Arial"><br>
Cc: </font><font size=1 face="Arial">"John
P. Lucas" <</font><a href=mailto:John.P.Lucas@ivv.nasa.gov><font size=1 color=blue face="Arial"><u>John.P.Lucas@ivv.nasa.gov</u></font></a><font size=1 face="Arial">></font><font size=3 face="Times New Roman">
</font><font size=1 color=#5f5f5f face="Arial"><br>
Date: </font><font size=1 face="Arial">01/03/2017
11:04</font><font size=3 face="Times New Roman"> </font><font size=1 color=#5f5f5f face="Arial"><br>
Subject: </font><font size=1 face="Arial">[Sls-sea-dls]
Question regarding the SDLS EP Standard</font><font size=3 face="Times New Roman">
</font><font size=1 color=#5f5f5f face="Arial"><br>
Sent by: </font><font size=1 face="Arial">"SLS-SEA-DLS"
<</font><a href="mailto:sls-sea-dls-bounces@mailman.ccsds.org"><font size=1 color=blue face="Arial"><u>sls-sea-dls-bounces@mailman.ccsds.org</u></font></a><font size=1 face="Arial">></font><font size=3 face="Times New Roman">
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<br>
Dear SDLS WG members,</font><font size=3 face="Times New Roman"> </font><font size=2 face="Arial"><br>
<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:</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
<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:</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
"Values 0-65535 shall not be used to reference session keys."</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
Which would be all possible Key IDs and leave none for any session keys.
Can you clarify?</font><font size=3 face="Times New Roman"> </font><font size=2 face="Arial"><br>
<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)?</font><font size=3 face="Times New Roman"> </font><font size=2 face="Arial"><br>
<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:
<br>
<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:</font><font size=3 face="Times New Roman"> </font><font size=2 face="Arial"><br>
GVCID = TFVN + SCID + VCID</font><font size=3 face="Times New Roman"> </font><font size=2 face="Arial"><br>
And the 2 bits long TFVN may have the following values: 01 -> AOS; 10
-> Proximity-1; 00 -> TM- *or* TC-SDLP</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
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.</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
<br>
Best Regards,</font><font size=3 face="Times New Roman"> </font><font size=2 face="Arial"><br>
David Koisser</font><font size=3 face="Times New Roman"> </font><font size=2 face="Courier New"><br>
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