[Sls-sea-dls] Fw: Question regarding the SDLS EP Standard
Gian.Paolo.Calzolari at esa.int
Gian.Paolo.Calzolari at esa.int
Wed Apr 12 09:04:15 UTC 2017
Daniel,
SLP is not meeting on Wednesday and I think they have a priority
for USLP discussion on Thursday.
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.
Moreover Wednesday afternoon some SLP members will be attending the DTN
meeting.
You may want to investigate who could attend it Friday AM to see if there
is a kind of quorum.
Just my cent....
Gian Paolo
From: Daniel Fischer/esoc/ESA
To: Gian Paolo Calzolari/esoc/ESA at ESA
Cc: "Greenberg, Edward (312B)" <edward.greenberg at jpl.nasa.gov>, "Moury
Gilles" <Gilles.Moury at cnes.fr>, "Kazz, Greg J (312B)"
<greg.j.kazz at jpl.nasa.gov>, "sls-sea-dls at mailman.ccsds.org"
<sls-sea-dls at mailman.ccsds.org>
Date: 12/04/2017 07:15
Subject: Re: [Sls-sea-dls] Fw: Question regarding the SDLS EP
Standard
Dear all,
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.
Cheers,
Daniel
Dr. Daniel Fischer
Head of the Engineering Support Section, OPS-GES
Ground Systems Engineering Department
Directorate of Operations
ESA - ESOC
Robert-Bosch-Str. 5, D-64392 Darmstadt, Germany
Tel. +49 6151 90 2718 | E-mail: Daniel.Fischer at esa.int
From: Gian Paolo Calzolari/esoc/ESA
To: "Kazz, Greg J (312B)" <greg.j.kazz at jpl.nasa.gov>
Cc: "Moury Gilles" <Gilles.Moury at cnes.fr>, Daniel
Fischer/esoc/ESA at ESA, "Greenberg, Edward (312B)"
<edward.greenberg at jpl.nasa.gov>, "sls-sea-dls at mailman.ccsds.org"
<sls-sea-dls at mailman.ccsds.org>
Date: 11/04/2017 19:32
Subject: Re: [Sls-sea-dls] Fw: Question regarding the SDLS EP
Standard
If you do that first thing on friday am somebody from sdls may be able to
attend too.
Sent from my iPhone
On 11 Apr 2017, at 18:37, Kazz, Greg J (312B) <greg.j.kazz at jpl.nasa.gov>
wrote:
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.
However, we don?t have a SLS area joint meeting scheduled in San Antonio.
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.
G.P. ? what do you think?
Thanks!
Greg
From: Moury Gilles <Gilles.Moury at cnes.fr>
Date: Tuesday, April 11, 2017 at 4:08 AM
To: "Daniel.Fischer at esa.int" <Daniel.Fischer at esa.int>, "Greenberg, Edward
(312B)" <edward.greenberg at jpl.nasa.gov>
Cc: Greg Kazz <greg.j.kazz at jpl.nasa.gov>, "sls-sea-dls at mailman.ccsds.org"
<sls-sea-dls at mailman.ccsds.org>, Calzolari Gian-Paolo <
Gian.Paolo.Calzolari at esa.int>
Subject: RE: [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard
Dear Ed,
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 ?
Best regards,
Gilles
Gilles MOURY
CNES Toulouse
De : Daniel.Fischer at esa.int [mailto:Daniel.Fischer at esa.int]
Envoyé : mardi 11 avril 2017 12:32
À : Greenberg, Edward (312B)
Cc : Moury Gilles; Kazz, Greg J (312B); sls-sea-dls at mailman.ccsds.org
Objet : RE: [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard
Dear Ed,
Sorry for not coming back to you earlier. I think we will discuss your
recommendation in the upcoming meetings.
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.
Cheers,
Daniel
Dr. Daniel Fischer
Head of the Engineering Support Section, OPS-GES
Ground Systems Engineering Department
Directorate of Operations
ESA - ESOC
Robert-Bosch-Str. 5, D-64392 Darmstadt, Germany
Tel. +49 6151 90 2718 | E-mail: Daniel.Fischer at esa.int
From: "Greenberg, Edward (312B)" <edward.greenberg at jpl.nasa.gov>
To: Moury Gilles <Gilles.Moury at cnes.fr>, "Daniel.Fischer at esa.int" <
Daniel.Fischer at esa.int>, "sls-sea-dls at mailman.ccsds.org" <
sls-sea-dls at mailman.ccsds.org>
Cc: "Kazz, Greg J (312B)" <greg.j.kazz at jpl.nasa.gov>
Date: 11/04/2017 01:36
Subject: RE: [Sls-sea-dls] Fw: Question regarding the SDLS EP
Standard
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?.
From: Greenberg, Edward (312B)
Sent: Friday, March 31, 2017 2:24 PM
To: 'Moury Gilles'; Daniel.Fischer at esa.int; sls-sea-dls at mailman.ccsds.org
Subject: RE: [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard
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.
From: SLS-SEA-DLS [mailto:sls-sea-dls-bounces at mailman.ccsds.org] On Behalf
Of Moury Gilles
Sent: Friday, March 31, 2017 2:00 AM
To: Daniel.Fischer at esa.int; sls-sea-dls at mailman.ccsds.org
Subject: Re: [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard
Dear all,
My response to David?s questions would be :
Q1 : values 0 and 65535 are reserved (for master keys I understand). Text
should be modified.
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.
Q3 : My proposal would be the following:
· 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 TFVN (4 bits)
o SCID (16 bits)
o VCID (6 bits)
o MAPID (6bits)
· 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).
Best regards,
Gilles
Gilles MOURY
CNES Toulouse
De : SLS-SEA-DLS [mailto:sls-sea-dls-bounces at mailman.ccsds.org] De la part
de Daniel.Fischer at esa.int
Envoyé : vendredi 31 mars 2017 08:57
À : sls-sea-dls at mailman.ccsds.org
Objet : [Sls-sea-dls] Fw: Question regarding the SDLS EP Standard
Dear all,
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.
My take:
Q1 is a typo and will be corrected. --> No further discussion needed
Q2: This should be the case. What do the others think? Do we need to be
explicit there?
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?
Cheers,
Daniel.
Dr. Daniel Fischer
Head of the Engineering Support Section, OPS-GES
Ground Systems Engineering Department
Directorate of Operations
ESA - ESOC
Robert-Bosch-Str. 5, D-64392 Darmstadt, Germany
Tel. +49 6151 90 2718 | E-mail: Daniel.Fischer at esa.int
----- Forwarded by Daniel Fischer/esoc/ESA on 31/03/2017 08:51 -----
From: David.Koisser at esa.int
To: sls-sea-dls at mailman.ccsds.org
Cc: "John P. Lucas" <John.P.Lucas at ivv.nasa.gov>
Date: 01/03/2017 11:04
Subject: [Sls-sea-dls] Question regarding the SDLS EP Standard
Sent by: "SLS-SEA-DLS" <sls-sea-dls-bounces at mailman.ccsds.org>
Dear SDLS WG members,
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:
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:
"Values 0-65535 shall not be used to reference session keys."
Which would be all possible Key IDs and leave none for any session keys.
Can you clarify?
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)?
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:
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:
GVCID = TFVN + SCID + VCID
And the 2 bits long TFVN may have the following values: 01 -> AOS; 10 ->
Proximity-1; 00 -> TM- *or* TC-SDLP
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.
Best Regards,
David Koisser
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