International Civil Aviation Organization working paper



International Civil Aviation Organization WORKING PAPER

ACP-WGM16/WP-13 17 May 2010

Agenda Item 3a:

ATN/OSI Document 9880 Update Status – Security Updates

Amendment Proposal

for

Compressed Certificates in Doc 9880

Prepared by: FAA

1. 
   INTRODUCTION
   
   1. 
      One of recommendations of the Honeywell Validation Report is to remove Compressed Certificates from Doc 9880.
      
2. 
   discussion
   
   1. 
      This AP proposes using the Spec 42 Certificate profile for the format and content of Compressed Certificates but PER encode them over the air-ground link.
      
   2. 
      The Honeywell Validation Report recommended removing compressed certificates. The rational for the recommendation is that certain constraints on ATN compressed certificates would prevent them from being generated by commercial Certificate Authorities. The key constraint is that Doc 9880 specifies that extension fields appear in a particular order, which is not an industry standard practice.
      
   3. 
      The Honeywell Validation Report also recommended that Doc 9880 be updated to use a mechanism in ACARS Message Security (AMS) whereby an aircraft only requests a ground certificate if it does not already have a valid certificate.
      
   4. 
      Section 4.3.2 of Doc 9880 specifies the format and allowed content in each field of an ATN Compressed Certificate.
      

Replace section 4.3.2.1 with the following:

4.3.2.1 Encoding and Syntax of Compressed Certificates

4.3.2.1.1 Compressed ATN Certificates shall be Uncompressed ATN Certificates (reference 4.3.1) that are encoded using the basic aligned variant of the Packed Encoding Rules (PER) as specified in ISO/IEC 8825-2.

Remove the remaining sections of 4.3.2

3. 
   ACTION BY the meeting
   
   1. 
      The ACP WG-M is invited to:
      

1. 
   Review the revisions to Doc 9880 identified by the AP in this Working Paper and provide comments and feedback regarding the proposed changes as described.
   

2. 
   Because it results in bandwidth savings with PER encoded certificates, the FAA recommends acceptance of these changes and requests endorsement by the Working Group to update Doc 9880 as described in the AP.
   
3. 
   With respect to the Honeywell recommendation for the aircraft to signal whether or not it already has a valid certificate, the FAA recommends that this be considered along with the proposal to implement ATN Security in a Secure Dialogue Service or as a separate AP.
   

Directory: safety -> acp -> ACPWGF -> ACP-WG-M-16
ACPWGF -> Working paper
ACPWGF -> Amcp wgm/WP19 19 August 2002 Aeronautical Mobile Communication Panel (amcp) Working Group-m meeting Fifth Meeting Saint Petersburg, Russia, 19 to 23 August 2002 Agenda Item 4: satcom
ACPWGF -> Acp wgf/16 wp 27 Rev. 1 International Civil Aviation Organization
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ACPWGF -> Working paper
ACPWGF -> Airborne collision avoidance systems working group-a
ACPWGF -> Working paper
ACP-WG-M-16 -> International Civil Aviation Organization working paper
ACP-WG-M-16 -> International Civil Aviation Organization working paper

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