[aprssig] Secutiry for the aprs protocol and software

[Bill Diaz]

Bill,
	See below:

>-----Original Message-----
>From: aprssig-bounces at tapr.org 
>[mailto:aprssig-bounces at tapr.org] On Behalf Of William Gery
>Sent: Sunday, August 23, 2009 08:19
>To: TAPR APRS Mailing List
>Subject: [aprssig] Secutiry for the aprs protocol and software
>
>
>
>This is a follow up to a question posed about a month back. It 
>seems the
>NWS may be the first agency looking into APRS at this level.
>
>We need to answers a couple of questions and hope the this group can
>assist. APRS can provide  communications between the NWS,  spotters and
>EM/s. It also provides  good situation awareness for all. 
>
>Here are the questions we need answers.
>
>First, The APRS radio transmission. The APRS protocol as received by a
>TNC and software looks to be immune from accepting any thing but valid
>APRS packet. Are there can special precaution that should be taken ?

	Any invalid packets (CRC errors etc) will be rejected by a TNC if
PASSALL is set to OFF.  If PASSALL is set ON then invalid packets can be
received and be relayed etc.  Unfortunately, we do occasionally see invalid
packets showing up on the APRS-IS from mis-configured TNC's.

>Second,
>
>Both UI-View and Xastir permit radar data and also weather 
>warning to be
>displayed. This requires the APRS system to be connect to the Internet.


	The radar image data used by UiView/NWSGet is obtained from one or
more of the following: http://www.srh.noaa.gov/ridge/Conus/RadarImg
,http://radar.weather.gov/ridge/RadarImg/ ,
http://mesonet.agron.iastate.edu/GIS/data/gis/images/unproj/USCOMP/ ,
http://mesonet.tamu.edu/gemdata/images/radar/ 

>The data received from the Internet server is the APRS protocol.  Is
>there a way that this data stream could be compromised ?

	The WWA in APRS format received in the past from WxSvr are no longer
available.  Pete Loveall AE5PL is in the process of generating Warnings via
a new server application.  Watches and some other products previously
received from WxSvr apparently will not be supported on the new server.
Contact Pete directly for details at pete at ae5pl.net.

Bill KC9XG

>Based on the information we received we will be able to address the
>options and continue to use APRS to meet the NWS mission.  
>
>Thanks for your help
>
>Bill
>-- 
>William Gery - KA2FNK
>Office 816-268-3152
>
>
>Regional Systems Manager
>National Weather Service
>Central Region Headquarters
>7220 NW 101st Terrace
>Kansas City, MO 64153-2371
>
>
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