APRS-IS PassCode generation
You are correct Dave, the responsibility is on APRS-IS client
authors to do some level of validation that a passcode request is
from a licensed amateur radio operator. I am indebted to the
group admins for assisting me with this ongoing task. We field
probably 10 or more requests per week, sometimes less, sometimes
Rob, you are correct that the algorithm isn't complicated nor secret nor secure, but we work with what we're given.
Please do NOT publish links to APRS passcode sites. We know they exist, we know they're easy to find, but we don't condone their usage. That said, if someone asks you for a passcode and you KNOW they hold a current amateur radio license, feel free to use such a site to generate one for him/her.
But in the meantime, let's try to adhere to the specification at http://www.aprs-is.net/Connecting.aspx which says (emphasis their's):
passcode=computed passcode for your callsign. -1 is used for receive-only. It is the responsibility of each software author to provide the proper passcode to their individual users on a request basis. This is to aid in keeping APRS-IS restricted to amateur radio use only.
and further admits:
While the algorithm to generate the passcode is available from some open-source locations, I will not publish it here. If you are an Amateur Radio operator writing software for APRS-IS, contact me directly for the algorithm; otherwise, contact the software author for your passcode.
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and
On 9/16/2020 10:49 AM, David Shrum wrote: