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Re: [HAM-AG] [IPv6] Request for feedback: draft-evan-amateur-radio-ipv6

Nick Harper <nharper@nharper.org> Thu, 16 February 2023 00:10 UTC

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From: Nick Harper <nharper@nharper.org>
Date: Wed, 15 Feb 2023 16:10:11 -0800
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To: Donald Eastlake <d3e3e3@gmail.com>
Cc: Evan Pratten <ewpratten@gmail.com>, Alexandre Petrescu <alexandre.petrescu@gmail.com>, IPv6 <ipv6@ietf.org>, ham-ag@ietf.org
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Subject: Re: [HAM-AG] [IPv6] Request for feedback: draft-evan-amateur-radio-ipv6
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Why hash the callsign at all?

Article 19 of ITU's Radio Regulations specifies the format of callsigns,
and they are at most 7 characters long. The ASCII representation of the
callsign could be used to generate 7 bytes (56 bits) to use in the address
without needing any hashing. For the exception in 19.68A (on special
occasions, for temporary use, callsigns could be longer than 7 characters),
a 6-bit encoding scheme could be devised so that alphanumeric callsigns up
to 10 characters long could be encoded in 60 bits.

On Wed, Feb 15, 2023 at 3:28 PM Donald Eastlake <d3e3e3@gmail.com> wrote:

> Hi,
>
> On Wed, Feb 15, 2023 at 3:03 PM Evan Pratten <ewpratten@gmail.com> wrote:
> >
> > On Wed, Feb 15, 2023 at 2:58 PM Donald Eastlake <d3e3e3@gmail.com>
> wrote:
> > > I'm not sure the hash even needs to be cryptographic.
> >
> > Agreed. I would call a cryptographic hash *undesierable*. Why waste
> > processing power hiding the callsign when you have to ID yourself
> > anyways?
> >
> > I am admittedly far from an expert on hashing algorithms. Donald, do
> > you have any suggestions that fit the properties you outlined by
> > chance?
>
> Indeed, I would suggest using FNV-64 truncated to the top 60 bits, See
> https://datatracker.ietf.org/doc/draft-eastlake-fnv/
>
> Here is an article on using FNV-32 for IPv6 flow label
>
> https://researchspace.auckland.ac.nz/bitstream/handle/2292/13240/flowhashRep.pdf
>
> Thanks,
> Donald
> =============================
>  Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
>  2386 Panoramic Circle, Apopka, FL 32703 USA
>  d3e3e3@gmail.com
>
> --
> HAM-AG mailing list
> HAM-AG@ietf.org
> https://www.ietf.org/mailman/listinfo/ham-ag
>

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