[Cryptography] OpenPGP and trust

[Watson Ladd]

On Sat, Mar 29, 2014 at 6:57 PM, Dave Horsfall <dave at horsfall.org> wrote:
> On Sat, 29 Mar 2014, Stuart Longland wrote:
>
>> In Amateur Radio, encryption is more or less outlawed.  In the US, it's
>> not allowed on air, end of story (I hear much vigorous discussion about
>> it on the digitalvoice mailing list).  Here in Australia, it's allowed
>> for very specific circumstances, such as in emergency communications.
>> Regardless of your location, in most places it is frowned upon.
>
> Also for things like remote control of repeaters etc.  If some wombat
> started playing music over it (or worse), I merely commanded it off.
>
> Naturally I changed the key every so often, because the idiots regarded it
> as a challenge to decrypt my commands (I'd quickly learned to avoid replay
> attacks by using some sort of a rolling-key scheme), but strong crypto
> was, and still is, a definite no-no.

Aren't MACs okay? I believe the 2003 ARRL handbook explains that each
command to an OSCAR is suffixed with an authentication code to prevent
mischief.

Sincerely,
Watson Ladd
>
> -- Dave
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