[Cryptography] How to crypto secure speed limit signs
ashwood at msn.com
Wed Mar 25 18:37:55 EDT 2015
Subject: Re: [Cryptography] How to crypto secure speed limit signs
> The only thing that makes sense IMHO is a good GPS and signed official map
> data kept
> frequently updated.
That is of course the actual correct solution. The frequent updates aren't
even a problem, an increasing number of new cars come with their own data
connection. Today the connection is used to unlock your car via cell phone,
there's not reason it can't be used to update not just the speed limits but
all the road advisories in the internal database.
The cost of updating a central database is tiny. The cost of making diff
files is tiny. The cost of distributing these diff files is small but not
tiny, done properly even at typical cloud data costs less than $1 per year
per vehicle, easily absorbed into the registration cost.
This gets rid of a real problem. The cost of the signs. The signs can now be
taken down. This reduces infrastructure cost, reduces environmental impact.
Reduces maintenance costs. Reduces visible intrusions. Eliminates sign
theft. And of course, the signs in place can simply be left in place. This
also works under the implied speed limits that Darren noted (they'd no
longer be implied but explicit in the database).
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