[Cryptography] [FORGED] Re: Escrowing keys

Benjamin Kreuter brk7bx at virginia.edu
Thu May 4 03:00:28 EDT 2017

On Tue, 2017-05-02 at 19:10 -0400, Viktor Dukhovni wrote:
> > On May 2, 2017, at 2:50 PM, Phillip Hallam-Baker <phill at hallambaker
> > .com> wrote:
> > 
> > It isn't really the case that control systems were expected to last
> > a hundred years.
> > Most would be ripped out and replaced on a regular basis.
> https://www.nytimes.com/2017/05/01/nyregion/new-york-subway-signals.h
> tml
>    On a recent evening, Mr. Habersham walked along the train tracks
> near 34th Street
>    in Manhattan as workers replaced antiquated switches and cables. A
> signal system
>    should last about 50 years, he said, but the one that guides
> trains through this
>    slice of Manhattan has been in place for about 80.

That is not quite right; while the design of that equipment is decades
old, most of the parts have to be replaced periodically.  Those
machines are electromechanical and they have all the failures one would
expect of gears, levers, and vacuum tube relays.

-- Ben
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