From mboxrd@z Thu Jan  1 00:00:00 1970
From: dave@horsfall.org (Dave Horsfall)
Date: Mon, 5 Feb 2018 12:44:29 +1100 (EST)
Subject: [TUHS] Windows roots and Unix influence (was Re: Happy birthday,
 Ken Thompson!)
In-Reply-To: <2EDC8B25-60C9-408C-947C-64B219E9FA64@cheswick.com>
References: <CAEoi9W7CaiOeeFde0G3t+_siaHGtpQosH95weB=MxjzjT4SgHA@mail.gmail.com>
 <c5f4d136-c531-e37e-6695-14ce4648e660@gmail.com>
 <20180204091435.GA22841@indra.papnet.eu>
 <00d001d39ddc$a069a380$e13cea80$@ronnatalie.com>
 <CAEoi9W7Q8eAoWjGZHx2S9cYkU4hNYCGd9abs86QJEfcn5886BA@mail.gmail.com>
 <CAJfiPzzZoxw8VuE4eVKEHJ=WAHCpDrMgnrD4FKFagSg6a0aJ8Q@mail.gmail.com>
 <201802042059.w14KxBo3031103@darkstar.fourwinds.com>
 <2EDC8B25-60C9-408C-947C-64B219E9FA64@cheswick.com>
Message-ID: <alpine.BSF.2.21.1802051241050.50080@aneurin.horsfall.org>

On Sun, 4 Feb 2018, William Cheswick wrote:

> One important and sensitive site chose to stick with this technology for 
> a while becauseone could detect unauthorized taps.  I guess TDR isn’t as 
> useful these days.

I believe that optical TDRs exist, for use on fibre.  The ultimate in 
anti-snooping, of course, is quantum; if you so much as *look* at it, 
you've disturbed it (which is how quantum key exchange would work etc).

-- 
Dave Horsfall DTM (VK2KFU)  "Those who don't understand security will suffer."