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Proposed is a very simple NTP scheme. Without doing any
two-way handshake, any wireless devices that broadcast an
SSID would also broadcast the current time. Devices could be
configured to scan for these signals and set their own time
accordingly. Without a handshake, configuration would be as
simple as possible. Use cases would include wall clocks,
microwave ovens, ranges, desk clocks, media players,
televisions, etc. The apparent signal strength would be much
stronger than WWVB in the United States, possibly making
the radios cheaper in these devices.
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//would also broadcast the current time// |
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Or the *wrong* current time. |
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Hmm, I can see the issue here when some joker inserts one wifi device with the wrong time, and you get a cascade of "is it really 3am?". |
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Maybe require the wi-fi hub to only broadcast a time
if it was synchronised with a recognised NTP source
within a specified period, along the lines of "2013-08-
11 00:03:32 UTC from uk.pool.ntp.org 2 hours 35
minutes ago" |
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//any wireless devices that broadcast an SSID would also broadcast the current time// |
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"A man with a clock always knows what time it is. A man with two clocks is never sure." |
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//require the wi-fi hub to only broadcast a time if it was synchronised with a recognised NTP source// |
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History has shown that requiring other network nodes to be non-malicious is a fool's endeavour. |
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Have the devices get the time from the SSID with the strongest signal. In most cases that's will be the router owned by the person with the other device as well. |
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Sure, the system can be attacked, but if someone has the resources to broadcast a signal that will overpower all the local routers, they probably have better things to do than reset the time on a Microwave. |
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This sounds like it's intended for low cost devices, which should be non-critical applications. If I plugged in my microwave and it turned on with the correct time flashing, and I just hit the clock button to accept (of use the standard adjustments to set a different time), that would be very convieniet. |
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I pulled up the 802.11 spec, and there is already a "Time advertisement" and a "Time Zone" element. I'm not sure how often those gets used. If they are used, the device might be able to sniff for those, allowing this to work before updates get rolled out to all the routers. |
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