On 7/7/14 12:43 AM, sam tygier wrote:
I suggest that something similar is done with the database download, by
only giving weak information about each hotspot. For example either its
latitude or longitude (depending on something deterministic such as the
last bit of the BSSID). Now an individual hotspot can't be located, but
a group known to be close together can. There are a few alternatives,
for example a hot spot could either be coarse (integer part of
coordinates) or fine (fractional part of coordinates), but I am not sure
this is any better.
That's an interesting idea because it sounds like knowing just one
hotspot might still be useful.
I posted a similar idea for combining data from multiple neighboring
hotspots to unlock the offline data (by hashing two or more BSSIDs
together):
https://groups.google.com/forum/#!msg/mozilla.dev.security/0qT0grS_PIY/mqMLlh9uyG4J
The conclusion there was that my proposal was very complicated and
either provided unnecessary privacy (for hotspot owners) or not enough.
So there was more of a philosophical/legal roadblock about privacy than
a technical one. :)
chris
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