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Comment This app probably uses predictive analytics (Score 1) 28

With a history of actual travel times and delays the app probably does an "educated guess" ie predictive analytics to find the best combo of bus/subway/walking to get to your destination. When I was in high school I had about 4 choices for each direction, each taking about 45 minutes without delays or outages; this app would have been useful.

Comment But can FB reconstruct a hashed photo? (Score 2) 302

TFA says FB will hash an image and then delete the original. But to implement a similarity metric with previous "hashed" images of the same person, they will need a distance function that works on hashed values of all the photo's features that they capture. Unless they have conquered homomorphic encryption, FB will likely need to reverse the hashed features and then do similarity measures with previous photos, and will also be able to reconstruct "deleted" photos.

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