After reading all of the replies, no one mentioned how to use iPhone to detect the light changes (bright and dark) in codes, I just have no clue how to make it works as long as I remember developers have no right to access the light sensor, so I guess we have to use camera to achieve this, but I just don't know how. Can anyone point me to something to read so I can start digging into this and make the whole thing start to work?
Thank you all. On Fri, 18 Sep 2015 at 20:38 Michael David Crawford <mdcrawf...@gmail.com> wrote: > Do iOS devices support Trusted Computing in hardware? If so is it > accessible to userspace apps? > > If so, you could store your phones secret in a write-only register. > For the profoundly paranoid, even the duplication of your storage > would not yield your phone's secret, The Bad Guy would need your > personal phone. > > Modern Macs - to the best of my knowledge - provide trusted computing > chips, on can access them from userspace with a modest bit of code. > Michael David Crawford P.E., Consulting Process Architect > mdcrawf...@gmail.com > http://mike.soggywizard.com/ > > One Must Not Trifle With Wizards For It Makes Us Soggy And Hard To > Light. > > > On Fri, Sep 18, 2015 at 3:12 AM, Maxthon Chan <m...@maxchan.info> wrote: > > The "over-the-shoulder" issue can be avoided using what is effectively a > Diffie-Hellman on top of QR codes. This can be done using front-facing > cameras on two devices placed face-to-face. > > > > Sent from my iPhone > > > >> On Sep 18, 2015, at 00:46, Pascal J. Bourguignon <p...@informatimago.com> > wrote: > >> > >> > >> > >>> On 17/09/15 17:32, Michael David Crawford wrote: > >>> And what the man said: I myself experience seizures in which I lose > >>> consciousness for as long as three weeks. Before they were diagnosed > >>> I would experience seizures while driving my car then suddenly find > >>> myself in unfamiliar places without any clue how I got there. > >>> > >>> I don't know for sure but strongly suspect that modern computer user > >>> interfaces caused my seizure disorder as well as that of my cousin. > >>> Seizures are not otherwise found among any of our blood relatives. > >> > >> But then if you don't use the whole screen, but only the area that > >> should be in front of the camera of the superposed phone, then users > >> shouldn't be subjected to much stroboscopic light. > >> > >> Having the objective so close from the light source does not allow > >> the camera to distinguish pixels; for example, a black to white > >> transition takes about 1/10 of the height of the camera view. > >> But this means that you might still able to transmit about ten pixels > at once, > >> and you can multiply that by a number of color that you can detect > reliably > >> being that out of focus. Basically, I would expect 8 colors to be > clearly > >> distinguishable. Actually, probably more colors should be > distinguishable, > >> if you can filter out the interferences due to the grid of the camera > vs. > >> the grid of the screen. So assume 4 bits for the color, and 9 areas, > >> that's 36 bit/moment, and you should be able to do 30 moment/second, > >> for a total of 1080 bit/second. A little less for ECC, about 1 KB/s > >> is not too bad. It's good enough to transmit a good private key, and > then > >> transfer the data thru wifi. > >> > >> > >> Of course, if you move the camera out to focus on the screen, then > >> you can transmit at a higher speed things like QR codes, but they > >> could also be seen over the shoulder by high resolution cameras. > >> > >> -- > >> __Pascal J. Bourguignon__ > >> http://www.informatimago.com/ > >> > >> _______________________________________________ > >> > >> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > >> > >> Please do not post admin requests or moderator comments to the list. > >> Contact the moderators at cocoa-dev-admins(at)lists.apple.com > >> > >> Help/Unsubscribe/Update your Subscription: > >> https://lists.apple.com/mailman/options/cocoa-dev/max%40maxchan.info > >> > >> This email sent to m...@maxchan.info > > > > _______________________________________________ > > > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > > > Please do not post admin requests or moderator comments to the list. > > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > > > Help/Unsubscribe/Update your Subscription: > > https://lists.apple.com/mailman/options/cocoa-dev/mdcrawford%40gmail.com > > > > This email sent to mdcrawf...@gmail.com > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/cocoa-dev/jche128%40gmail.com > > This email sent to jche...@gmail.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
