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Re: Criticize my tamper-proof paper wallet design... and steal 0.1 BTC if you can.
by
413j0
on 26/09/2013, 23:07:11 UTC
now candle it from the front, so the dispersion off the front obscuring pattern's light works in your favor, and if you did it correctly any part off the qr that touches the back obscuring pattern should be visible, but any part that is'n touching it should still scatter.

before photographing make sure to press gently on the white surface on the back so all the qr touches the pattern and therefore becomes clear.

in this step i can confirm that a cellphone light in a dark room is enough to make it perfectly clear to the human eye, so a good camera should be able to clearly pick it up.

since i was already using duck tape, i though about using it to obscure qr, so i did this:
http://img833.imageshack.us/img833/7286/icj1.jpg

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http://img94.imageshack.us/img94/5910/hz58.jpg

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http://img163.imageshack.us/img163/7352/hmn0.jpg

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http://img850.imageshack.us/img850/7707/afoe.jpg

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[IMG=http://img5.imageshack.us/img5/3336/38ki.jpg]http://[/img]

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http://img833.imageshack.us/img833/1733/hcb2.jpg

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http://img28.imageshack.us/img28/1976/8ui2.jpg

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but still wasn't enoug, because upon retriing one off my previos attemps at candling i used this old beast:
http://img34.imageshack.us/img34/6111/917x.jpg

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note: this thing actually can lift again a small piece off tinfoil falling towards it when it fires

and actually i got the best picture i have been able to get from this particular flash on my phones camera:
http://img819.imageshack.us/img819/5563/58p2.jpg

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if you notice the black shadow at right it's because this flash is faster than my cameras frame rate (60fps) and i couldn't light the whole frame, so under this conditions it's imposible to get my cellphone to focus or at least get any detail at all

proposed solution at next post....