Forming cryptograpy from wire, transister and ring ossilator delays is a far cry from the actual physical flash memory block defects...

http://verayo.com/pdf/2007_PUF_dac.pdf

Their website says they have multiple contracts and they're in 50 million chips, but how does that account for this -
http://www.manta.com/c/mt45332/verayo-inc

Wish you'd presented it without the FUD, would been welcome input.

emit...