Here’s an open source random bit generator, source and schematic included… Link.
4 thoughts on “ORB – Open random bit generator”
Comments are closed.
ORB – Open random bit generator
Here’s an open source random bit generator, source and schematic included… Link.
Comments are closed.
A pity they use an old type of chip. The newer 12F675 could be used as well, and it’s easier to find.
I think I will use this in my next project — I want to do stuff with randomness, and I found a schematic with a few transistors that has to run on 12V. This works on 5V (just like the rest of the schematic) and has a lower pincount (and thus a smaller footprint).
Hey, that’s really similar to the technique I use on the Daisy kit. The ORB probably creates more crypto-friendly results, but the idea is the same. I use noise from the LSB of the AD converter and some “whitening” routines, but no external resistor. Interesting articles on wikipedia: http://en.wikipedia.org/wiki/Whitening