Re:NeuG USB True Random Number Generator
by cleeus on Friday January 05, 2018 @01:26PM
(#16080479)
It's not that simple.
Some years ago I used an analog TV card tuned to an empty channel that was giving seemingly white noise and captured frames to generate entropy. I only used the least significant bit of each RGB value of each pixel.
When I supplied the bits to the diehard testsuite, it complained about a number of patterns and failing tests.
The hash function will of course save you, but it's hard to tell the amount of real randomness that's coming from the sensor.
update: Oh, I may have misunderstood. If the whole images changes in random ways and is secret, then of course this is fine.
Some years ago I used an analog TV card tuned to an empty channel that was giving seemingly white noise and captured frames to generate entropy. I only used the least significant bit of each RGB value of each pixel.
When I supplied the bits to the diehard testsuite, it complained about a number of patterns and failing tests.
The hash function will of course save you, but it's hard to tell the amount of real randomness that's coming from the sensor.
update: Oh, I may have misunderstood. If the whole images changes in random ways and is secret, then of course this is fine.