Re: I am going to build a true random number generator ...
how about making a deal with farmers. A couple of RasPi or Arduino and some IR detectors. Have them placed near those gigantic industrial chicken coop. their head movement would cut the beam and the timing would generate the data.
Not safe. A clever attacker will hide a kinect in there and figure out your numbers. Nevertheless, it would certainly be the funniest RNG ever invented
There are ways to use securely use random numbers which are (or may be) known by other parties. A simplistic option would be to XOR the random values with a large constant. A more sophisticated option is to use something like HMAC with a private key only known to you to produce new numbers from the existing known stream.
your_random_number = HMAC_SHA256(, )
Still not sure the CRNG (chicken random number generator) would be uniformly distributed.