Patent ID: 7734672

Claim:
A circuit to check a bit flow derived from a noise source, the circuit comprising: at least one first normalization circuit to change at least one value of the bit flow provided by the noise source, and to output a first modified output flow; at least one second normalization circuit to change at least one value of the bit flow and to output a second modified output flow different from the first modified output flow; means for pairing, bit to bit, the first modified output flow and the second modified output flow to provide a plurality of bit pairs, each bit pair formed of one bit of the first modified output flow and one bit of the second modified output flow; and means for checking an equidistribution of multiple possible states of the plurality of bit pairs, and providing an indication of an equiprobable distribution of the first modified output flow and the second modified output flow based on the equidistribution of the multiple possible states.