1. An apparatus comprising: one or more ring oscillators providing an initial random source; and a post-processing block comprising: a multiplexer comprising two data signal inputs, a control signal input, and an output, where the control signal input receives the initial random source; a finite field multiplication component comprising first and second inputs and an output, wherein the first input of the finite field multiplication component receives the output of the multiplexer; a finite field squaring component comprising an input and an output, wherein the output of the finite field squaring component is provided to the second input of the finite field multiplication component; and an accumulator comprising an input and an output, wherein the input of the accumulator receives the output of the finite field multiplication component, and the output of the accumulator is provided to both the input of the finite field squaring component, and to an output channel of the post processing block.