Method and apparatus for true random number generation is described. One aspect of the invention relates to a digital logic circuit that includes N logic gates, where N is an integer greater than two. For each logic gate in the N logic gates: a first input terminal thereof is coupled to an output terminal thereof; a second input terminal thereof is coupled to an output terminal of a left neighbor thereof; and a third input terminal thereof is coupled to an output terminal of a right neighbor thereof. A sampling logic circuit may be provided to sample the output of the N logic gates to produce N-bit binary numbers. The N-bit binary numbers are true random numbers produced using pure digital logic without using an external source of randomness. A linear hybrid cellular automaton (LHCA) may be provided for scrambling output data of the sampling circuit.