1. A method for monitoring an output of a random generator, comprising: sampling chronologically successive output values at each one of at least two sampling points of the random generator; wherein the random generator includes a ring oscillator which has an odd number of inverting elements; wherein the sampled chronologically successive output values are stored; wherein an odd number of inverting elements is present in each case in the ring oscillator between at least two directly successive sampling points; and comparing the sampled chronologically successive output values with one another in order to detect a relationship of the sampled values with one another.