Abstract: The invention relates to devices for generating true random numbers, comprising a digital chaotically oscillating autonomous Boolean network as a source of entropy. According to the invention, the proposed digital chaotically oscillating autonomous Boolean network consists in three logic elements connected to each other, two of which represent two-input “Exclusive OR” and/or “Exclusive NOR” gates, and the third logic element has three inputs and one output, and implements a logic “counting ones” function, in which its output is set to a logic one if a logic one is present at no more than one of its inputs, otherwise it is set to a logic zero. The achieved technical result consists in an increase in true random number generation rate while decreasing energy consumption.