INTERFERENCE DETECTING RING OSCILLATORS

A system (100) for providing security in a computer system (110) is provided. The system includes a plurality of ring oscillators (102) and one or more logic circuits (101, 103, 104, 105). The ring oscillators are equipped with a respective plurality of counters (not shown) to count impulses of oscillating outputs of the ring oscillators. The one or more logic circuits (101, 13, 104, 105) start (enable) and stop (clear) the respective plurality of counters over repeated counting periods, and select (103) a group of ring oscillators from the plurality of ring oscillators (102). The one or more logic circuits (104) also determine a correlation between oscillating outputs of the group of ring oscillators. The one or more logic circuits (105) further generate a notification indicating interference in the group of ring oscillators (102) and thereby the plurality of ring oscillators when the correlation is above a predefined threshold correlation.