Generating a random number in an existing system on chip

A method of generating a true random number utilizing a system on chip (SOC), the method comprising:

• providing a SOC having a plurality of sub circuitry synchronous modules, each of the plurality of sub circuitry synchronous modules being configured to operate in a respective nominal clock rate, wherein each of, the plurality of sub circuitry synchronous modules exhibit process invariance and yield expected deterministic results while operating in the nominal clock rate;
• clocking one or more sub circuitry synchronous modules in a clock rate substantially higher than its respective nominal clock rate to yield a non deterministic behavior of the at least one sub circuitry synchronous module, due to process variance, resulting in at least one random number;
• and
• applying a hash function on the at least one random number thereby generating a number exhibiting a high level of randomness.