According to some embodiments, the transmission of the random signal values over the signal transmission lines of the first metallic layer 11 and the second metallic layer 13 may be performed at each rising edge of the system clock. In such embodiments, the random number generator 15 may be configured to update the random signal values to be transmitted to the transmitter manager 17 and the receiver manager 19 at each rising edge of the system clock. Upon receiving the updated random signal values, the transmitter manager 17 may be configured to transmit the updated random signal values at the rising edge of the system clock over the signal transmission lines of the first metallic layer 11 and the second metallic layer 13. The receiver manager 19 may be configured to receive the updated random signal values during the rising edge of the system clock from the random number generator 15, to store the updated random signal values, and to initialize a counter at each rising edge of the system clock.

According to some embodiments in which the transmission time required for transmitting the random signal values is less than or equal to one system clock cycle, the receiver manager 19 may use an internal clock with a frequency higher than the frequency of the system clock to define the timing interval I=[t₀, t₁] represented by a first threshold t₀ and a second threshold t₁ and defined, in such embodiments, by the number of internal clock cycles needed to transmit the random signal values through the signal transmission lines.

When using an internal clock cycle for measuring the signals transmission time, the receiver manager 19 may be configured, at each rising edge of the internal clock, to: