Analyzing the delay of the output of a device can be used to gain knowledge about the design; one countermeasure used is to randomize the delays every time an operation is performed. How can this...

Analyzing the delay of the output of a device can be used to gain knowledge about the design; one countermeasure used is to randomize the delays every time an operation is performed. How can this random delay be implemented? What are the challenges that the designer may face when applying this countermeasure?