1. A hardware countermeasure for a cryptographic hardware module of a computing device, the hardware countermeasure comprising: a noise-sample generator, wherein the noise-sample generator is operable to accept as input data samples to be processed by the cryptographic hardware module and to generate as output a noise-sample for each of the input data samples, and wherein the noise-sample is associated with a power level; and, a distributed buffer network co-located with the cryptographic module, wherein the distributed buffer network is operable to accept as input the noise-samples and to emit, for each of the noise-samples, a noise output proportional in power to the power level associated with that noise-sample.