Patent ID: 9401802
Filing Date: 2016-07-26
CPC Classification: G09C,H04L

Claim Text:
1. A method of defending an electronic device against a side channel attack, the method comprising: receiving first one or more parameters at an authentication circuit of the electronic device for altering a clock signal of the electronic device at a non-volatile memory register; altering a frequency of the clock signal of the electronic device during execution of an authentication routine according to the first one or more parameters; receiving second one or more parameters for altering the clock signal of the electronic device at the authentication circuit; comparing the second one or more parameters to the first one or more parameters; resetting a count parameter of the non-volatile memory register if the second one or more parameters do not match the first one or more parameters; incrementing the count parameter of the non-volatile memory register if the second one or more parameters match the first one or more parameters; and shutting down a communication path of the electronic device if a value of the count parameter exceeds a threshold.