Randomizing current injection circuit to obscure gate noise for added security

摘要

A circuit for obscuring gate switching noise includes a synchronous clock source; an asynchronous clock source; at least one current source; and a random number generating circuit for receiving clock inputs from the synchronous clock source and the asynchronous clock source, the random number generating circuit generating randomly changing asynchronous digital control signals for controlling the current source.

主权项

1. A circuit for obscuring gate switching noise, comprising:
a synchronous clock source; an asynchronous clock source; a plurality of current sources; a random number generating circuit receiving clock inputs from the synchronous clock source and the asynchronous clock source, the random number generating circuit generating randomly changing asynchronous digital control signals, and a bitstream buffer receiving the asynchronous digital control signals and controlling an amplitude of current from the plurality of current sources, wherein the bitstream buffer comprises an input and a plurality of outputs, wherein each output has a predefined offset with respect to a stored bitstream and wherein each current source is coupled with a different one of said plurality of outputs.