ENTROPY SOURCE CIRCUIT AND ENTROPY VALUE GENERATION METHOD
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United States of America Patent
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Issued Date -
Feb 29, 2024
app pub date -
Jul 6, 2023
filing date -
Aug 26, 2022
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Abstract
An entropy source circuit, comprising: a first adjustable ring oscillator for operating under a first setting or a second setting according to a first control signal, for respectively generating a first oscillation clock signal and a second oscillation clock signal which have different frequencies under the first setting and the second setting; a first sampling circuit, for sampling the first oscillating clock signal according to the sampling frequency to generate first sampling values, or sampling the second oscillating clock signal according to the sampling frequency to generate second sampling values; a first detection circuit detecting a first distribution of the first sampling values; and a control circuit generating the first control signal to switch the first setting to the second setting when the first distribution does not meet a predetermined distribution. The entropy source circuit outputs entropy values according to the first sample value or the second sample value.
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