Method and system of secure random seed generation for a cryptographically secure pseudo-random number generator

1. An information handling system, comprising:

a main processor;

a battery;

an embedded controller (EC) further comprising an EC processor; and

memory media accessible to the EC processor and storing instructions executable by the EC processor for:

determining a first cell voltage of the battery as a 16-bit value;

determining a second cell voltage of the battery as a 16-bit value;

concatenating the first cell voltage and the second cell voltage to obtain a cell voltage value as a 32-bit value;

determining a remaining battery capacity of the battery as a 16-bit value;

determining a battery voltage of the battery as a 16-bit value;

determining a relative state of charge (SOC) of the battery as a 32-bit value;

determining an absolute SOC of the battery as a 32-bit value;

performing an exclusive or (XOR) of the cell voltage value with the remaining battery capacity to generate a first value as a 32-bit value;

performing an XOR of the first value with the battery voltage to generate a second value as a 32-bit value;

performing an XOR of the relative SOC left-shifted by one bit with the absolute SOC to generate a third value as a 32-bit value;

shifting the third value to most significant bits of a 64-bit value to generate a fourth value; and

performing an XOR of the fourth value with the second value to generate a 64-bit secure random seed, wherein an entropy source for the secure random seed includes the battery.

2. The information handling system of claim 1 , wherein determining the first cell voltage further comprises:

obtaining a cell voltage in Volts from a measurement of the first cell; and

using least significant 16-bits of the cell voltage as the first cell voltage.

3. The information handling system of claim 1 , wherein determining the second cell voltage further comprises:

obtaining a cell voltage in Volts from a measurement of the second cell; and

using least significant 16-bits of the cell voltage as the second cell voltage.

4. The information handling system of claim 1 , wherein determining the remaining battery capacity further comprises:

obtaining a remaining battery capacity value in milliwatt hours from a measurement of the battery; and

using least significant 16-bits of the remaining battery capacity value as the remaining battery capacity.

5. The information handling system of claim 1 , wherein determining the battery voltage further comprises:

obtaining a battery voltage value in Volts from a measurement of the battery; and

using least significant 16-bits of the battery voltage value as the battery voltage.

6. A method for secure communication, the method comprising:

determining a first cell voltage of a battery of an information handling system as a 16-bit value;

determining a second cell voltage of the battery as a 16-bit value;

concatenating the first cell voltage and the second cell voltage to obtain a cell voltage value as a 32-bit value;

determining a remaining battery capacity of the battery as a 16-bit value;

determining a battery voltage of the battery as a 16-bit value;

determining a relative state of charge (SOC) of the battery as a 32-bit value;

determining an absolute SOC of the battery as a 32-bit value;

performing an exclusive or (XOR) of the cell voltage value with the remaining battery capacity to generate a first value as a 32-bit value;

performing an XOR of the first value with the battery voltage to generate a second value as a 32-bit value;

performing an XOR of the relative SOC left-shifted by one bit with the absolute SOC to generate a third value as a 32-bit value;

shifting the third value to most significant bits of a 64-bit value to generate a fourth value;

performing an XOR of the fourth value with the second value to generate a 64-bit secure random seed, wherein an entropy source for the secure random seed includes the battery;

inputting the secure random seed to a pseudo-random number generator to generate a 64-bit pseudorandom bit stream;

generating an encryption key using the 64-bit pseudo-random bit stream as an input; and

using the encryption key to encrypt a network communication sent by the information handling system.

7. The method of claim 6 , wherein determining the first cell voltage further comprises:

obtaining a cell voltage in Volts from a measurement of the first cell; and

using least significant 16-bits of the cell voltage as the first cell voltage.

8. The method of claim 6 , wherein determining the second cell voltage further comprises:

obtaining a cell voltage in Volts from a measurement of the second cell; and

using least significant 16-bits of the cell voltage as the second cell voltage.

9. The method of claim 6 , wherein determining the remaining battery capacity further comprises:

obtaining a remaining battery capacity value in milliwatt hours from a measurement of the battery; and

using least significant 16-bits of the remaining battery capacity value as the remaining battery capacity.

10. The method of claim 6 , wherein determining the battery voltage further comprises:

obtaining a battery voltage value in Volts from a measurement of the battery; and

using least significant 16-bits of the battery voltage value as the battery voltage.

11. Non-transitory computer readable memory media storing instructions executable by a processor for:

determining a first cell voltage of a battery of an information handling system as a 16-bit value;

determining a second cell voltage of the battery as a 16-bit value;

concatenating the first cell voltage and the second cell voltage to obtain a cell voltage value as a 32-bit value;

determining a remaining battery capacity of the battery as a 16-bit value;

determining a battery voltage of the battery as a 16-bit value;

determining a relative state of charge (SOC) of the battery as a 32-bit value;

determining an absolute SOC of the battery as a 32-bit value;

performing an exclusive or (XOR) of the cell voltage value with the remaining battery capacity to generate a first value as a 32-bit value;

performing an XOR of the first value with the battery voltage to generate a second value as a 32-bit value;

performing an XOR of the relative SOC left-shifted by one bit with the absolute SOC to generate a third value as a 32-bit value;

shifting the third value to most significant bits of a 64-bit value to generate a fourth value; and

performing an XOR of the fourth value with the second value to generate a 64-bit secure random seed, wherein an entropy source for the secure random seed includes the battery.

12. The memory media of claim 1 , wherein determining the first cell voltage further comprises:

obtaining a cell voltage in Volts from a measurement of the first cell; and

using least significant 16-bits of the cell voltage as the first cell voltage.

13. The memory media of claim 11 , wherein determining the second cell voltage further comprises:

obtaining a cell voltage in Volts from a measurement of the second cell; and

using least significant 16-bits of the cell voltage as the second cell voltage.

14. The memory media of claim 11 , wherein determining the remaining battery capacity further comprises:

obtaining a remaining battery capacity value in milliwatt hours from a measurement of the battery; and

using least significant 16-bits of the remaining battery capacity value as the remaining battery capacity.

15. The memory media of claim 11 , wherein determining the battery voltage further comprises:

obtaining a battery voltage value in Volts from a measurement of the battery; and

using least significant 16-bits of the battery voltage value as the battery voltage.

16. The memory media of claim 11 , wherein the processor is an embedded controller processor in an information handling system that further comprises a main processor.