Methods for signal-embedded signatures

1. A method for a health scanning system, the method comprising:

receiving at least one electrical physiological data signal (PDS);

suppressing a direct current (DC) signal component of the PDS to emphasize an alternating current (AC) signal component of the PDS;

isolating a signal noise in the AC signal component of the PDS;

extracting a noise signature from the signal noise in the PDS;

comparing the noise signature to a predetermined signature; and

in response to determining a match between the noise signature and the predetermined signature, allowing access to at least one of a secured system, a device, and a database.

2. The method of claim 1 , further comprising:

generating physiological information in response to the PDS; and associating the physiological information with the predetermined signature.

3. The method of claim 1 , further comprising:

filtering a signal to isolate an alternating current (AC) signal noise;

sampling the AC signal noise in response to a variable including at least one of a time, a frequency, and a phase;

plotting the AC signal noise in a graph in response to the variable; and

storing the plotted sampled AC signal noise as a noise signature associated with a user.

4. The method of claim 1 , further comprising:

converting a signal noise in a time domain into a frequency domain to generate a power density spectrum of signal noise in an electrical physiological data signal (PDS);

sampling the power density spectrum of the signal noise at a plurality of frequencies;

plotting the sampled power density spectrum in a phase plot to view specific strange attractors that are substantially unique to a user; and

storing the phase plot as a noise signature associated with the user.

5. A method for an authentication system, the method comprising:

generating a machine noise signature associated with a user's computer;

generating a human noise signature associated with a human user; and

fusing together the machine noise signature and the human noise signature to form a user noise signature for secure data access over a network by the human user.

6. The method of claim 5 , wherein the user's computer includes a noise signal generator that monitors an electrical signal driven out by a processor to another electrical component within the computer, the electrical signal having a noise signal therein from which the machine noise signal can be generated.