Radar-based behaviometric user authentication

1. A method of authenticating a user using a mobile device, the method comprising:

generating and storing a first behaviometric user pattern for an authenticated user, said pattern including a position and velocity of said authenticated user relative to said mobile device, said position and velocity of said authenticated user relative to said mobile device determined by a received response from a radar transmission sent by said mobile device while said first user uses said mobile device, said radar transmission transmitted piece-wise continuously over time such that said received response indicates a position and velocity of said authenticated user over time;

determining, based on further received responses of additional radar transmissions sent by said mobile device, an additional behavioral pattern of an unknown user, said additional behavioral pattern including a position and velocity of said unknown user relative to said mobile device;

comparing said additional behavioral pattern to said first behaviometric user pattern;

determining heuristically, based on said comparing, a measure of similarity between said first behaviometric user pattern and said additional behavioral pattern;

determining, based on said measure of similarity, if said unknown user is said authenticated user;

preventing operation or access to at least some data stored on said mobile device if said unknown user is not said authenticated user; and

granting operation or access to at least some data stored on said mobile device if said unknown user is said authenticated user;

wherein said method comparing said additional behavioral pattern to said first behaviometric user pattern, determining heuristically said measure of similarity between said first behaviometric user pattern and said additional behavioral pattern, and determining if said unknown user is said authenticated user is carried out a predetermined period of time after an initial authentication of said first authenticated user periodically, to ensure that said mobile device continues to be operated by said first authenticated user.

2. The method of claim 1 , wherein said unknown user is said authenticated user, said method further comprising, prior to said determining said additional behavioral pattern, authenticating said authenticated user on said mobile device by detecting biometric or behavioral characteristics related to a gesture or movement of said authenticated user or said mobile device.

3. The method of claim 2 , wherein said additional behavioral pattern reinforces said authentication of said authenticated user based on said biometric or behavioral characteristics.

4. The method of claim 1 , wherein said received response from said radar transmission comprises a received response from a LIDAR (LIght Detection And Ranging) radar transmission.

5. The method of claim 1 , wherein said received response from said radar transmission comprises a received response from at least two radar transmissions of different types.

6. A method of authenticating a user using a mobile device, the method comprising:

generating and storing a first behaviometric user pattern for an authenticated user, said pattern including a position and velocity of said first authenticated user relative to said mobile device, said position and velocity of said authenticated user relative to said mobile device determined by a received response from a radar transmission sent by said mobile device while said first user uses said mobile device, said radar transmission transmitted piece-wise continuously over time such that said received response indicates a position and velocity of said first authenticated user over time;

determining, based on further received responses of additional radar transmissions sent by said mobile device, an additional behavioral pattern of an unknown user, said additional behavioral pattern including a position and velocity of said unknown user relative to said mobile device;

comparing said additional behavioral pattern to said first behaviometric user pattern;

determining heuristically, based on said comparing, a measure of similarity between said first behaviometric user pattern and said additional behavioral pattern;

determining, based on said measure of similarity, if said unknown user is said authenticated user;

preventing operation or access to at least some data stored on said mobile device if said unknown user is not said authenticated user; and

granting operation or access to at least some data stored on said mobile device if said unknown user is said authenticated user;

wherein said determining said additional behavioral pattern is synchronized in time with receipt, from said unknown user, of user responses to user prompts.

7. The method of claim 6 , wherein:

said user prompts are explicitly provided visually or audibly; and

said additional behavioral pattern includes at least two of a reaction time to a said user prompt, an acting velocity for responding to a said user prompt, and a specific motion or finger used for responding to a said user prompt.

8. The method of claim 6 , wherein said user prompts are implicitly provided, are hidden from said unknown user, and are based on said unknown user's desire to reach their goal without perceivable interference.

9. The method of claim 8 , wherein said implicitly provided user prompts include at least one of an open pop-up advertising banner prompting the user to close said pop-up advertising banner, a beeping or music sound prompting the user to terminate said beeping or music sound, and a small window prompting the user to resize the window.

10. The method of claim 6 , further comprising, prior to said generating said authenticated user pattern and to said determining said additional behavioral pattern, determining times or types of movements to be included in said authenticated user pattern and said additional behavioral pattern.

11. A method of authenticating a user using a mobile device, the method comprising:

generating and storing a first behaviometric user pattern for an authenticated user, said pattern including a position and velocity of said first authenticated user relative to said mobile device, said position and velocity of said authenticated user relative to said mobile device determined by a received response from a radar transmission sent by said mobile device while said first user uses said mobile device, said radar transmission transmitted piece-wise continuously over time such that said received response indicates a position and velocity of said first authenticated user over time;

determining, based on further received responses of additional radar transmissions sent by said mobile device, an additional behavioral pattern of an unknown user, said additional behavioral pattern including a position and velocity of said unknown user relative to said mobile device;

comparing said additional behavioral pattern to said first behaviometric user pattern;

determining heuristically, based on said comparing, a measure of similarity between said first behaviometric user pattern and said additional behavioral pattern;

determining, based on said measure of similarity, if said unknown user is said authenticated user;

preventing operation or access to at least some data stored on said mobile device if said unknown user is not said authenticated user; and

granting operation or access to at least some data stored on said mobile device if said unknown user is said authenticated user;

further comprising receiving user-specific credentials from said unknown user,

wherein said determining said additional behavioral pattern occurs during said receiving of said user-specific credentials from said unknown user,

wherein said additional behavioral pattern includes at least one of key pressing time stamps, swiping time stamps, and scrolling time stamps, as well as behavioral patterns of the user's finger movement during said unknown user entering said user-specific credentials.

12. The method of claim 11 , further comprising, using a machine learning based classifier to distinguish between said additional behavioral patterns stemming from different users.

13. The method of claim 11 , wherein said detected position and velocity of said authenticated user relative to said mobile device comprise a detected position and velocity of a finger or a hand of said authenticated user relative to said mobile device.