# US 12,118,138 B2 · Vergence authentication

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- Number: US 12,118,138 B2
- Document ID: US12118138B2
- Status: Granted
- Kind: B2
- Application number: 17/671,448
- Filed: 2022-02-14
- Published: 2023-08-17
- Granted: 2024-10-15
- Earliest claimed: 2022-02-14
- Assignees: Tectus Corporation
- Applicants: Tectus Corporation
- Inventors: Michael Cabot Grace; Bryan Jeffery Moles
- Web page: https://patentgrep.com/patent/US12118138B2

## CPC

- G06F 3/013: {Eye tracking input arrangements (G06F3/015 takes precedence)}
- G06F 21/32: using biometric data, e.g. fingerprints, iris scans or voiceprints
- H04W 12/06: Authentication
- H04W 12/065: Continuous authentication
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A system and method for authentication. In some embodiments, the method includes displaying a plurality of objects to a user's left eye and to the user's right eye, and monitoring the user's eye positions while the user looks at a subset of the displayed objects, one at a time. The method may further include comparing an angular offset for an object of the plurality of objects to a vergence measured for the user's eyes while the user looks at the object.

## Claims

### Claim 1

A method for granting access to a machine, comprising:
displaying separately to a user's left eye and to the user's right eye, a plurality of numerical digits with an external binocular display system comprising a left display and a right display, wherein the digits are displayed in numerical order in a keypad layout, the digits appear at randomly selected distances, nearer digits appear larger than farther digits, and each digit is randomly displaced from a nominal position in the keypad layout by an offset that is less than a lateral separation between adjacent digits, the display system being capable of monitoring the user's eye motion and communicating with the machine;
monitoring the user's eye positions with the display system while the user looks at a subset of the displayed digits, one at a time and during the monitoring, for each digit:
comparing an angular offset to a vergence measured for the user's eyes while the user looks at the digit, wherein the angular offset is an angle between a first line between the user's left eye and the digit as displayed in the left display and a second line between the user's right eye and the digit as displayed in the right display, and the vergence is an angle between pointing directions of the user's left and right eyes;
determining whether or not the vergence corresponds to the distance at which the digit is displayed, determining whether or not the user looked at the digit in an order matching a predefined order of digits, and determining whether or not the user is a human and not a machine emulating a human;
repeating, twice or more, the displaying, monitoring, comparing and determining steps, each time with different randomly selected distances and displacements; and,
granting the user access to the machine in response to the vergence matching the angular offset for each digit, the order matching the predefined order, and the user being human, during each of the two or more repetitions of the displaying, monitoring, comparing and determining steps.

### Claim 2 (depends on 1)

The method of claim 1, wherein the displacements are in one or more directions in a plane.