Shared secret arrangements and optical data transfer
US8879735B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 18, 2013 |
| Grant date | Nov 4, 2014 |
| Priority date | — |
| Expiry date | Jan 18, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L63/18
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Digital data is optically broadcast through an environment by controllably switching the brightness or chrominance of LED solid state lamps, or of other illumination sources (e.g., television screens and backlit computer displays). This optical data channel is useful to convey cryptographic key data by which devices within the environment can authenticate themselves to a secure network. In some embodiments, the optical modulation is sensed by the camera of a smartphone. The row data output by the smartphone's camera sensor is processed to extract the modulated data signal. In some monochrome embodiments, data communication speeds far in excess of the camera's frame rate (e.g., 30/second), or even the camera's row rate (e.g., 14,400/second) are achieved. Still greater rates can be achieved by conveying different data in different chrominance channels. A great number of other features and arrangements are also detailed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.