Shared encryption key generation via accelerometer digitization
US8542827B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 2009 |
| Grant date | Sep 24, 2013 |
| Priority date | — |
| Expiry date | Jan 17, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W12/68
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for generating a shared secret between at least two wireless portable electronic devices. A shared secret is generated by holding together the at least two devices and shaking them. An acceleration of the at least two devices is measured at least during a time window beginning at a time corresponding to when a magnitude of the acceleration exceeds a predetermined threshold. The acceleration is sampled, resulting in a plurality of vectors, such that a first vector is an initial sample of the acceleration during the time window. In some embodiments, the acceleration is measured in three dimensions. Dot products are calculated between the first vector and each of a plurality of subsequent vectors, resulting in an array of scalars. At least a portion of this array is used to generate the shared secret between the at least two devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.