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US 8,542,827 B2Granted
Shared encryption key generation via accelerometer digitization
AssigneeNXP B.V.
InventorCharles Razzell
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AssigneeNXP B.V.
InventorCharles Razzell
Estimating the term…
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.
A method performed by a device for generating a shared secret between the device and at least one additional device, the method comprising:
An apparatus comprising:
An apparatus comprising:
Dependencies are inferred from the claim text.