Patent ID: 8842827
Filing Date: 2014-09-23
Classification: H04L,H04W

Abstract:
1. A system for performing a cryptographic operation on a content signal, comprising: A. m root devices, wherein a root device is a mobile phone, each root device generating an associated root identity signal, each root identity signal being representative of a substantially unique characteristic of its associated root device, wherein the root identity signal is digital fingerprint of a substantially unique manufacturing variability characteristic of the associated root device, wherein the step of generating the root identity signal includes at least one of: (i) a noise reduction step or (ii) a de-noising filtering step, B. a host device for generating a host signal associated with the host device, wherein the host device is distinct from the m root devices, C. a key generator responsive to the host signal, wherein the key generator is part of the host device, and a plurality of root identity signals, for generating at least one cryptographic key signal based at least in part on a key generation rule, the host signal and the plurality of root identity signals, and D. a cryptographic operation device responsive to the cryptographic key signal, for performing a key-based cryptographic operation on the content signal, to generate a crypto content signal, the crypto content signal requiring at least two root identity signals from the m root devices for duplicating or reversing the key-based cryptographic operation.