Patent ID: 9450757
Filing Date: 2016-09-20
CPC Classification: G06F,H04L

Claim Text:
1. A computer-implemented method of authenticating a first device using a communications protocol, comprising: establishing, by a second device, a secure mode of communications between the first and second devices through a first communications channel over an insecure communications network, receiving a public key from the first device, via the first communications channel; receiving, from the first device, a long hash of a hash key via the first communications channel; receiving, from the first device, the hash key under the public key, via the first communications channel; checking, by the second device, the received hash key to determine whether the received hash key produces the correct value for the long hash of the hash key; sending information of the second device to the first device, via the first communications channel, if the received hash key produces the correct value for the long hash of the hash key; receiving, by the second device, a digest value from the first device over a second communications channel, the digest value from the first device generated based at least upon information transmitted from the second device, wherein the second communication channel includes one or more connections via an ultrasonic channel; authenticating the first device by the second device if the received digest value is consistent with a calculated digest value by the second device, the second device configured to compare the received digest value with the calculated digest value, wherein the calculated digest value is determined, using a pseudo-random number generator (PRNG) of the second device, by steps comprising: in response to the received digest value from the first device being consistent with the calculated digest value on the second device, enabling the first device to send one or more instructions to control at least one function of the second device.