Patent ID: 8661256
Filing Date: 2014-02-25
Classification: H04L,H04W

Abstract:
1. A method of a first device establishing a key with a second device, the method comprising: sending from the first device to the second device, at least one first set of one or more digits to enable the second device to indicate the at least one first set of one or more digits; receiving from the second device, at the first device, at least one second set of one or more digits; indicating at the first device, the at least one second set of one or more digits; receiving, at the first device, an input verifying that the at least one second set of one or more digits being indicated by the first device is equivalent to the at least one second set of one or more digits received from the second device; enabling the first device to participate in a key agreement with the second device to establish a shared secret; generating, at the first device, an antispoof variable using the shared secret; and using, at the first device, the antispoof variable to authenticate the second device and establish the key with the second device by indicating one at a time in sequence, successive ones of the at least one second set of one or more digits, the timing of the indicating one at a time in sequence on the first device being synchronized with the timing of the indicating the antispoof variable one at a time in sequence on the second device based on a timing of messages used to establish the shared secret.