Patent ID: 8793780
Filing Date: 2014-07-29
Classification: H04L

Abstract:
1. A method implemented at an authenticating device, the method comprising: storing, prior to receiving any authorization requests, a plurality of group shared secrets in memory accessible to the authenticating device, the plurality of group shared secrets comprising at least a first group shared secret and a second group shared secret, receiving a pre-authentication request comprising at least a reference for the first group shared secret of the plurality of group shared secrets, the pre-authentication request being transmitted from a first requesting device of the first plurality of requesting devices; verifying, at the authenticating device, the received pre-authentication request using said first group shared secret; receiving an authentication request comprising proof of knowledge of a secret shared exclusively between the authenticating device and the first requesting device; and when the authentication request is determined to have been transmitted from said first requesting device, authenticating the first requesting device in response to the authentication request.