Patent ID: 7853788
Filing Date: 2010-12-14
Classification: H04L,H04W

Abstract:
1. A method of authenticating computing devices on a communications network, the method comprising the steps of: receiving a first encrypted challenge from a computing device, wherein said first encrypted challenge comprises a first random number and a computing device identifier associated with said computing device, said first encrypted challenge being encrypted with a first network cryptographic key; decrypting the first encrypted challenge with a second network cryptographic key, and extracting the first random number and the computing device identifier; obtaining a first secret cryptographic key associated with said computing device identifier, and encrypting said first random number with said first secret cryptographic key; generating a second random number; transmitting a second challenge to said computing device, wherein said second challenge comprises said encrypted first random number and said second random number; decrypting said encrypted first random number with said first secret cryptographic key; determining whether said decrypted first random number corresponds to said first random number; in response to said decrypted first random number not corresponding to said first random number, said communications device aborting authentication; and in response to said decrypted first random number corresponding to said first random number: