Patent ID: 8234715
Filing Date: 2012-07-31
Classification: G11B,H04L,H04N

Abstract:
1. A method for authenticating a client computer system using Advanced Access Content System (AACS) cryptographic elements, the method comprising: receiving a plurality of permission nonces from the client computer system; in response to receiving the plurality of permission nonces, generating a plurality of authentication permissions that includes a first set of valid authentication permissions, wherein each authentication permission corresponds to a different permission nonce included in the plurality of permission nonces, and each valid authentication permission is generated based on an Advanced Access Content System (AACS) cryptographic key and a corresponding permission nonce; transmitting the plurality of authentication permissions to the client computer system; receiving validation data from the client computer system that indentifies one or more authentication permissions included in the plurality of authentication permissions that the client computer system has determined to be valid; and authenticating the client computer system only when each of the one or more authentication permissions matches a different valid authentication permission included in the first set of valid authentication permissions.