Methods and systems for effecting transmitter and receiver synchronization between a transmitter and a receiver of a transmitter/receiver network
AssigneesSony Corporation, Sony Electronics Inc.
InventorRobert A. Unger
Life of this patent
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Abstract
Methods for effecting transmitter and receiver synchronization are disclosed. A method includes reading an authentication key value that is calculated by a receiver that is to receive protected content from a transmitter, determining if there has been a change in the authentication key value calculated by the receiver since it was last read and determining if a counter associated with the transmitter has a zero value. A re-authentication of the receiver is initiated if the counter associated with the transmitter has a non zero value and the authentication key value that is calculated from the receiver has changed.
Claims11
A method for effecting transmitter and receiver synchronization, said method comprising:
- reading an authentication key value that is calculated by said receiver that is to receive protected content from said transmitter;
- determining if there has been a change in said authentication key value that is calculated by said receiver since it was last read;
- determining if a counter associated with said transmitter has a zero value;
- initiating a re-authentication of said receiver if said counter associated with said transmitter has a non zero value and a change in said authentication key value was coincidentally detected, wherein said non zero value indicates a counter mismatch between said counter associated with said transmitter and a counter associated with said receiver when a change in said authentication key value is coincidentally detected.
A system for effecting transmitter and receiver synchronization, said system comprising:
- an authentication key value reader for reading an authentication key value that is calculated by said receiver that is to receive protected content from said transmitter;
- an authentication key value change detector for determining if there has been a change in said authentication key value calculated by said receiver since it was last read;
- a count determiner for determining if a counter of said transmitter has a zero value;
- and
- an authentication initiator for initiating a re-authentication if said counter of said transmitter has a non zero value and said key value calculated by said receiver has coincidentally changed, wherein said non zero value indicates a counter mismatch between said counter associated with said transmitter and a counter associated with said receiver when a change in said authentication key value is coincidentally detected.
Dependencies are inferred from the claim text.