Patent ID: 11936643
Assignee: NAGRAVISION SàRL
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A message sending device comprising:
a memory configured to store a plurality of message-tag pairs, each message-tag pair including a respective message from a plurality of messages and respective message tag from a plurality of message tags;
a communications interface configured to transmit message; and
a processor configured to:
combine each message of the plurality of messages with an authentication key to generate, for each message of the plurality of messages, a respective message tag of a plurality of message tags for validating one or more message tags associated with one or more future transmitted messages;
store each computed message tag of the plurality of message tags in the memory in association with a respective message of the plurality of messages as a respective message-tag pair;
select a message to communicate to a message receiving device;
retrieve a message tag from a stored message-tag pair corresponding to the selected message from the memory;
cause the communications interface to transmit the retrieved message tag corresponding to the selected message without the selected message;
in response to a trigger event, update the authentication key for computing one or more updated message tags;
combine each message of the plurality of messages with the updated authentication key to compute a plurality of updated message tags; and
store each updated message tag of the plurality of updated message tags in the memory in association with a respective message of the plurality of messages.