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

Claim 0:
1. A message receiving device comprising:
a memory configured to store a plurality of messages and corresponding message tags;
a communications interface configured to receive a message tag from a message sending device without a corresponding message; and
a processor configured to:
combine each message of the plurality of messages with an authentication key to compute, 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 received messages;
store the plurality of message tags in the memory prior to receiving the message tag from the message sending device;
validate the received message tag based on comparing the received message tag with the stored plurality of message tags to identify a matching message tag;
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 the plurality of updated message tags in the memory.