Patent ID: 7296207
Filing Date: 2007-11-13
Classification: H04L

Abstract:
1. A method of communicating datagrams between a first terminal having a first address, and a second terminal having a second address, of a communication system, wherein each datagram comprises redundancy check data used to verify datagram integrity, the method comprising the steps of: generating a first datagram comprising message data and first redundancy check data, which first redundancy check data is computed in dependence on the message data and the first address; sending the first datagram from the first terminal to the second terminal; verifying the integrity of the first datagram; generating a second datagram which comprises second redundancy check data, which second redundancy check data is computed in dependence on response data and the first redundancy check data; sending the second datagram from the second terminal to the first terminal; verifying the integrity of the second datagram; and in the case where the integrity of the second datagram is confirmed, identifying that the second datagram is the response to the first datagram.