Modifying a property of a sequence of packets sent to uniquely identify an entity on a network such as a network encrypted

An apparatus (610) comprising: one or more processors (621); and one or more memories (625) including a computer program code (623), wherein the one or more memories (625) and computer program code (623) configured to, with the one or more processors (621), cause the apparatus (610) performs at least the following: send over the network from a source entity to a destination entity a sequence of a plurality of packets, each packet of the sequence comprising the same identifier corresponding to a network entity in the network, wherein the sending comprises modifying a property of the packet sequence to uniquely identify the sequence of packets; and receive information indicating that the identifier corresponds to the change of ownership.