nodes concerned 106 connect to a network access infrastructure 108 via an access point 110 which may be a wifi terminal or a cellular antenna in order to communicate with a remote security entity 112 in a preferential implementation the remote security entity 112 comprises at least one authentication server the authentication server 112 which is responsible for the authentication of nodes stores the cryptographic data required for the authentication of each of the nodes in the group 106 as detailed hereinafter each node further to its authentication receives keys which are shared with neighboring nodes which have been authenticated these keys are used for the establishment of secure communications in the network thus formed nodes on the network with limited resources access the remote security entity via a third party communication network 108 which may be a cellular network or the internet the network access infrastructure 108 may incorporate intermediate entities such as routers 114 and or intermediate servers 116 in the interests of the simplicity of the description and not by way of limitation of the invention although the example illustrated in fig1 shows a finite number of entities and connections an expert in the field will be able to extend the principles described in the present invention to encompass a plurality and a variety of nodes and types of servers bridges or connections wireless mobile very high capacity the network of nodes 102 may be based upon level 2 communications for example 802 15 4 or 802 11 and or level 3 communications for example ip depending upon the protocols applied multicast or broadcast communication schemes may be employed fig2 illustrates the steps deployed for the authentication.