Network Assumption Clause Samples

Network Assumption. The communication model, the protocol considers group-oriented communication so called many-to-many communication as shown in Figure 2.17; that is, messages are addressed to all the members. For the ease of presentation, in this section, the protocol assumes that all nodes in ad hoc networks are members of a group. In next section, the study discusses how this scheme can be extended for networks where not all nodes are members of a group. For that group-wide symmetric key is used to encrypt group broadcast message. Note that using pairwise shared keys for securing group communication does not improve security in comparison to a scheme based on group keys. This is because under both schemes an adversary only needs to compromise one node to obtain the group data; moreover, if pairwise keys are used for securing group data, a node will have to perform decrypting and re- encrypting for the data packets it is forwarding. The protocol assume that the resources of a node, such as power, computation and communication capacity, and storage are relatively constrained; thus a node neither can afford public-key operation nor has space for storing pre-deployed pairwise shared keys for all the nodes in the network. However, the protocol assumes that every node has space for storing key tree and computation capacity for computing product and inverse operation.