METHOD FOR GROUP KEY AGREEMENT

摘要

Disclosed is a key distribution method in a network system including at least one subnetwork. The method includes the following steps: a gateway node and each of multiple nodes included in a first subnetwork included in the at least one subnetworks generate a random number; each of the nodes generates a hiding value by hiding the generated random number; each of the nodes broadcasts the hiding value; the gateway node generates a gateway factor; the gateway node encrypts the gateway factor into a secret key allocated to each of the nodes; the gateway node transmits each of the encrypted gateway factors to the corresponding node among the nodes; each of the nodes decrypts the encrypted gateway factor; and each of the nodes generates a group key.