A network includes a logical network and a physical network. The logical network includes a plurality of logical nodes. Each logical node is connected to a respective identification core. Each identification core includes at least one semiconductor chip having a physical randomness. Each semiconductor chip generates one of a plurality of pairs of private keys and public keys based on the physical randomness thereof according to an input received by the one of the at least one semiconductor chip under a public key cryptography. One of the public keys is regarded as a logical address of one of the logical nodes, which is connected to one of the identification cores. The physical network includes a plurality of physical nodes. Each identification core is one of components in each physical node. The logical network is uniquely linked to the physical network by the pairs of private keys and public keys.