Research On Efficient And Security Networking Technology Based On Uncoordinated Frequency Hopping

Frequency hopping communication is one of the most commonly used traditional anti-jamming communication technologies. In this technology, in order to ensure the anti-jamming ability, the transmitter and the receiver need a pre-shared key before the start of the formal communication. Only the pre-shared key has been established successfully, the anti-jamming ability of the follow-up frequency hopping communication can be ensured. However, there are a lot of unsafe factors in the complex electromagnetic environment. The pre-shared secret key cannot be established successfully and securely before the formal communication between communication parties.Therefore, the study of a new anti-jamming communication technology, which could establish a key efficiently and securely in real time without a pre-shared key, has become a hot topic in the field of the secure communication. With this special security constraint, the key establishment between communication parties and the frequency hopping communication network between multiple nodes, are discussed and studied in this dissertation. The main research contents and innovations focus on the following two aspects:1.An efficient and secure method of key establishment is proposed. This method mainly solves the problem of how to set up a frequency hopping key between two nodes securely and efficiently.In the traditional frequency hopping communication, the frequency hopping key must be shared between the parties before their formal communication. This dissertation proposes an efficient and secure method of key establishment that enables communicating parties to establish a frequency hopping key efficiently and securely without the need of a pre-shared key, thus we improve the semi-closed anti-jamming communication into fully enclosed anti-jamming communication. In this method, we combine the UFH (Uncoordinated Frequency Hopping) and the identity-based key establishment protocol to ensure the key establishment process is anti-jamming and efficient. Through theoretical analysis and simulation, we demonstrate that our proposed method reduces the number of transmitted packets by 90% compared with the Diffie-Hellman key establishment protocol, and greatly improves the efficiency of key establishment based on the UFH communication mode.2.A multi-channel MAC protocol based on virtual public security channel is proposed. This protocol mainly solves the problem of how to set up a communication network between multiple nodes efficiently and securely.Most common multi-channel MAC protocols require at least one fixed public frequency. In order to overcome this defect and further enhance network throughput, this dissertation proposes a multi-channel MAC protocol based on virtual public security channel. This protocol does not require a common synchronous frequency or a public control frequency. The protocol uses the frequency sequence of the same key as the virtual public security channel. Its frequency hopping mode not only ensures global synchronization, but also ensures that each node can negotiate frequency allocation and access securely and effectively. Through theoretical analysis and simulation, we demonstrate that the proposed MAC protocol is still able to maintain high network throughput when the network load is heavy.