On the Intelligent Eavesdropping of Differential Frequency Hopping

Differential frequency hopping (DFH) was introduced as a new technology for reliable high data rate transmission. Since the system utilizes lower transmitting power relative to the other spread spectrum techniques and also principle part of the technique, frequency transition function (FTF), is designed privately and uniformly, the scheme is said to be safe and secure. In spite of previous researches, this paper shows that an intelligent eavesdropper may threat the security of the system by finding FTF and sending jamming signal toward authorized receivers. As a result, regular DFH can not provide consumers with security in wireless networks and hence we propose that FTF should be designed with random structure