Application of key exchange based physical layer security methods

A method enabling a physical layer security method to be applied in a wireless communication by making changes during a key phase, wherein the method comprises the step of generating a K common key, and further comprises the following steps to be carried out at a modulator during a data transmission phase:

• step 202) dividing an equivalent of a K key number in a binary system into n equal parts and converting an n number in the binary system into an equivalent of the n number and generating an n key equation (V), wherein the n key equation (V) is as follows:
• step 203) establishing a chip sequence by a Pseudo Noise (PN) sequence generator according to any of Kn keys generated for a direct sequence spread spectrum,
• step 204) converting a bit sequence desired to be transmitted by a transmitter from a serial format to a parallel format by grouping before a modulation process,
• step 205) converting the bit sequence previously converted to the parallel format, into an electromagnetic waveform such as an equation (VI) representing the bit sequence, wherein the equation (VI) is as follows:
• a. eiθ (VI),
• wherein a is an amplitude of a wave to be transmitted, and θ is a wave phase,
• step 206) applying a constellation rotation security method by adding a Kn number known by the transmitter and a receiver, representing a key function with an equation (VII) to a phase of waveforms transmitted, wherein the equation (VII) is as follows:
• a. ei(θ+Kn) (VII),
• wherein:
• 0<Kn<360,
• step 207) establishing an Root Raised Cosine (RRC) filter according to any of the Kn keys generated to apply a filter based security method,
• step 208) passing the electromagnetic waveform from a low pass filter formed,
• step 209) preventing a listener from obtaining data transmitted by applying a frequency hopping method according to any one of the Kn keys generated,
• wherein the method further comprising the process steps of, carrying out below-mentioned processes at a demodulator for the receiver to correctly demodulate a signal transmitted by the transmitter during the data transmission phase;
• step 302) dividing the equivalent of the K key number in the binary system into the n equal parts and converting the n number in the binary system into the equivalent of the n number and generating the n key equation (V),
• step 303) demodulating of a symbol by the receiver, where the transmitter applies a frequency hopping with the Kn key used in step number 209),
• step 304) establishing the low pass filter according to the Kn number used in step 207),
• step 305) passing the electromagnetic waveform from the low pass filter,
• step 306) taking out the Kn key in step 206) from waveform phases applied with a constellation rotation at the transmitter and converting the Kn key to an original state of the Kn key by of a reverse constellation rotation carried out at the transmitter,
• step 307) selecting a demodulation type of original waveforms according to a modulation type, in accordance with the Kn key that ii used in step 205),
• step 308) changing the bit sequence obtained in step 307) from the parallel format into the serial format,
• step 309) establishing the chip sequence according to the Kn number used in step 203) to obtain a data sequence, wherein for obtaining the data sequence, the direct sequence spread spectrum is applied.