Cross-layer Authentication Method based on Radio Frequency Fingerprint

A cross layer authentication method based on radio frequency (RF) fingerprint, wherein the method includes the following steps:

• S1. in the first time slot, a legitimate transmitter A sends the first packet to a legitimate receiver B, and then B identifies the first data packet by an upper layer authentication;
• if the upper layer authentication is successful, the legitimate sender A and the legitimate receiver B will establish the trust connection between them, and go to S2;
• if the upper layer authentication is failed, S1 will be repeated;
• S2. the legitimate recipient B extracts a RF fingerprint eigenvector of the legitimate sender A, and stores it in a memory of the legitimate receiver B;
• S3. in the next time slot, a sender X sends the second packet to the legitimate receiver B, and the legitimate recipient B extracts the RF fingerprint eigenvector of the sender X;
• S4. set a sample of the RF fingerprint eigenvector;
• S5. the legitimate receiver B carries out a RF fingerprint authentication to the RF fingerprint eigenvector of the sender X in S3 according to the RF fingerprint eigenvector, which means estimating the similarity between the RF fingerprint eigenvector of the sender X and the sample of the RF fingerprint eigenvector;
• if the similarity is greater than or equal to the set threshold, then the RF fingerprint authentication will be successful;
• the sender X is the legitimate sender A, and the RF fingerprint eigenvector of the sender X will be stored in the memory of the legitimate receiver B, then go to S3;
• if the similarity is less than the threshold, then the RF fingerprint authentication will be failed;
• the sender X is an attacker E, and the legitimate receiver B drops the second packet, then go back to S1.