Radio frequency fingerprint based cross-layer authentication method

The invention discloses a radio frequency fingerprint based cross-layer authentication method. The radio frequency fingerprint based cross-layer authentication method comprises the following steps of: S1, in a first time slot, sending a first data packet from a legal sender A to a legal receiver B and carrying out an upper-layer authentication for the first data packet; S2, extracting the radio frequency fingerprint characteristic vector of the legal sender A and storing the radio frequency fingerprint characteristic vector in a storage of the legal receiver B; S3, in the next time slot, sending a second data packet from a sender X to the legal receiver B and extracting the radio frequency fingerprint characteristic vector of the sender X; and S4, setting a radio frequency fingerprint characteristic vector sample; S5, judging the similarity degree of the radio frequency fingerprint characteristic vector of the sender X and the radio frequency fingerprint characteristic vector sample; if the similarity degree is greater than or equal to a set threshold, indicating that the radio frequency fingerprint authentication is successful and storing the radio frequency fingerprint characteristic vector of the sender X and turning to the step S3; and otherwise, indicating that the radio frequency fingerprint authentication is failed, discarding the second data packet and turning to the step S1. The radio frequency fingerprint based cross-layer authentication method has the characteristics of low complexity, low time delay and high precision.