The invention discloses an OFDM-PON
physical layer encryption method based on three-dimensional
Arnold transformation of conservative digital chaos, and the method comprises the steps: S1, generatinga chaos sequence at a transmitting end through employing an initial value of a conservative digital chaos
system, adding disturbance to the generated chaos sequence, expanding the chaos sequence intoa plurality of groups of chaos sequences, and carrying out the PCA
processing of the chaos sequences, selecting a
chaotic sequence of the first principal component; S2, controlling parameters of three-dimensional
Arnold transformation by using the
chaotic sequence of the selected first principal component, and performing first-layer
encryption on the OFDM
signal; S3, randomly extracting and generating a
chaotic Frank matrix through a Frank sequence, performing second-layer
encryption on the OFDM
signal, converting the
signal subjected to secondary encryption into an optical signal through an electro-
optical modulator, and transmitting the optical signal to a receiving end through an
optical fiber channel; and S4, converting the optical signal into an
electric signal through a photoelectricdetector at a receiving end, decrypting the encrypted
electric signal by utilizing the secret key, and outputting
original data.