Fig. 1. Working principle of PTFT optical compression encryption system

Fig. 2. Encryption flowchart of PTFT system based on compressed sensing

Fig. 3. Decryption flow of PTFT system based on compressed sensing

Fig. 4. Encryption and decryption image of the encryption system

Fig. 5. Grayscale histogram

Fig. 6. Correlation distribution of adjacent pixels

Fig. 7. The reconstructed image with different compression methods and different scales

Fig. 8. Comparison diagram of attack cracking and Mean Square Error（MSE）comparison chart

Fig. 9. Comparison diagram of attack cracking

Fig. 10. Decrypted images of salt and pepper noise interference under different noise ratios

Fig. 11. Decrypted images with Gaussian noise interference under different variances

Fig. 12. Cut encrypted and decrypted images of different sizes

Fig. 13. Selected plaintext attack effect diagram