Fig. 1. Images to be encrypted. (a) Original image 1; (b) original image 2; (c) original image 3; (d) original image 4

Fig. 2. Schematic of multi-image Fourier transform frequency shifting synthesis

Fig. 3. Multi-image asymmetric encryption system based on full vector light field regulation of 4F system

Fig. 4. Multi-image encryption result

Fig. 5. Decryption result. (a) Decryption image 1; (b) decryption image 2; (c) decryption image 3; (d) decryption image 4

Fig. 6. Decryption result when the decryption key φ1 is perturbed. (a) Decryption result when r=1.75×10-7; (b) decryption result when r=-4.0×10-6

Fig. 7. Decryption result when the decryption key θ is perturbed. (a) Decryption result when p=2.0×10-5; (b) decryption result when p=-2.0×10-5

Fig. 8. Relationship between the average similarity and the change of the perturbation coefficient. (a) Perturbation coefficient r; (b) perturbation coefficient p

Fig. 9. Simulation result of shear resistance and noise immunity. (a) Shear resistance; (b) noise immunity

Fig. 10. Anti-chosen-plaintext attack simulation result. (a) Fake plaintext; (b) decrypted result of Fig.4