Secure and noise-free holographic encryption with a quick-response code

In holographic encryption,double random-phase encoding in the Fresnel domain(DRPEiFD)is a prevalent encryption method because it is lensless and secure.However,noises bring adverse effects during decryption.In this letter,we introduce quick-response(QR)coding during encryption to resist noises.We transform the original information into a QR code and then encrypt the code as a hologram through DRPEiFD.To retrieve the input,we decrypt the hologram in the opposite manner to the encryption and subsequently obtain a QR code with noises.By scanning this code with proper applications in smartphones,we can obtain a noise-free retrieval.Numerical experiments and images scanned by a smartphone are shown to validate our proposed method.