Fully-phase optical image encryption in diffractive-imaging scheme with QR-code-based random illumination

Wang Zhipeng, Zhang Yingying, Gong Qiong, Li Shuyi, Qin Yi
2017
Based on a fully phase encoding and phase retrieval algorithm, a diffractive-imaging-based optical encryption scheme with random illumination is proposed. In the encryption process, a QR code image is placed in the optic path to modulate the incident light and thus generate a random illumination, which has been demonstrated to enable the proposed scheme to resist the multi-slice ptychographic phase retrieval algorithm attack. The plaintext is phase-encoded, and then encrypted by two random
more » ... masks. The diffraction pattern in the output plane is recorded as ciphertext by a CCD camera. For decryption, an iterative phase retrieval algorithm with median filtering operation is implemented. Simulation results demonstrate the effectiveness, security, and robustness of the proposal.
doi:10.5277/oa170206 fatcat:g4ngbnyfxvehzc44kp27a733sa