Optical encryption based on biometrics and single-pixel imaging with random orthogonal modulation

Computational ghost imaging (CGI), as a novel single-pixel imaging (SPI) technique, has a great potential and bright prospect in the field of optical information security owing to its encryption performances of data compression and real-value ciphertext. However, there are some vulnerabilities in CGI-based encryption technique, such as serious noise in the decrypted result, huge amount of keys, and several potential security loopholes. To address these issues, we propose an optical encryption method based on biometrics and SPI with random orthogonal modulation (ROM) in this paper. The ROM, which is generated by Hadamard matrix, not only improves the clarity of the decrypted images but also reduces the amount of keys to be transmitted. Besides, the security loophole for forgery attack in CGI-based encryption system is effectively blocked by fingerprint key. Both numerical simulations and optical experiments are carried out to test the feasibility and performance of our proposed method.