A compressive sensing (CS) based ptychography combined with an optical image encryption is proposed. The diffraction pattern is recorded through ptychography technique further compressed by non-uniform sampling via CS framework. The system requires much less encrypted data and provides high security. The diffraction pattern as well as the lesser measurements of the encrypted samples serves as a secret key which make the intruder attacks more difficult. Furthermore, CS shows that the linearly projected few random samples have adequate information for decryption with a dramatic volume reduction. Experimental results validate the feasibility and effectiveness of our proposed technique compared with the existing techniques. The retrieved images do not reveal any information with the original information. In addition, the proposed system can be robust even with partial encryption and under brute-force attacks.
Nitin Rawat, Nitin Rawat,
"Compressive sensing based ptychography image encryption", Proc. SPIE 9598, Optics and Photonics for Information Processing IX, 95980N (9 September 2015); doi: 10.1117/12.2187372; https://doi.org/10.1117/12.2187372