Abstract

We propose a split-encryption scheme on converting original images to multiple ciphertexts. This conversion introduces one random phase-only function (POF) to influence phase distribution of the preliminary ciphertexts. In the encryption process, the original image is mathematically split into two POFs. Then, they are modulated on a spatial light modulator one after another. And subsequently two final ciphertexts are generated by utilizing two-step phase-shifting interferometry. In the decryption process, a high-quality reconstructed image with relative error <TEX>$RE=7.6061{\times}10^{-31}$</TEX> can be achieved only when the summation of the two ciphertexts is Fresnel-transformed to the reconstructed plane. During the verification process, any silhouette information was invisible in the two reconstructed images from different single ciphertexts. Both of the two single REs are more than 0.6, which is better than in previous research. Moreover, this proposed scheme works well with gray images.

© 2013 Optical Society of Korea

Optical image encryption using a jigsaw transform for silhouette removal in interference-based methods and decryption with a single spatial light modulator

Pramod Kumar, Joby Joseph, and Kehar Singh
Appl. Opt. 50(13) 1805-1811 (2011)

Interference-based multiple-image encryption with silhouette removal by position multiplexing

Yi Qin and Qiong Gong
Appl. Opt. 52(17) 3987-3992 (2013)

Optical image hiding with silhouette removal based on the optical interference principle

Xiaogang Wang and Daomu Zhao
Appl. Opt. 51(6) 686-691 (2012)

Multiple-image encryption based on interference principle and phase-only mask multiplexing in Fresnel transform domain

Qu Wang, Qing Guo, Liang Lei, and Jinyun Zhou
Appl. Opt. 52(28) 6849-6857 (2013)

Multiple-image encryption based on triple interferences for flexibly decrypting high-quality images

Wei-Na Li, Anh-Hoang Phan, Mei-Lan Piao, and Nam Kim
Appl. Opt. 54(11) 3273-3279 (2015)