Multiple-information security system using key image phase and chaotic random phase encoding in Fresnel transform domain

Abstract

A novel multiple information security system based on key image phase and chaotic random phase encoding is proposed. First, a key color image is separated into R, G, and B channels. Each channel of key image is scrambled by using a chaotic permutation method based on the two-coupled logistic maps and then key phase mask is produced. Second, secret color image is split into R, G, and B channels. Each channel of secret image is phase encoded and modulated by corresponding key phase mask and chaotic random phase mask. Each modulated channel of authenticated users is combined independently together to get three resultant channels, which are Fresnel transformed to obtain corresponding encrypted channels. The parameters of key phase mask and chaotic random phase mask are exploited as decryption keys, which provide nonlinearity to proposed system. Consequently, it circumvents potential attacks. The remarkable advantage of the proposed system is introduction of key phase mask for an individual user, as the key phase mask having multiple decryption keys is constructed by scrambled key image of an individual user. Moreover, the storage, transmission and management of decryption keys are convenient. The proposed system can be executed by using a simple hybrid optoelectronic system. Numerical simulation results demonstrate the viability and efficiency of the proposed system.