DEVELOPMENT OF OPTICAL IMAGE ENCRYPTION TECHNIQUES FOR INFORMATION SECURITY

Abstract

The wide spread use of networking and internet has led to remarkable research efforts in the area of information security. This thesis is to develop new techniques for optical image encryption, and to overcome some existing problems in conventional cryptosystems. Several works have been accomplished: (1) To develop nonlinear cryptosystems and enhance the security robustness in conventional DRPE technique. (2) To evaluate the security of asymmetric cryptosystems and develop corresponding improvement to the original cryptosystems. (3) To develop a new interference-based cryptosystem which would be able to resolved the silhouette problem. (4) To develop a nonlinear cryptosystem based on ghost imaging to enhance the security robustness in conventional ghost-imaging-based cryptosystem.