Optical Implementation of Asymmetric Cryptosystem Combined with D-H Secret Key Sharing and Triple DES

Abstract

In this paper, an optical implementation of a novel asymmetrical cryptosystem combined with D-H secret key sharing and triple DES is proposed. The proposed optical cryptosystem is realized by performing free-space interconnected optical logic operations such as AND, OR and XOR which are implemented in Mach-Zehnder type interferometer architecture. The advantage of the proposed optical architecture provides dual outputs simultaneously, and the encryption optical setup can be used as decryption optical setup only by changing the inputs of SLMs. The proposed cryptosystem can provide higher security strength than the conventional electronic algorithm, because the proposed method uses 2-D array data, which can increase the key length surprisingly and uses 3DES algorithm, which protects against "meet in the middle" attacks. Another advantage of the proposed asymmetrical cryptosystem is that it is free to change the user's two private random numbers in generating the public keys at any time. Numerical simulation and performance analysis verify that the proposed asymmetric cryptosystem is effective and robust against attacks for the asymmetrical cipher system.

Optical Encryption Scheme with Multiple Users Based on Computational Ghost Imaging and Orthogonal Modulation

“…Subsequently, many methods were proposed to improve the security and develop its application [27][28][29][30][31][32]. In addition, several secret sharing schemes were proposed based on combination theory [33][34][35], in which a secret image is encrypted into multiple parts and transmitted separately to multiple users, and the secret can only be decrypted by the qualified set of users. This technique is a verification scheme for multiple users and brings security in many practical applications.…”