Optical Secret Key Sharing Method Based on Diffie-Hellman Key Exchange Algorithm

Abstract

In this paper, we propose a new optical secret key sharing method based on the Diffie-Hellman key exchange protocol required in cipher system. The proposed method is optically implemented by using a free-space interconnected optical logic gate technique in order to process XOR logic operations in parallel. Also, we present a compact type of optical module which can perform the modified Diffie-Hellman key exchange for a cryptographic system. Schematically, the proposed optical configuration has an advantage of producing an open public key and a shared secret key simultaneously. Another advantage is that our proposed key exchange system uses a similarity to double key encryption techniques to enhance security strength. This can provide a higher security cryptosystem than the conventional Diffie-Hellman key exchange protocol due to the complexity of the shared secret key. Results of numerical simulation are presented to verify the proposed method and show the effectiveness in the modified Diffie-Hellman key exchange system.

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

“…The second is that it is hard to represent a prime number on an optical device properly. In spite of these difficulties, we proposed an optical D-H secret key sharing method by modifying the conventional D-H key secret key sharing protocol [18]. In the proposed method, modulo arithmetic was mathematically replaced by an XOR logic operation.…”

“…So as to realize higher level of security, an advanced algorithm such as 3DES or asymmetric RSA public key cryptography was introduced as a means of solving this problem, which uses double key encryption technique. In our previous studies on the optical cryptosystem, a triple DES algorithm was proposed in an optical way based on dual XOR logic operation [17] and an optically modified D-H key exchange protocol was reported recently [18].…”

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.…”