Public-key-based optical image cryptosystem based on data embedding techniques

In this paper, a new asymmetric public key cryptography based on the modified RSA algorithm is proposed by using logic-based optical processing. The proposed asymmetric public key algorithm is realized into an optical schematic, where AND, OR and XOR logic operations are implemented by using free space digital optics architecture. Schematically, the proposed optical configuration has an advantage of generating the public keys simultaneously. Another advantage is that the suggested optical setup can also be used for message encryption and decryption by simply replacing data inputs of SLMs in the optical configuration. The last merit is that the optical configuration has a 2-D array data format which can increase the key length easily. This can provide longer 2-D key length resulting in a higher security cryptosystem than the conventional 1-D key length cryptosystem. Results of numerical simulation and differential cryptanalysis are presented to verify that the proposed method shows the effectiveness in the optical asymmetric cryptographic system.

Section: Introductionmentioning

confidence: 99%

Asymmetric Public Key Cryptography by Using Logic-based Optical Processing

Gil

2016

“…Another advantage of an optical cryptosystem is the potential for a large key length, rendering brute force attacks almost impossible. For these reasons, there has been a growing interest in optical cryptographic systems and several optical encryption techniques have been proposed in recent years [4][5][6][7][8][9][10][11][12][13]. Also, an optical XOR logic-based encryption has been introduced as one of these effective encryption algorithms [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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

Jeon

Gil

2015

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.

“…[2] Recently, various kinds of optical encryption techniques have been proposed for security systems because optical systems have merits of parallel processing and fast operation. [3][4][5][6][7][8][9][10][11] Among them the optical information is composed of complex function which is in phase and amplitude forms, and in order to get the complex encrypted data, a holographic recording technique may be required. This requirement makes it difficult to store and transmit the encrypted information over a digital network.…”

Section: Introductionmentioning

confidence: 99%

Dual Optical Encryption for Binary Data and Secret Key Using Phase-shifting Digital Holography

Jeon¹,

Gil²

2012

In this paper, we propose a new dual optical encryption method for binary data and secret key based on 2-step phase-shifting digital holography for a cryptographic system. Schematically, the proposed optical setup contains two Mach-Zehnder type interferometers. The inner interferometer is used for encrypting the secret key with the common key, while the outer interferometer is used for encrypting the binary data with the same secret key. 2-step phase-shifting digital holograms, which result in the encrypted data, are acquired by moving the PZT mirror with phase step of 0 or π/2 in the reference beam path of the Mach-Zehnder type interferometer. The digital hologram with the encrypted information is a Fourier transform hologram and is recorded on CCD with 256 gray level quantized intensities. Computer experiments show the results to be encryption and decryption carried out with the proposed method. The decryption of binary secret key image and data image is performed successfully.