Optical Implementation of Triple DES Algorithm Based on Dual XOR Logic Operations

Abstract

In this paper, we propose a novel optical implementation of a 3DES algorithm based on dual XOR logic operations for a cryptographic system. In the schematic architecture, the optical 3DES system consists of dual XOR logic operations, where XOR logic operation is implemented by using a free-space interconnected optical logic gate method. The main point in the proposed 3DES method is to make a higher secure cryptosystem, which is acquired by encrypting an individual private key separately, and this encrypted private key is used to decrypt the plain text from the cipher text. Schematically, the proposed optical configuration of this cryptosystem can be used for the decryption process as well. The major advantage of this optical method is that vast 2-D data can be processed in parallel very quickly regardless of data size. The proposed scheme can be applied to watermark authentication and can also be applied to the OTP encryption if every different private key is created and used for encryption only once. When a security key has data of 512×256 pixels in size, our proposed method performs 2,048 DES blocks or 1,024 3DES blocks cipher in this paper. Besides, because the key length is equal to 512×256 bits, 2 512×256 attempts are required to find the correct key. Numerical simulations show the results to be carried out encryption and decryption successfully with the proposed 3DES algorithm.

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

“…In our proposed secret key sharing method, we use an XOR-based double encryption. This technique is very similar to the triple DES (Data Encryption Standard) algorithm and was reported in the previous paper [22]. Most 3DES algorithms use two security keys.…”

“…The advantage of the free-space interconnected optical logic gate method is that no cell encoding-decoding process is required and the output has the same format as the input. In the optical configuration of a logic gate, binary input variables are spatially dual encoded by using two's complement [22]. The architecture of XOR logic operation can be made by combining the logic AND scheme with the logic OR scheme.…”

“…Optoelectronic methods using digital logic may be adequate for encryption. Some researchers reported XOR(exclusive OR)-based optical encryptions [20][21][22]. Recently, a technique using fractional Fourier transform based key exchange was reported [23].…”

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

“…Decryption is the reverse. (6) About optical implementation of 3DES, we suggested a modified 3DES algorithm based on XOR logic operations [17]. In the proposed method, a triple encryption using double keys was used in a special way so as to avoid the key sharing of the double encryption with two keys.…”

“…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].…”