A facile encryption way was successfully applied to the holographic optical encryption system with high speed, multi-dimensionality, and high capacity, which provided a better security solution for underwater communication. The reconstructed optical security system for information transmission was based on wavelength λ and focal length f that were keys to encryption and decryption. To finish the secure data transmission (λ, f) between sender and receiver, an extended Rivest-Shamir-Adleman(ERSA) algorithm for the encryption was achieved based on three-dimension quaternion function. Therein, the Pollard’s rho method was used for the evaluation and comparison of RSA and ERSA algorithms. The results demonstrate that the message encrypted by the ERSA algorithm has better security than that by RSA algorithm in the face of unpredictability and complexity of information transmission on the unsecure acoustic channel.
A facile encryption way was successfully applied to the holographic optical encryption system with high speed, multi-dimensionality, and high capacity, which provided a better security solution for underwater communication. The reconstructed optical security system for information transmission was based on wavelength λ and focal length f that were keys to encryption and decryption. To finish the secure data transmission (λ, f) between sender and receiver, an extended Rivest-Shamir-Adleman(ERSA) algorithm for the encryption was achieved based on three-dimension quaternion function. Therein, the Pollard’s rho method was used for the evaluation and comparison of RSA and ERSA algorithms. The results demonstrate that the message encrypted by the ERSA algorithm has better security than that by RSA algorithm in the face of unpredictability and complexity of information transmission on the unsecure acoustic channel.
Abstract Recent progress in multidimensional multiplexing offers promising paths for next‐generation optical encryption. However, challenges remain in integration, dimensional expansion, and dynamic tunability. Here, a highly integrated optical encryption strategy is proposed that achieves 8‐channel multiplexing by combining polarization, wavelength, and spatial position within a single liquid crystal (LC) element, greatly increasing information capacity in a compact format. A multi‐layered nested encryption scheme is constructed, where plaintext is first encoded into a password‐protected quick response (QR) code. Decryption involves extracting far‐field holographic keys via wavelength and position, followed by Rivest–Shamir–Adleman (RSA) decryption and 26‐base preprocessing, and finally combining with polarization‐decoded data to retrieve the QR password and recover the plaintext. This hybrid scheme merges physical multiplexing with algorithmic decryption, enhancing both complexity and security. Additionally, the electro‐optical tunability of LCs adds an extra layer of security by allowing on‐demand encryption modulation. The proposed element demonstrates multifunctionality, high integration, and structural simplicity, showing strong potential for secure and scalable applications in optical encryption.
with the growing concerns of the current network security, development of hybrid cryptosystem based on the combination of optical symmetric cryptography and public key cryptography has aroused considerable research interest. In optical symmetry system, a new method for encrypting optical information using Fresnel lenses is proposed. The symmetry system’s keys include the focal length (f) and propagation wavelength (λ). Then, in public key cryptography, the key (λ,J) is encrypted by the RSA algorithm. Finally, we have implemented and result have been obtained using 12-level digital Fresnel lens by COMSOL Multiphysics to study of how the optical image deciphered the information using encryption keys. In addition, the main challenges and future prospects for the further development of hybrid cryptosystem system are discussed.
Abstract Cryptography plays an important role in information security, which is widely applied in the various fields of society. Quantum cryptography has shown its great advantages in information security compared with the classical one. Two major directions of quantum cryptography are quantum key distribution (QKD) and quantum encryption, with the former focusing on secure key distribution and the latter focusing on encryption using quantum algorithms. In contrast to the well accepted success of the QKD, the development of quantum encryption is rather limited because of the difficulties of building up algorithms and the constructing the practical quantum computers. Here we propose a new scheme of quantum encryption based on high-dimensional entanglement holography. Firstly, we experimentally realize the quantum holography based on the high-dimensional orbital angular momentum (OAM) entanglement. Then, OAM-selective holographic scheme for quantum encryption is proposed and demonstrated. Our results show that introducing quantum entangled state into OAM holography makes the OAM holography possess infinite information channels and the transmission of information be absolute security in principle. Furthermore, decryption in the presence of strong noise is achieved. Our work opens up a new way to realize quantum information security.
Abstract Optical encryption techniques in over the last 10 years have become more important in the area of optical information processing. Several applications, including online payments, medical or biometric image storage or transmission, private military applications, police identification techniques, online banking platforms, governmental services, identity (ID) cards, etc., are only a few examples. Require special and reliable security in the transmission and storage of images. Since digital picture information may be readily accessed by hackers via transmission over the Internet or other communication channels, the issue of photos with unlawful usage is becoming more and more severe. A more effective and secure means of communicating images may be offered via optical encryption. The encryption mechanism and keys are needed at the receiver side in order to decrypt the original optical data. Picture security becomes a highly important subject in communication science as a result of network growth and rising need for image transmission. There are several security issues with picture data, including forgery detection and illegal access. The most straightforward method of picture protection is to encrypt it as text. The traditional text encryption algorithms are inappropriate for picture encryption because of the high correlation present in image data. Over the last two decades, a number of optical approaches have been proposed for photo encryption, with the specific advantage of processing two-dimensional (2D) image data in parallel conduction mode. Therefore, we are doing an extensive investigation on optical image encryption in this work.
Abstract This paper presents a novel multi-layer secure communication system that bases 2D-OCDMA technology to enhance the security and number of users of the system. The system innovatively combines RSA encryption, polarization multiplexing, and address coding techniques to protect and transmit the data. At the transmitting end, the data is encrypted by algorithm and then encoded by address code. The encoded optical data is split into two orthogonal polarization states and sent over the same channel. At the receiving end, only the optical signals in the matching polarization state can be retrieved by the polarizer with the right angle. The retrieved data is then decoded by the address code and decrypted by the algorithm to recover the original data. This system achieves multi-layer security and capacity enhancement by processing the information at different layers. The feasibility of the system is demonstrated by joint experimental simulation using Java programming language and Optisystem simulation software. In this paper, low BER transmission of 4 code words for 8 users 50 km 1Gbit/s is realized using optical orthogonal codes (OOC) with BER around 10−30. It realizes the enhancement of 4-user to 8-user without affecting the transmission effect.
Abstract Optical encryption is an emerging technique that uses optical systems to securely encode and decode information for data transmission. In this study, we present an integrated optical encryption platform that consists of a scattering-augmented ptychographic encryption system, a transmission-efficient compressive sampling strategy, and a high-capacity decryption algorithm based on a hybrid model-data driven approach. Our encryption system leverages random light scattering as a physical unclonable function, enabling the encoding of complex object wavefronts with high optical throughput. In contrast to traditional encoders that offer insecure pseudo-randomness, the light scattering process ensures true randomness in the reported platform. To optimize transmission efficiency, we implement a compressive sampling strategy that reduces data transmission volume by at least one order of magnitude. Moreover, we devise a decryption algorithm that merges model-driven optimization with data-driven deep learning, effectively addressing the highly underdetermined retrieval task and providing robust decryption against various measurement noise and communication interference. The efficacy of our system is corroborated by an integrated optical prototype capable of encrypting ten million of pixels within minutes. Communication experiments confirm the resilience of our decryption algorithm, which retrieves high-fidelity results even under extreme transmission conditions characterized by a 20% bit error rate. Our innovative encryption technique presents a comprehensive solution for high-capacity data transmission, fortified by scattering-augmented security.