Название: Optical Cryptosystems
Автор: Naveen K. Nishchal
Издательство: IOP Publishing Ltd
Серия: IOP Series in Advances in Optics, Photonics and Optoelectronics
Год: 2020
Страниц: 180
Язык: английский
Формат: pdf (true), epub
Размер: 26.8 MB

Advanced technologies such as Artificial Intelligence (AI), Big Data, Cloud Computing, and Internet-of-Things (IoT) have changed the digital landscape, providing many new and exciting opportunities. However, they also provide ever-shifting gateways for information theft or misuse. Staying ahead requires the development of innovative and responsive security measures, and recent advances in optical technology have positioned it as a promising alternative to digital cryptography. Optical Cryptosystems introduces the subject of optical cryptography and provides up-to-date coverage of optical security schemes. Optical principles, approaches, and algorithms are discussed as well as applications, including image/data encryption-decryption, watermarking, image/data hiding, and authentication verification. This book also includes MATLAB codes, enabling students and research professionals to carry out exercises and develop newer methods of image/data security and authentication.

Owing to the unique features of light, such as parallel processing, high speed, and several degrees of freedom, it is envisaged that information can be highly secured and communicated to the intended recipients or authentic users employing optical technologies. It can be foreseen that with the multifaceted uses of advanced technologies, such as Artificial Intelligence (AI), Big Data, Cloud Computing, and Internet-of-Things (IoT), security will always remain an important challenge. Technologies provide several opportunities, but, at the same time, they also pose threats to information theft or misuse. Searching for a cyber expert or the attackers who attacked the digital algorithm would be very hard, because they can exist in large numbers anywhere in the world. On the other hand, finding out an attacker in the optics domain would be relatively easier. The security can be in terms of storage, in dissemination of the message, communication/transmission over conventional channels, protection of copyright/ownership, and steganography. Therefore, developments of newer alternative technologies are required to meet the challenges in the domains of scientific investigation.

The art and science of concealing information/data is called cryptography. The information/data/message to be concealed is called a plaintext (clear text) and the concealed form of message is called a ciphertext (encrypted text). In other words, cryptography is a process of converting plaintext into ciphertext and vice versa. The process of conversion from plaintext to ciphertext is called encryption and the reverse process that retrieves plaintext from ciphertext is called decryption. The ciphertext is a message that cannot be understood by anyone or is a meaningless message. A cipher is an algorithm used for encryption and decryption. The ciphertext is stored and transmitted to the intended user. The cryptography is not only used for protecting the information from theft or alteration but it is also used for user authentication.

This book intends to provide a collection of optical technologies for secure storage, secure communication, and the protection of copyright in terms of watermarking. Most of the optical techniques reported in literature can be traced around a double random phase encoding algorithm. Furthermore, many variants of this scheme have been proposed and demonstrated with improvements and different levels of complexity. This book aims to provide help to researchers in the field to get first-hand information of its progress.