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CRC Press eBooks

Guardians of privacy

Suman Chahar

Published Dec 2, 2024• 0 citations
Publisher

Abstract

According to modern cybersecurity, the concept of public key cryptography or asymmetric cryptography is one of the basics. Public key cryptography uses two keys: A private key is kept in secret and a public key is distributed publicly. Traditionally, symmetric cryptography uses a single key for everything from encryption to decoding, while quantum methods operate differently. Digital signatures, key exchange data channels, and even secure communication have been made possible thanks to the paradigm shift in cryptography. This chapter highlights the emergence of the rudimentary concepts, computational rules, and relevant advantages of using public key cryptography. It is paramount that this technology is deployed to ensure the integrity, confidentiality, and authenticity of digital communications.

DOI
10.1201/9781003508632-2

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According to modern cybersecurity, the concept of public key cryptography or asymmetric cryptography is one of the basics. Public key cryptography uses two keys: A private key is kept in secret and a public key is distributed publicly. Traditionally, symmetric cryptography uses a single key for everything from encryption to decoding, while quantum methods operate differently. Digital signatures, key exchange data channels, and even secure communication have been made possible thanks to the paradigm shift in cryptography. This chapter highlights the emergence of the rudimentary concepts, computational rules, and relevant advantages of using public key cryptography. It is paramount that this technology is deployed to ensure the integrity, confidentiality, and authenticity of digital communications.
Cryptography has been in existence since before the advent of computers. It encompasses a variety of techniques designed to secure information, whether it is at rest or in transit. Symmetric key cryptography includes symmetric keys, which serve the dual purpose of encrypting and decoding communications. Descriptions have been provided for public/private key pairs, also known as asymmetric keys. Such pairs may be categorized as secret/public key pairs, where the private key remains confidential, while the public key is accessible to all relevant parties for communication and information exchange. The realm of private and public key cryptography is diverse. Recently, the National Institute of Standards and Technology (NIST) endorsed four post-quantum cryptography systems. This paper presents a comprehensive survey of cryptography, examining the implications of intricate cryptographic systems on our existing networks.
Secure data exchange over the network is ensured by the requirements of confidentiality, integrity and availability of information. To meet these requirements, sent data is encrypted on the sending side, and the received information is decrypted on the receiving side. Transmitted message is encrypted according to rules determined by the algorithm and key. Crypto security of encrypted information depends on the key length. Among the encryption algorithms, there are algorithms with a symmetric (private) key and with an asymmetric (public) key. Despite all the advantages of a private key, asymmetric keys are used to deliver it from one user to another (key distribution). However, high-performance quantum computers are capable to decrypt intercepted data. Therefore, modern cryptographic systems use quantum key distribution method. The idea of using quantum bits was proposed in 1970 by S. Wiesner. In 1984, Ch. Bennett and G. Brassard proposed the BB84 protocol. The use of «entangled » quanta for systems with quantum key distribution was offerred in 1991 by A. Eckert. All modern quantum cryptography systems are based on these above-mentioned protocols.
Quantum computing and quantum cryptography are two areas of research that have the potential to transform modern computing and communication. Quantum computing promises to solve computational problems that are beyond the reach of classical computers, while quantum cryptography provides a way to secure communication channels that is immune to eavesdropping. Quantum cryptography is one of the emerging topics in the field of computer industry. This article focuses on quantum cryptography and how this technology makes a valuable contribution to an intensive defense strategy of completely secure key distribution. The scope of this article covers the weaknesses of modern digital cryptographic systems, the basic concepts of quantum cryptography, the practical implementations of this technology, and its limitations. , and finally the future direction that quantum cryptography is headed. We describe the result of an apparatus and protocol designed to perform quantum key distribution, whereby two users do not share any secret information (no private or public keys are known). previously known) initially exchanges a random quantum transmission consisting of veryweakly polarized light rays. In particular, readers can explore the following topics in depth: current cryptographic schemes (symmetric and asymmetric), the difference between quantum and classical computing, challenges of quantum computing, quantum algorithms (Shor and Grover), public key cryptographic schemes affected, symmetry affected schemes, impact on hash functions and post-quantum cryptography
Privacy-preserving data-sharing mechanisms traditionally rely on data anonymization techniques, which aim to dissociate individual records from their corresponding data subjects in order to transform sensitive information into a form that minimizes the risk of re-identification. In parallel, trust-broker models have emerged as an additional layer of protection, whereby authorized data providers disclose controlled contact information that enables potential data users to request access under predefined conditions determined by the data owner. In contemporary data-sharing environments, cryptography remains a fundamental pillar for ensuring confidentiality and integrity during data exchange. Cryptographic protection typically involves two operations: an encryption process, in which the sender transforms plaintext into ciphertext that is unintelligible to unauthorized entities, and a decryption process, in which only the intended recipient restores the ciphertext to its original form. Both operations rely on a cryptographic algorithm paired with one or more secret keys. Symmetric-key cryptography employs a single shared key for both encryption and decryption. In contrast, asymmetric cryptography uses a mathematically linked pair of keys, where one key is used for encryption and the other for decryption. When the encryption key is publicly available while the corresponding decryption key remains private, only the legitimate recipient holding the private key is capable of recovering the plaintext. This cryptographic structure forms the basis for securing data confidentiality against unauthorized access in both classical and quantum-aware communication systems.
Users of communication channels wish to have their transactions secured. Therefore, it is necessary to develop techniques which can ensure that eavesdroppers cannot intercept the messages transmitted. The technology concerned with the secure communication of data is termed as cryptography [1-3]. It is the art of hiding information in the form of a string of bits to an unauthorized party. To achieve this goal, in a classical cryptography system the message bits are combined with random bits of equal length called a key. The combined data is known as cryptogram. This technique is called encryption. A key can be public or private. The public key is to encode plaintext, while the private key is for decoding the previously encoded plaintext or cryptogram. The cryptogram is generally sent through the communication channel. Because of the randomness of the key the encoded message is completely random. Consequently, the message is untraceable to an eavesdropper. The safety of the transmission completely depends on the safety of the key. Therefore, the key should be kept secret by the users.
Quantum computing is a new technology that may result in a revolution in the way data is transferred around the globe. However, it also has quite serious risks for existing cryptographic systems and thus, many encryption methods are insecure against quantum attacks. Future security frameworks will incorporate advanced quantum cryptography to overcome these issues. The use of post-quantum algorithms post-quantum algorithms and quantum key distribution quantum key distribution based on their fundamental concepts are strong defenses, according to quantum cryptography against quantum adversaries. Quantum cryptography is also demonstrated in its application to practical scenarios in important sectors such as infrastructure, healthcare, banking, and defense. Quantum cryptography and its potential to improve the global cybersecurity ecosystems through the integration of cutting-edge research and feasible methods of implementation are presented. It also describes the functions of quantum cryptography in securing private communications, maintaining data reliability, and handling the peculiar challenges of quantum threats. This work also focuses on how quantum cryptography is transforming security concepts and how this transformation is necessary to ensure the future of communication networks. The study reveals how quantum cryptography can transform the way secure communications are established and form the foundation of the digital society through the integration of theoretical ideas and practical applications.