We review the field of quantum cryptography starting from the basic physical principles, discussing the classical information concepts involved, and review the experimental status. Finally, we discuss possible extensions of quantum cryptography beyond secret key generation, given that practical handling of multi quantum bit systems becomes feasible.
We review the field of quantum cryptography starting from the basic physical principles, discussing the classical information concepts involved, and review the experimental status. Finally, we discuss possible extensions of quantum cryptography beyond secret key generation, given that practical handling of multi quantum bit systems becomes feasible.
The quantum cryptography approach is a significant change in secure communication in the sense that quantum cryptography bases its security on the law of quantum physics as opposed to computation difficulty. With classical encryption methods rapidly losing their resistance to the power of the underlying computers as well as the expected possibilities of the quantum computers, quantum cryptography comes into the limelight as a possible method of securing information in the long term. The paper is a detailed and systematic review of quantum cryptography along with the fundamentals of this practice, the way it works, and its practical implementation. It describes the ability of quantum phenomena to be unique (including superposition, uncertainty, and disturbance of measurement) and able to secure a key exchange as well as ensure any attempt of eavesdropping would be automatically noticed.In the review, the authors mainly discuss quantum key distribution (QKD) protocols, their functioning principles, security assurances, and the benefits of quantum over classical key exchange schemes. Besides that, the paper critically evaluates the real issues surrounding the implementation of quantum cryptographic systems such as hardware limitations, transmission range, environmental noise, and compatibility, to existing compatibility infrastructures. Recent advances in the field of experiments and pilot implementations are presented to determine the maturity of new technologies, and their suitability to be used on a large scale. Through its analytical review of theoretical assets, as well as practical constraints, this paper offers a definite and equalist view of the state of quantum cryptography today and also explains the research priorities important in its scale, moving away of the test production systems to the dependable and extensive security measures.
Quantum cryptography is arguably the fastest growing area in quantum information science. Novel theoretical protocols are designed on a regular basis, security proofs are constantly improving, and experiments are gradually moving from proof-of-principle lab demonstrations to in-field implementations and technological prototypes. In this paper, we provide both a general introduction and a state-of-the-art description of the recent advances in the field, both theoretical and experimental. We start by reviewing protocols of quantum key distribution based on discrete variable systems. Next we consider aspects of device independence, satellite challenges, and protocols based on continuous-variable systems. We will then discuss the ultimate limits of point-to-point private communications and how quantum repeaters and networks may overcome these restrictions. Finally, we will discuss some aspects of quantum cryptography beyond standard quantum key distribution, including quantum random number generators and quantum digital signatures.
Quantum cryptography is arguably the fastest growing area in quantum information science.Novel theoretical protocols are designed on a regular basis, security proofs are constantly improv-ing, and experiments are gradually moving from proof-of-principle lab demonstrations to in-fieldimplementations and technological prototypes. In this review, we provide both a general introduc-tion and a state of the art description of the recent advancesin the field, both theoretically andexperimentally. We start by reviewing protocols of quantumkey distribution based on discretevariable systems. Next we consider aspects of device independence, satellite challenges, and highrate protocols based on continuous variable systems. We will then discuss the ultimate limits ofpoint-to-point private communications and how quantum repeaters and networks may overcomethese restrictions. Finally, we will discuss some aspects of quantum cryptography beyond standardquantum key distribution, including quantum data locking and quantum digital signatures.
Quantum Cryptography is a novel approach to make the information and network world more secure. Unlike classical cryptography, quantum cryptography ensures the security of communication because it is based on the laws of Quantum Mechanics; a branch of physics that deals with the fundamental behavior of matter and their energies to the levels of subatomic particles. These particles and their intrinsic properties such as photon polarization and entanglement allow us to develop an unbreakable system of cryptographic information. Conventionally, the security has been primarily concerned with the secured distribution of secret key carried over an insecure channel. However, in Quantum Cryptographic systems the transmission of secret key is done using aforementioned laws of nature through a secured quantum channel highly susceptible to intrusion detection. Consequently, the Quantum Key Distribution (QKD), in conjunction with protocols such as BB84 protocol has emerged as an ultimate modern secured communication system. This article concentrates on briefly reviewing quantum cryptography, some recent developments and reports of its vulnerabilities.
Quantum Cryptography is based on the use of subatomic particles (photons) and their intrinsic quantum properties (photon polarization) to develop an unbreakable system. It is not possible to measure the quantum state of any system without affecting the system. This property provides secure transmission of key between sender and receiver. Quantum Cryptography is a way to combine the relative ease and convenience of key exchange in public key cryptography with the ultimate security of a one-time pad. Quantum techniques for key distribution, the classically impossible task of distributing secret information over an insecure channel whose transmissions are subject to inspection by an eavesdropper, between parties who share no secret key initially. Quantum Cryptography uses the principles of Quantum Mechanics to implement a cryptographic system. The key problem which is solved by using quantum techniques is that of eavesdropping detection. The bits are represented as qubits, physically modeled by photons, and communicated over a quantum channel. The polarization states of photons represent 0's and 1's. Keyword: Asymmetric key, Cryptography, Protocols, Quantum, symmetric key
Quantum cryptography (or quantum key distribution) is a state-of-the-art technique that exploits properties of quantum mechanics to guarantee the secure exchange of secret keys. This 2006 text introduces the principles and techniques of quantum cryptography, setting it in the wider context of cryptography and security, with specific focus on secret-key distillation. The book starts with an overview chapter, progressing to classical cryptography, information theory (classical and quantum), and applications of quantum cryptography. The discussion moves to secret-key distillation, privacy amplification and reconciliation techniques, concluding with the security principles of quantum cryptography. The author explains the physical implementation and security of these systems, enabling engineers to gauge the suitability of quantum cryptography for securing transmission in their particular application. With its blend of fundamental theory, implementation techniques, and details of recent protocols, this book will be of interest to graduate students, researchers, and practitioners in electrical engineering, physics, and computer science.