Traditional cryptographic methods have persistence, which are based on the alleged impossibility of solving a certain mathematical problem for a polynomial time. As an alternative quantum cryptography technologies don't depend on the computational capabilities of the intruder, because they use the unique properties of quantum particles, and are based on the principles of quantum physics laws inviolability. There are many methods and approaches used to solve the tasks of securing the privacy of message transmission without the use of encryption. One of the most advanced quantum cryptography technology is quantum direct secure communication, which allows information transmitting by an open channel without prior encryption. For this purpose, model of quantum deterministic protocol (for two modes of work) was created. Also the experimental studies of a deterministic protocol model in a channel with noise were carried out.
Traditional cryptographic methods have persistence, which are based on the alleged impossibility of solving a certain mathematical problem for a polynomial time. As an alternative quantum cryptography technologies don't depend on the computational capabilities of the intruder, because they use the unique properties of quantum particles, and are based on the principles of quantum physics laws inviolability. There are many methods and approaches used to solve the tasks of securing the privacy of message transmission without the use of encryption. One of the most advanced quantum cryptography technology is quantum direct secure communication, which allows information transmitting by an open channel without prior encryption. For this purpose, model of quantum deterministic protocol (for two modes of work) was created. Also the experimental studies of a deterministic protocol model in a channel with noise were carried out.
Security and reliability of traditional cryptographic methods for ensuring confidentiality is questionable taking into account contemporary threats (HPC, Grid technologies, quantum computing et al). Alternatively, quantum cryptography has proven itself as a more reliable information security technology. It's independent from intruder computational capability, uses specific unique properties of quantum particles, and based on quantum physics laws inviolability. However, data transmission using deterministic quantum protocol with depolarizing quantum channel is not studied today (potentially, intruder can hide his probes in this channel). From this viewpoint, the model of an intruder control mode for deterministic protocol with Bell states of qutrit pairs in the noisy depolarizing channel is developed and a simulation of this protocol in such channel is fulfilled. Also, the formula for a total probability of an error, which can arise both owing to attack, and owing to natural noise, at measurement in a intruder control mode is derived.
The development of modern computer technologies endangers the confidentiality of information, which is usually ensured by traditional cryptographic means. This circumstance forces us to look for new methods of protection. In view of modern trends, quantum cryptography methods can become such alternatives, which allow solving a number of important cryptographic problems, for which the impossibility of solving using only classical (that is, non-quantum) communication has been proven. Quantum cryptography is a branch of quantum informatics that studies methods of protecting information by using quantum carriers. The possibility of such protection is ensured by the fundamental laws of quantum mechanics. One of the promising directions of quantum cryptography is Quantum Secure Direct Communication (QSDC) that offers secure communication without any shared key. A characteristic feature of this method is the absence of cryptographic transformations, accordingly, there is no key distribution problem. The purpose of this work is a general overview of quantum cryptography protocols, finding their weak points for further development and improvement, as well as identifying vulnerabilities to different attacks. The article analyzes new methods and protocols, as well as presents their advantages and disadvantages. Based on partial generalizations of theoretical provisions and practical achievements in the field of quantum cryptography, a generalized classification was developed. By comparing various factors of the protocols, and their resistance to certain cyberattacks, we have the opportunity to identify several problems in this field and expand the possibilities for choosing appropriate methods for building modern quantum information protection systems. In accordance with this, conclusions were presented regarding the use of protocols and increasing the level of their effectiveness.
Today acutely raises the issue of providing information confidentiality in conditions of growth quantity and quality of violations in cyberspace that are constantly improving and developing. Reliability of traditional methods for ensuring confidentiality is questionable taking into account contemporary threats. So look for alternative methods and means of security is urgent issue. Significant interest causes quantum cryptography, which do not depend on computing or other capabilities of offender, uses specific unique properties of quantum particles, and based on the inviolability of the laws of quantum physics. One of the most advanced technology of quantum cryptog-raphy is quantum secure direct communication, which can transmit information directly by open channel (without encryption – in this case there is no key distribution problem), but they have only asymptotic resistance to noncoherent attacks and, certainly requires some methods for amplification security. In this regard, developed a method of ensuring the stability of quantum cryptography protocols. To evaluate the effectiveness of this method was developed a methodology for conducting experimental research, according to which it is made comparing of its performance with known method. According to the obtained results, the proposed method has a speed in 1.52 times faster against analogs at the same level of resistance to noncoherent attacks.
Quantum cryptography is a new method of communication offering the security of the inviolability by using Law of Nature.Quantum Cryptography uses different secure communication by applying the phenomena of quantum physics. Unlike traditional classical cryptography, which uses mathematical techniques to restrict eavesdroppers, quantum cryptography is focused on the properties of physics of light for information. Quantum cryptography depends only on the validity of quantum theory, i.e., it is guarantied directly by the laws of physics. This is a different from any classical cryptographic techniques. This paper summarizes the current state of quantum cryptography and provides potential extensions of its feasibility as a mechanism for securing existing communication systems.
Today‟s wireless network has become one of the most important communication medium. However, providing secure communication for wireless network has become the challenging issues at present days. In present communication system, traditional cryptography was used for secure communication. It has more computational complexity and intruder may easily retrieve the encrypted messages. To overcome this complexity we aim to design a new protocol using quantum bits for enhancing the security. Quantum mechanics defines structure and behavior of quantum bits (i.e.) often called Qubits and it is thousand times faster than traditional one. A traditional computer system uses two bits 0 (or) 1. In quantum system uses Qubits that is normally represented mathematically by vectors such as |0>, |1> as two states, and four bases |H>, |V>, |R>, |L>. By this quantum cryptography method two parties may generate secret cryptographic key known as checkbits which are generated using static quantum channel. Two channels namely public and hidden channels are used to transfer data through secured mode without encryption. By using hidden channel concept in quantum mechanics, secure transmission of data without encryption can be done.
With the measureless, huge and rapid data exchange in network environments and increasing the attackers capabilities, quantity and quality of violations in cyberspace, information security has become the most important process for data storage and communication. Reliability of traditional methods for ensuring confidentiality is questionable, taking into account contemporary threats. Thereby, search of alternative methods and means for security is urgent issue. Significant interest causes quantum cryptography, which do not depend on computing or other capabilities of intruder, uses specific unique properties of quantum particles, and based on the inviolability of quantum physics laws. One of the most advanced quantum cryptography technology is quantum secure direct communication, which can transmit information directly by open channel, but it has only asymptotic security to non-coherent attacks and, certainly requires some methods for security amplification. In this regard, high- speed privaсy amplification method for quantum cryptography protocols was developed. To evaluate the effectiveness of this method was developed a methodology for experimental research, under which comparing of its performance with known method was made. According to the obtained results, the proposed method has a speed faster against analogs at the same level of security against non-coherent attacks.