A communication system includes a first quantum key distribution device and an intermediary device. The first quantum key distribution device is configured to be coupled to a second quantum key distribution device over a quantum channel and to generate a shared key with the second quantum key distribution device based on a quantum state transmitted along the quantum channel. The intermediary device is disposed along a communication pathway within a network between a sender device and a receiver device. The intermediary device is communicatively connected to the first quantum key distribution device and configured to utilize the shared key to authenticate one or more data packets communicated from the sender device along the communication pathway by examining the one or more data packets for a presence of an information pattern that is associated with the shared key.
A communication system includes a first quantum key distribution device and an intermediary device. The first quantum key distribution device is configured to be coupled to a second quantum key distribution device over a quantum channel and to generate a shared key with the second quantum key distribution device based on a quantum state transmitted along the quantum channel. The intermediary device is disposed along a communication pathway within a network between a sender device and a receiver device. The intermediary device is communicatively connected to the first quantum key distribution device and configured to utilize the shared key to authenticate one or more data packets communicated from the sender device along the communication pathway by examining the one or more data packets for a presence of an information pattern that is associated with the shared key.
A communication system is provided that includes a first quantum key distribution device and a communication device. The first quantum key distribution device is configured to be coupled to a second quantum key distribution device over a quantum channel and to generate a quantum key based on a quantum state transmitted along the quantum channel. The communication device is communicatively connected to the first quantum key distribution device within a network. The communication device is configured to receive the quantum key from the first quantum key distribution device and transmit the quantum key to an end device in the network via a classical link to enable the end device to use the quantum key for encrypting and/or decrypting messages communicated through the network.
The present disclosure is directed to a system and method of distributing time information to enable synchronization in an authenticated manner via a quantum channel. A source device may transmit a timing signal, T on a communication channel from the source device to a receiver device. The timing signal T may be include a time or times stored in memory or calculated using a previously agreed upon formula. The method may include transmitting a quantum system Q from the source device to the receiver device. The quantum system may be prepared in a randomly chosen state and may be measured by the receiver device in a randomly chosen measurement basis.
An improved method of distributing timing information is provided. The method includes transmitting encrypted timing signals from two or more beacons at different locations. The encrypted timing signals are transmitted at regular intervals and are received by a receiver. The receiver then performs a logic operation on the encrypted timing signals and validates, based on the logic operation, the authenticity of the timing signals. The logic operation also results in a decrypted message from the beacons, which can contain additional information, for example, data to be sent back to the beacons to verify receipt.
The article considers the possibility of using a key distribution method in a wireless sensor network by analogy with the quantum key distribution method. It is assumed that the wireless sensor network is created using hardware that allows the use of a predetermined N communication channels in the key distribution session, out of all possible ones (Nmin ≤ N ≤ Nmax). The initialization of the key distribution procedure is initiated by the master device/central node. At a certain time, the initiator switches to the transmission mode, and the slave devices to the reception mode. The master device generates k binary code packets (half-bytes, bytes), the number of which is predetermined. Each packet is transmitted over a randomly selected channel nTX from the range N. Slave devices receive the packet data over a randomly selected channel nRX from the range N. Based on the received packets, the master and slave devices generate a key for data exchange in a pair. The key generation algorithm is as follows: the slave device randomly selects a reception channel from consecutive k packets, of which there is a number of channel matches q, with reliable data (nTX = nRX). The remaining (k – q) received packets are unreliable, because they contain random data (channel mismatch nTX ≠ nRX). The slave device transmits to the master device a binary packet with a sequence of its own reception channel numbers. The encryption-decryption key for the master-slave pair is formed on the basis of q reliable packets, which are also determined by the master device from the received packet of the sequence of reception channels. The cryptographic stability of the generated key depends on the number of received packets q containing reliable data, a given number of channels N of the slave device of the network, as well as on the number of channels identified by a potential attacker. Methods for software and hardware implementation of this algorithm are considered, and an analysis of experimental results of using the proposed algorithm is carried out.
An improved quantum key distribution (QKD) system and method are provided. The system and method introduce new clients at intermediate points along a quantum channel, where any two clients can establish a secret key without the need for a secret meeting between the clients. The new clients perform operations on photons as they pass through nodes in the quantum channel, and participate in a non-secret protocol that is amended to include the new clients. The system and method significantly increase the number of clients that can be supported by a conventional QKD system, with only a modest increase in cost. The system and method are compatible with a variety of QKD schemes, including polarization, time-bin, continuous variable and entanglement QKD.
A novel approach to secure data transmission, quantum communication draws on fundamental principles of quantum physics. It ensures that the transmitted information is private and accurate. To provide security, quantum networks implement physical constraints such as the no-cloning rule and quantum entanglement. In contrast, computational complexity is employed by classical networks. However, with the proliferation of multiuser quantum networks, identity verification has become more challenging. People with malicious intentions might easily disrupt services in long-distance quantum networks by impersonating legitimate nodes and sharing entangled resources and quantum channels. This highlights the absolute necessity of secure authentication systems tailored to quantum environments. Enhancements to recent quantum authentication systems have been made utilizing techniques that are resistant to quantum computing. Researchers are looking into quantum digital signatures, entanglement-assisted protocols, and quantum key distribution (QKD) authentication to make multi-party communications more secure. In order to prevent attacks where a user establishes a fraudulent identity or account, these strategies can be applied to quantum networks. This study takes a look at current quantum authentication systems and gives them the once-over, focusing on how well they could handle multiple users. The article delves into the evolution of authentication systems to accommodate the distributed model, where nodes can function as senders, receivers, or relays. We aim to strike a compromise between practicality and security in our lightweight, low-latency protocols. Additionally, the paper discusses quantum-specific issues, such as side-channel attacks and device malfunctions, and how authentication techniques can help prevent them. Finally, this study demonstrates that authentication is the critical component of secure quantum communication for multiple users. The most secure quantum key distribution methods are still vulnerable to attacks from inside or outside the system if proper authentication is not in place.