23 results about "Quantum secure direct communication" patented technology

The present application relates to a quantum key distribution (QKD) and quantum secure direct communication method. The method is applied to a sender, and comprises: processing plaintext information to be sent, so as to obtain a codeword; encrypting the codeword by means of an encryption key in a key pool, so as to obtain ciphertext; performing encoding processing involving increasing the channel capacity by means of masking on the ciphertext, so as to obtain a codeword which has been subjected to encoding involving increasing the channel capacity by means of masking; using a QKD protocol to process the codeword which has been subjected to encoding involving increasing the channel capacity by means of masking, so as to obtain processing result information, wherein the processing result information enables a receiver to acquire a measurement result on the basis of the QKD protocol; on the basis of the QKD protocol, performing QKD post-processing to acquire a QKD post-processing result; and on the basis of the QKD post-processing result, generating a new key, and storing the new key in the key pool. The present solution can not only complete QKD, but also directly transmit a secret message on a quantum channel, and significantly increases the communication distance and communication speed of quantum secure direct communication.

The present invention belongs to the technical field of quantum secure communication, and discloses a multi-party quantum identity authentication method based on multi-party quantum secure direct communication to verify whether multiple parties actually communicating with the verifier are its legitimate collaborators. The present invention applies the multi-party quantum secure direct communication technology to multi-party quantum identity authentication. Among them, the verifier shares a set of keys with multiple target communicators in advance through quantum key distribution. The verifier prepares a series of multi-photon GHZ states and distributes them to itself and multiple parties to be proved. After the parties to be proved perform encoding operations according to the authentication keys shared with the verifier in advance, they return the photons to the verifier, and the verifier performs GHZ state analysis to realize the simultaneous identity verification of multiple parties to be proved. This method can authenticate the identities of multiple users at the same time, effectively improve the authentication efficiency, and is of great significance for promoting the practical application of quantum secure direct communication in the field of quantum authentication.

The invention discloses a single-photon quantum secure direct communication attack method based on weak random basis selection. Bob prepares a group of single photon sequences SA, and Bob transmits all photons of SA to Alice through a quantum channel; eve intercepts all photons of the SA sequence; after receiving the photons, Alice randomly extracts a part of photons to carry out safety detection so as to obtain a detection error rate; if the bit error rate is detected to be lower than a preset threshold value, the Alice arranges the remaining photons into a sequence SB; the Eve intercepts a photon sequence SB sent by the Alice, and a new single photon state is prepared again, inserted into a corresponding position in the SB and sent to the user Bob; after the Bob receives the photon sequence SB, the photon sequence SB is stored in a quantum memory; alice publishes the position of a safety detection photon, and Bob carries out measurement and comparison so as to obtain a quantum bit error rate; and coding information of Alice is obtained. The method has important guiding significance for researching the security of the quantum secure direct communication under the actual experiment condition.

The purpose of the present disclosure is to perform quantum secure direct communication by using a time bin and a phase in a communication system, and a method thereof may comprise the steps of: acquiring system information; performing a random access procedure on the basis of the system information; generating a first signal; transmitting the first signal to a second device; receiving, from the second device, a second signal on which encoding has been performed by using the first signal; and decoding the second signal.

The present specification provides a quantum secure direct communication (QSDC) method by which a transmitting end transmits a message on the basis of differential time coding, in a quantum communication system. More specifically, the method comprises the steps of: receiving, from a receiving end on a quantum channel, (i) at least one initial time state configured by including a time interval equal to a dead time of a single photon detector of the receiving end and (ii) at least one initial phase state; receiving, from the receiving end on a classical channel, time state location information for selecting a specific initial time state for encoding of information transmitted to the receiving end; selecting the specific initial time state for the encoding, on the basis of the time state location information: generating an encoding time state by encoding the information on the basis of the selected specific initial time state, the encoding time state being generated by applying a time shift on the basis of a value of the information being encoded; and transmitting a message including the encoding time state to the receiving end through the quantum channel, wherein the message is restored on the basis of a time difference between information on the at least one initial time state stored in the receiving end and information on the encoding time state.

The present application belongs to the technical field of quantum communication, and discloses a device-independent quantum secret sharing method based on multi-photon entanglement, which requires a key sender to prepare a large number of identical three-photon GHZ states, and to send two photons in each GHZ state to two key receivers respectively; after receiving the photons, the three parties randomly select measurement bases to measure the adversary's photons, and publish the measurement bases and part of the measurement results, so as to estimate the values of Svetlichny polynomials and CHSH polynomials; the security of the transmitted key is ensured by Svetlichny inequality violation and CHSH inequality violation. The present application can resist all attacks from imperfect device ends, reduce the requirement for the security of experimental equipment, effectively enhance the security of QSS under actual experimental conditions, and has important application in the field of future quantum secure direct communication.

The application discloses a quantum secure direct communication method based on passive coding. An information receiver uses two phase random coherent pulses to generate weak coherent pulses in different quantum states through CPBS beam combination and BS attenuation. The information receiver inputs the state of one port output of the BS into a PBS, measures the light intensity ratio of two output ports of the PBS, obtains the state information of the pulse output from the other port of the BS, and sends the state to be sent to an information sender according to the information. The information sender sends the photon pulse back to the information receiver after coding. The information receiver decodes the information sent by the information sender according to the initial pulse information sent by the information receiver. The method does not need to actively modulate the initial quantum state of the light source, realizes passive coding, simplifies the experimental operation, resists side channel attacks of a third-party eavesdropper on the light source modulator, and enhances the communication security.

The application discloses a three-party quantum secure direct communication method with identity authentication function, which realizes three-party quantum secure direct communication with identity authentication function by using polarization-space hyper-encoding single photons; first, Alice prepares polarization-space hyper-encoding single photons and sends the single photons to Bob'1, and the identity of Bob'1 is determined through identity authentication; after the identity of Bob'1 is determined, Bob'1 encodes the single photons in the polarization degree of freedom; then the photon sequence is sent to Bob'2, and the identity of Bob'2 is determined through identity authentication; after the identity of Bob'2 is determined, Bob'2 encodes the single photons in the space degree of freedom; after the encoding is completed, the encoded single photons are re-sent to the information receiver; Alice can obtain the secret information transmitted by the two information senders at the same time through measurement; compared with the previous three-party quantum secure direct communication scheme, the present scheme determines the identities of the two information senders before realizing information transmission, and can effectively improve the security of communication in the actual experimental environment, and has important application in the field of quantum communication.

The application discloses a kind of measurement equipment independent quantum secure direct communication methods based on quantum walk, including encoding in position space in position state and in hardware space in coin state;It is obtained based on quantum walk on straight line that shared entangled state is used as quantum channel;The shared quantum channel is re-described and measured;Quantum channel is detected and the security of quantum channel is judged;Sender and receiver measure and entangle through third party;Sender and receiver confirm the security of quantum channel again;The particle of sender and receiver is merged to obtain composite quantum state;Second quantum walk is carried out to obtain the quantum entangled state of sender and receiver;Sender carries out projection measurement on quantum entangled state and sends the measurement result to receiver, and completes the final measurement equipment independent quantum secure direct communication.The application can realize measurement equipment independent quantum secure direct communication, and reliability is high, and security is good.

This invention belongs to the field of quantum communication technology and discloses a measurement-device-independent multi-party quantum secure direct communication method based on hyperentanglement. This method uses polarization-space hyperentanglement to construct a hyperentangled channel through hyperentanglement exchange, enabling users 1, 2, 3, and 4 to simultaneously transmit secret information to user 5. All measurements in this method are performed by an untrusted measurement terminal. User 5 can derive the coded information of other users based on the three rounds of hyperentangled Bell state measurements made by the measurement terminal, thus achieving multi-party quantum secure direct communication. Compared with existing two- and three-party quantum secure direct communication schemes, this method increases the number of communicating parties and improves the communication efficiency of quantum secure direct communication. Furthermore, this method can resist all attacks from the measurement terminal, enhancing the security of multi-party quantum secure direct communication under practical experimental conditions.

The application provides a method for continuous variable quantum secure direct communication, and belongs to the technical field of quantum secure direct communication, and comprises the following steps: a sending end prepares a double-mode compressed entangled light beam pair S, and sends a light beam S1 to a receiving end; the sending end modulates the light beam S1 into a first Laguerre-Gaussian light beam S'1 and sends the light beam S'1 to the receiving end; the sending end selects a subset, measures the orthogonal position and the orthogonal momentum of a light beam S2 in the subset, and compares the measurement result of the light beam S1 with the receiving end to check interference; the receiving end modulates the S'1 into a second Laguerre-Gaussian light beam S''1 according to secret information, and sends the S''1 to the sending end; the sending end recombines the S2 and the S''1 into a light beam pair S' and images, and obtains the secret information according to the imaging result. The application solves the problems that the continuous variable quantum secure direct communication is prone to noise and loss in the transmission process, and the implementation and management are complex.

A controlled quantum secure direct communication method based on multiple groups of Bell bases comprises the following steps: a third party prepares a series of entangled photon pairs to form two photon sequences, and the two photon sequences are respectively sent to two communication parties; and the two communication parties select photons on the photon sequence for two rounds of safety detection. And the third party publishes a preparation base of the entangled photon pair, and an information receiver performs Bell state measurement and records a result according to the preparation base. An information sender publishes random coding positions and coding information, a third party publishes initial states on the positions, a receiver performs second round of security detection, and it is indicated that the channel is free of eavesdropping when the bit error rate is lower than a threshold value. And finally, the third party publishes the initial states of other positions, and the receiver deduces the information to be transmitted by the sender according to the Bell state measurement result. According to the method, only the Bell state needs to be used for communication, and only two rounds of transmission and two rounds of security detection are needed, so that the implementation complexity of a protocol can be reduced, and the communication efficiency is improved.

Disclosed are a secure communication method and apparatus, a network device, a computer storage medium and a program product, the method comprising: sending a first authentication certificate to a second network function and receiving a second authentication certificate sent by the second network function, the first authentication certificate being used for the second network function to authenticate a first network function, and the second authentication certificate being used for the second network function to authenticate a second network function; the second authentication certificate is used for the first network function to authenticate the second network function, and the first authentication certificate and the second authentication certificate are signed and issued by a certificate authority (CA) center; if the mutual authentication between the first network function and the second network function is passed, negotiating a security parameter between the first network function and the second network function through a quantum secure direct communication mode, and generating a session key by using the security parameter, the session key being used for performing secure communication of messages between the first network function and the second network function; thus, secure communication between the first network function and the second network function is realized.

The objective of the present disclosure is to perform asynchronous measurement device independent quantum secure direct communication (AMDI QSDC) by using an intermediate node in a communication system. The present disclosure may comprise the steps of: acquiring system information; performing an initial access procedure on the basis of the system information; transmitting a first signal for measurement to a second device; receiving information related to a measurement result from the second device; generating, on the basis of the information related to the measurement result, data signals on which data encoding has been performed; and transmitting the data signals to the second device.

The application discloses a quantum secure direct communication method based on a symmetric passive light source, wherein information receivers use four phase random coherent pulses to generate weak coherent pulse beams with random intensity and quantum state through beam splitters and polarization beam splitters interference, beam combination and attenuation, and send the beams to information senders. The information senders send the photon pulses back to the information receivers after encoding. The information receivers decode the information sent by the information senders according to the initial pulse information sent by the information receivers. The method does not need to actively modulate the intensity and quantum state of the light source, can simultaneously realize passive decoy states and passive encoding, can simplify experimental operation, can resist side channel attacks of a light source modulator by a third-party eavesdropper, and can enhance the security of quantum secure direct communication.

The present application relates to a quantum secure direct communication method and apparatus based on a one-way transmission, a device and a system. The transmitting terminal performs the error-correction anti-loss encoding on the to-be-transmitted message to obtain the code word corresponding to the to-be-transmitted message. The encryption key negotiated with the receiving terminal is adopted to encrypt the code word and the ciphertext message corresponding to the code word is obtained. Further, the ciphertext message is encoded onto the quantum state, and the obtained quantum state information is transmitted to the receiving terminal through the quantum channel.

The application discloses a quantum secure direct communication method and system based on passive decoy state, wherein an information receiver uses two phase random coherent pulses, the two coherent pulses are interfered and attenuated through a beam splitter to generate a weak coherent pulse light beam with random intensity; the information receiver further randomly encodes the weak coherent pulse and sends the same to an information sender; the information sender sends the photon pulse back to the information receiver after information encoding; and the information receiver decodes the information sent by the information sender according to the initial pulse information sent by the information receiver. The method does not need to actively modulate the intensity of a light source, can realize passive decoy state, can be realized by using linear optical devices, simplifies experimental operation, can resist side channel attacks of a light source modulator by a third-party eavesdropper and can enhance the security of quantum secure direct communication.

The application discloses a quantum secure direct communication method based on quantum walk, which comprises the following steps: encoding an initial state of a quantum walk system; performing one-step quantum walk based on a directed ring graph to obtain a shared entangled state; re-describing a quantum channel shared by a sender and a receiver; the sender performs measurement based on a position-based measurement basis and sends the measurement result to the receiver; the receiver performs corresponding measurement based on a coin-based measurement basis; the sender and the receiver compare measurement results to realize channel judgment; a composite quantum state is calculated; the second-step quantum walk based on the directed ring graph is performed to obtain a final quantum entangled state; the sender performs projection measurement and transmits the receiver; the receiver performs measurement and acquires secret information, thereby completing the quantum secure direct communication based on the quantum walk. The application avoids the advance preparation of the entangled state, avoids the security risk in particle distribution, has higher measurement efficiency and is easier to realize in experiments, and is high in reliability, security and efficiency.

According to various embodiments of the present disclosure, an operation method of a first node in a communication system is provided, the method comprising the steps of: transmitting at least one synchronization signal to a second node; transmitting a control signal to the second node; transmitting, to the second node, a first quantum key packet including a first private key of the first node and a first quantum key based on a key pre-shared between the first node and the second node; receiving, from the second node, a second quantum key packet including a second private key of the second node and a second quantum key based on the pre-shared key; acquiring a first quantum master key based on a first operation and a second operation on the second quantum key, the first operation being on the basis of the first private key and the second operation being related to compensation of the pre-shared key; transmitting, to the second node, a first quantum authenticated secure message in which first message information is encoded on the basis of the first quantum master key; and receiving, from the second node, first feedback related to a first error of the first message information.

The application discloses a kind of quantum secure direct communication methods based on one-time one secret mode, belong to quantum communication technical field, including the following steps: Bob prepares a batch of coherent state and sends to Alice through quantum channel, Alice will received coherent state be divided into two groups, to one group is executed homodyne detection, and detection result is sent to Bob, and Bob carries out safety detection according to the first effective information quantity;Alice encodes coherent state according to secret information, and sends to Bob after encoding, Bob randomly selects one coherent state and executes homodyne detection, and result is sent to Alice, and Alice carries out safety detection according to the second effective information quantity;Bob executes homodyne detection to the rest of coherent state and calculates threshold value, and demodulation is obtained secret information;The application uses continuous variable quantum state, easy to produce and detect, small in transmission process loss, high security, can be compatible with standard telecommunication technology.

The invention discloses a method and a system for indicating quantum secure direct communication based on compression state superposition, and belongs to the technical field of quantum communication. The method comprises the following steps: generating signal state photons by using a compressed state superposed indication single photon source, and generating a photon sequence SA through random coding; an information sender selects a part of photons as first-round safety detection photons, randomly selects a measuring machine for measurement, and publishes a measurement base and a measurement result; the information receiver performs a first round of safety detection; if the first round of security detection is passed, the information sender extracts the remaining photons, selects one part to carry out random coding, and carries out information coding on the other part to generate a photon sequence SB; the information receiver receives and stores the photon sequence SB; the information receiver extracts the security detection photons to perform a second round of security detection; and if the second round of security detection is passed, the information receiver extracts residual information coding photons from the photon sequence SB and deduces the information sent by the information sender according to the residual information coding photons.

The present invention discloses a semi-quantum secure direct communication method that is resistant to collective phase shift noise and collective rotation noise. According to the characteristics of the six-qubit decoherence-free state, a new coding mapping rule is proposed to help a classical sender to securely transmit secret messages to a quantum receiver in a quantum channel containing collective noise without interference. Secondly, in the secret message transmission stage, the message authentication technology in classical cryptography is introduced to implement secondary encryption of the secret message to ensure the authenticity and integrity of the secret message. Finally, the secret message is recovered by six single-particle measurement technologies, which is highly feasible.

A communication method for quantum direct communication and quantum direct communication system, an electronic device and a non-transitory computer-readable storage medium. The quantum direct communication method is applied to a sender of the quantum secure direct communication system. The communication method includes: encrypting a transmitted message by using an encryption algorithm to obtain a ciphertext corresponding to the transmitted message; encoding the ciphertext into a quantum state through a quantum direct communication terminal of the sender according to a quantum communication protocol; and sending the quantum state to a receiver of the quantum direct communication system. According to some embodiments, by utilizing the encryption algorithm to encrypt the transmitted message, the capability of eavesdropper detection is provided for ciphertext transmission, reducing the risk of messages being intercepted by eavesdroppers. Meanwhile, the security of quantum direct communication systems constructed with non-ideal devices is strengthened.