32 results about "BB84" patented technology

The invention discloses a wireless transmission anchor rod multipoint stress sensor system, which relates to the technical field of intelligent monitoring of geotechnical engineering and comprises a data sensing and acquisition module, a data processing and transmission module, a data receiving and storage module, a data analysis and decision module and a user interaction and management module. The technical key points are as follows: multi-protocol adaptive communication and quantum encryption are carried out, a multi-protocol adaptive communication stack is based on an improved near-end strategy optimization algorithm, intelligent switching of communication protocols can be completed in an extremely short time according to an actual environment, and the intelligent switching of the communication protocols can be completed in scenes such as mountainous area tunnels with complex and changeable signals. The problem that transmission of a traditional single protocol is prone to being interrupted is effectively avoided, continuity of data transmission is guaranteed, meanwhile, the integrated quantum key distribution unit adopts a BB84 protocol and is combined with a two-factor encryption system, data transmission safety is remarkably improved, quantum attacks can be effectively resisted in a monitoring scene with the extremely high requirement for data safety in confidential work, and the security of data transmission is improved. And the data leakage risk is avoided.

The invention relates to the technical field of communication, in particular to an optical service unit physical layer encryption system which comprises a sending end and a receiving end, the sending end and the receiving end are connected through a quantum channel and a classic channel respectively, a quantum random key is sent and transmitted through the quantum channel, and a conventional signal is transmitted through the classic channel; specifically, time domain scrambling processing is carried out on an optical signal of an optical service unit, and key distribution is realized by adopting a bait state BB84 protocol and a polarization coding method so as to provide a seed key. Under the condition of real-time secret key updating, in the process of accessing the side M-OTN network, safe end-to-end data transmission of the optical physical layer of the M-OTN network is realized. According to the invention, unpredictable time domain scrambling becomes an effective and flexible high-speed optical signal scrambling method, so that the safety and reliability of the M-OTN optical physical layer are enhanced.

The application discloses an encryption method fusing quantum key and post-quantum cryptographic algorithm, and belongs to the technical field of data encryption. The original quantum key is generated by a BB84 protocol QKD device, and a post-quantum key generation seed, a lattice noise scaling factor and a quantum enhanced session base key are obtained through hash derivation; quantum derived mask is generated by combining the original quantum key and the operation data characteristics of the water and power terminal; the quantum mask protection data is obtained by performing XOR preprocessing on the data to be encrypted; based on the post-quantum encryption algorithm, the two-part basic ciphertext is generated by using the above-mentioned seed, parameters and protection data; the original quantum key is divided into pieces to obtain quantum enhanced encryption values, and the two-part ciphertext is subjected to secondary disturbance encryption and XOR processing, thereby forming enhanced ciphertext; and finally, the enhanced ciphertext and the check code are spliced and transmitted to the central control room. Through multi-level encryption and key enhancement, the security and attack resistance of data transmission in the water and power terminal and the like are significantly improved.

The invention discloses a quantum key distribution eavesdropping detection system and method based on an improved BB84 protocol and an AI doorkeeper, and the method comprises the steps: adding two new polarization bases on the basis of two polarization bases of a rectangular coordinate system L and a diagonal coordinate system N of the BB84 protocol, and forming a set of four polarization bases; an LSTM network based on a self-attention mechanism and an SVM optimized through principal component analysis are adopted to carry out eavesdropping detection at the same time, and detection results of the eavesdropping detection and the SVM optimized through principal component analysis are fused to obtain probability distribution of attack existence. According to the invention, the security and practicability of the BB84 protocol can be improved, and the eavesdropping detection capability and efficiency of an AI entrance guard can be enhanced. According to the method, the performance of the light source and the detector is further optimized, the single-photon source closer to the ideal and the high-efficiency and low-noise single-photon detector are adopted, the misjudgment and information leakage risks can be further reduced, and the accuracy and the detection rate of eavesdropping detection can be further improved by optimizing the SVM through grid search.

The application discloses a photon intensity control method and device of a BB84 decoy state quantum key distribution system, and relates to the technical field of quantum communication photon intensity control. The photon intensity control method comprises the following steps: detecting the photon intensity of the photon state of a first beam splitting ratio after beam splitting; determining the average photon number ratio of the photon state according to the photon intensity of the photon state and the trigger number of the photon state; determining the control signal of the photon state according to the average photon number ratio of the photon state; and controlling the photon intensity of the photon state of a second beam splitting ratio after beam splitting in response to the control signal of the photon state, so as to control the photon intensity of the photon state of the second beam splitting ratio of the BB84 decoy state quantum key distribution system. The photon intensity control method can accurately control the photon intensity of the signal state, the photon intensity of the decoy state and the photon intensity of the vacuum state, and improve the feedback control precision.

The invention belongs to the technical field of quantum security communication, and discloses a miniaturized quantum key distribution system and method, a system transmitting module and a receiving module perform quantum signal transmission through a free space, classic communication is completed through a public channel, and the system realizes generation and updating of a shared key based on a polarization coding BB84 protocol. The transmitting module comprises an LED array, a driving circuit and a beam combining and collimating module, and the receiving module comprises a focusing and beam splitting module, a single-photon detection array module and an acquisition and processing circuit. Compared with the prior art, commercial ready-made components are adopted, the hardware cost is greatly reduced, and the problem that an existing system is high in price is solved; the system can be integrated into a handheld device, and the portable requirement of consumer-level applications is met; through narrow-band filtering, temperature control and dynamic door width adjustment, stable work under the shadow sunlight condition is realized, and the application scene is expanded; and continuous security assurance is realized through regular key recharging, and civilization of the quantum encryption technology is promoted.

The invention discloses a photon intensity control method and device of a BB84 decoy state quantum key distribution system, and relates to the technical field of quantum communication photon intensity control. The photon intensity control method comprises the following steps: detecting the photon intensity of a photon state of a first beam splitting ratio after beam splitting by a beam splitter; determining an average photon number ratio of the photon states according to the photon intensity of the photon states and the respective triggering number of the photon states; determining respective control signals of the photon states according to the average photon number ratio of the photon states; and in response to respective control signals of the photon states, controlling the photon intensity of the photon state of the second beam splitting ratio after beam splitting by the beam splitter so as to control the BB84 decoy state quantum key distribution system according to the photon intensity of the photon state of the second beam splitting ratio. According to the photon intensity control method, the photon intensity of a signal state, the photon intensity of a decoy state and the photon intensity of a vacuum state can be accurately controlled, and the feedback control precision is improved.

The invention discloses an implementation method for fusing a quantum key and a post-quantum cryptographic algorithm, and belongs to the technical field of data encryption. The method comprises the following steps of: generating an original quantum key through BB84 protocol QKD equipment, and generating a seed, a lattice noise scaling factor and a quantum enhancement session base key by a post-quantum key obtained through Hash derivation; generating a quantum derived mask in combination with hydroelectric terminal operation data characteristics and an original quantum key, and performing XOR preprocessing on to-be-encrypted data to obtain quantum mask protection data; based on a post-quantum encryption algorithm, generating two parts of basic ciphertexts by using the seeds, the parameters and the protection data; fragmenting the original quantum key to obtain a quantum enhanced encryption value, and respectively performing secondary disturbance encryption and XOR processing on the two parts of ciphertexts to form enhanced ciphertexts; and finally, the enhanced ciphertext and the check code are spliced and then transmitted to a central control room. According to the invention, through multi-stage encryption and key enhancement, the security and anti-attack capability of data transmission in scenes such as a hydropower terminal and the like are significantly improved.

The invention discloses a dam monitoring system data encryption transmission method based on a quantum key, and belongs to the technical field of data encryption. The method comprises the following steps: generating a basic quantum key based on a BB84 protocol, and partitioning to obtain key segments; collecting multiple types of operation state data of the dam, binding time-space information, and generating a security situation characteristic factor for a data numerical value; a derivative key is generated by combining the space-time binding identifier, the feature factor and the key segment, an independent encryption state key is obtained through disturbance shift, and a joint enhanced key is obtained through multiple rounds of enhancement; and finally, completing data encryption by adopting two types of keys. According to the method, the security of dam monitoring data transmission is improved through a quantum key in combination with a time-space and security situation layered encryption mechanism.

The invention provides a key generation method and device based on a BB84 protocol, equipment and a medium. The key generation method comprises the steps of obtaining an intermediate key; performing blocking processing on the intermediate key according to a blocking rule to obtain a first key block and a second key block; processing the first key block to obtain an initial key; processing the second key block to obtain a third key block; key derivation is carried out according to the initial key and the third key block, a quantum key is generated, and the problem that consumption of quantum communication resources is too large due to an existing key generation method is solved.

The embodiment of the invention provides a quantum key real-time simulation software architecture based on a BB84 protocol. The management layer is used for determining simulation sender equipment and simulation receiver equipment; the transmission layer is used for generating an analog quantum channel and an analog classic channel; the quantum layer is used for sending and measuring analog quantum state information and determining a first analog base sequence, a first analog original key sequence, a second analog base sequence and a second analog original key sequence; asynchronously sending the first analog base sequence and the second analog base sequence to an analog classic channel; sending the first simulation original key sequence and the second simulation original key sequence to a post-processing layer through a preset internal channel; and the post-processing layer is used for determining an analog quantum key according to the base sequence and the key sequence. Through the modular design of the management layer, the transmission layer, the quantum layer and the post-processing layer, the real-time verification capability and the dynamic scene adaptability of the quantum key distribution simulation system are improved.

This patent discloses a resource allocation method based on link influence in a dual-protocol quantum optical network. This method is mainly aimed at the application scenario of a dual-protocol QKD optical network based on BB84 and SNS, and solves the resource competition problem between the two quantum key distribution services and data communication services. This method fully considers the characteristics of the two protocols, and proposes an SNS wavelength allocation method based on link influence and a fiber core allocation method for reserved quantum cores, which can effectively improve the QKD performance in the network. The method proposed by the present invention helps to promote the development of quantum key distribution optical networks in which multiple protocols coexist, laying the foundation for their widespread application.

The present application provides a key generation method, apparatus, device, and medium based on the BB84 protocol, comprising: obtaining an intermediate key; performing block processing on the intermediate key according to a block rule to obtain a first key block and a second key block; processing the first key block to obtain an initial key; processing the second key block to obtain a third key block; and performing key derivation based on the initial key and the third key block to generate a quantum key, thereby solving the problem of excessive consumption of quantum communication resources caused by current key generation methods.

This invention relates to quantum key distribution, specifically to a BB84 quantum key distribution system and method based on passive polarization coding, including a transmitter Alice, a receiver Bob, and a quantum channel. The transmitter Alice includes a passive coding transmitter, which comprises a predictive single-photon source module and a fully passive polarization coding module. The predictive single-photon source module generates signal-idle single-photon pairs. The signal photon is detected by a single-photon detector, and its detection event serves as the prediction time reference for the entire system. The idle photon enters the fully passive polarization coding module. The fully passive polarization coding module randomly assigns the idle photon to the corresponding optical path and maps it to one of the four polarization states of BB84 within the optical path, while making each polarization state correspond to a fixed time delay, forming a time delay tag. The technical solution provided by this invention can effectively overcome the shortcomings of existing technologies that are difficult to simultaneously achieve complete passivity, high security, low system complexity, and engineering practicality.

The invention belongs to the field of data encryption transmission, and particularly discloses a black box data transmission method based on quantum key encryption, and the method comprises the steps: generating a quantum key, carrying out the post-processing of the quantum key, and carrying out the data transmission based on the quantum key. According to the scheme, the quantum key encryption technology is adopted, and the encryption security is improved by using the unclonable principle of quantum and the uncertainty of quantum state; a quantum key is generated based on an improved BB84 quantum cryptographic protocol, a safe public two-way communication channel is established with a receiver to transmit the quantum key, and the safety of black box data in the transmission process is guaranteed; a substitution box is designed to perform confusion transformation on a quantum key, an initial substitution box is generated by using discrete chaotic mapping, and the substitution box is optimized through a migrant bird search algorithm, so that the security of the key is enhanced, and the noise resistance of data transmission is improved.

The present invention relates to a system for encoding and correcting the polarization state of the BB84 protocol that implements a method of measuring polarization errors based on performing measurements prior to an information transmission step, which method is applicable to any system in which quantum key distribution (QKD) is to be implemented.

The invention provides a low-frequency synchronization signal synchronization method, device and equipment based on a BB84 protocol, and relates to the technical field of quantum communication. The method comprises the following steps: generating a high-frequency reference signal and a low-frequency synchronization signal; triggering a first group of random coding bases to perform quantum state coding on the to-be-sent information according to the high-frequency reference signal; transmitting a quantum state code to a receiving end according to the frequency of the high-frequency reference signal; modulating the low-frequency synchronizing signal to a preset optical carrier and transmitting the modulated low-frequency synchronizing signal to a receiving end, extracting the low-frequency synchronizing signal by the receiving end, performing frequency conversion on the low-frequency synchronizing signal according to the frequency of the high-frequency reference signal to generate a target high-frequency signal, and triggering a second group of random coding bases to decode the quantum state code by the target high-frequency signal to obtain decoding information; and negotiating the first group of random coding bases, the second group of random coding bases, the to-be-sent information and the decoding information with a receiving end to generate a quantum key. According to the invention, the bit error rate and the eavesdropping misjudgment risk can be reduced.

The application discloses a kind of big dam monitoring system data encryption transmission methods based on quantum key, belong to data encryption technical field.The application is based on BB84 protocol first to generate basic quantum key and block to obtain key segment;Collect big dam multi-class operating state data and bind space-time information, generate security posture characteristic factor for data value;Derivative key is generated in combination with space-time binding identifier, characteristic factor and key segment, independent encrypted state key is obtained by perturbation shift, combined enhanced key is obtained by multiple rounds of enhancement;Finally, two types of keys are used to complete data encryption.The application improves the security of big dam monitoring data transmission through the layered encryption mechanism of quantum key combined with space-time and security posture.

The application provides a novel arbitration quantum signature method based on Bell states, which is used for improving the security performance of AQS; the steps are as follows: firstly, a specific Bell state is encoded by the hash function output value of a message; secondly, the signature sender, the signature receiver and the arbitration management party exchange the encoded Bell state sequence in a specific way; the signature sender and the signature receiver respectively encrypt the measured results of the exchanged Bell state by using different keys, and send the ciphertext to the arbitration management party; finally, the arbitration management party verifies the signature legality by searching a specific table. The application performs digital signature based on Bell quantum states, BB84 protocol and quantum one-time encryption and decryption algorithm, and has formal security proof.

An embodiment of the present invention provides a real-time quantum key simulation software architecture based on the BB84 protocol. The architecture includes: a management layer for determining a simulated sender device and a simulated receiver device; a transport layer for generating a simulated quantum channel and a simulated classical channel; a quantum layer for sending and measuring simulated quantum state information and determining a first simulated base sequence, a first simulated original key sequence, a simulated second simulated base sequence, and a second simulated original key sequence; and asynchronously sending the first simulated base sequence and the second simulated base sequence to the simulated classical channel; sending the first simulated original key sequence and the second simulated original key sequence to a post-processing layer via a preset internal channel; and a post-processing layer for determining a simulated quantum key based on the base sequence and the key sequence. Through the modular design of the management layer, transport layer, quantum layer, and post-processing layer, the real-time verification capability and dynamic scenario adaptability of the quantum key distribution simulation system are improved.

The invention discloses a database synchronous comparison method based on BB84 coding and a comparison system thereof, and the comparison method comprises the steps: firstly generating associated bit strings among a first database, a second database and an authentication server through employing a quantum secret sharing technology and a quantum key distribution technology; and a secret key is generated between the first database and the second database, and then a synchronous comparison process is carried out, so that the data synchronous comparison process has unconditional security. According to the method, synchronous comparison of the data can be completed under the condition that specific information of the data is not leaked to any participant, the safety of the privacy data of the user in the updating process is guaranteed, the safety is guaranteed through the quantum mechanics basic principle, and therefore it is guaranteed that the database which is not authorized cannot obtain updating information.

The present invention relates to a transmitter (1000) for a BB84 protocol, comprising a laser (1100) configured to generate a first light pulse (P1) having a first duration (Tp1), a modulator (1200) configured to modulate an intensity of the first light pulse (P1) so as to obtain a second light pulse (P2) having a second duration (TP2) smaller than the first duration (TP1) and / or a third light pulse (P3) having a third duration (TP3) smaller than the first duration (TP1). Further embodiments relate to methods for operating the transmitter (1000).

The present invention relates to a transmitter (1000) for a BB84 protocol, comprising a laser (1100) configured to generate a first light pulse (P1) having a first duration (TP1),a modulator (1200) configured to modulate an intensity of the first light pulse (P1) so as to obtain a second light pulse (P2) having a second duration (TP2) smaller than the first duration (TP1) and / or a third light pulse (P3) having a third duration (TP3) smaller than the first duration (TP1). Further embodiments relate to methods for operating the transmitter (1000).

The application discloses a kind of measurement equipment independent quantum conversation methods with bidirectional identity authentication function, the method is mutually authenticated whether communication two sides are legal collaborators, then directly utilize quantum channel to mutually converse each other.Communication two sides Alice and Bob mutually share a set of identity keys by BB84 protocol, Alice and Bob are only responsible for preparing entangled photon pair and single photon, and performing encoding operation to photon, all measurement tasks are completed by third party measurement end Charlie.Alice and Bob can verify the identity of two sides according to the Bell state analysis result of Charlie, determine as the legal party of communication, and complete bidirectional communication after that.The application first applies bidirectional identity authentication technology to MDI-QD field, can resist the impersonation attack of eavesdropper, and by completing measurement task by third party, can effectively resist all attacks to imperfect measurement equipment, enhance the security of two-way identity authentication code and communication.The application has very important significance to promote the practical application of quantum conversation.

The invention discloses an intelligent encryption communication method and system based on a quantum key, and relates to the technical field of quantum communication encryption, and the system comprises a quantum key generation module which uses a quantum channel to execute a BB84 protocol to generate a quantum key, employs a phase coding technology, is equipped with a quantum error correction coding technology, carries out the coding of the generated quantum key, and carries out the encryption of the quantum key; transmission errors are corrected, and key reliability is improved. According to the invention, the encryption system uses the quantum channel to execute the BB84 protocol to generate the quantum key, based on the uncertainty principle and the unclonable theorem of quantum mechanics, the encryption system has the theoretically unconditional security characteristic, and the non-eavesdropping property and the unclonability of the quantum key provide higher-level guarantee for communication security. A phase encoding technology and a quantum error correction encoding technology are adopted, so that environmental noise interference can be effectively resisted, quantum bit errors are corrected, the stability and reliability of key transmission are improved, and the accuracy and safety of keys are ensured.

The present invention belongs to the field of data encryption transmission, and specifically discloses a black box data transmission method based on quantum key encryption, the method comprising: generating a quantum key, post-processing the quantum key, and transmitting data based on the quantum key. This scheme adopts quantum key encryption technology, and utilizes the quantum non-cloning principle and the uncertainty of the quantum state to improve the security of encryption; adopts the quantum key generated based on the improved BB84 quantum cryptographic protocol, establishes a secure public two-way communication channel with the receiver to transmit the quantum key, and ensures the security of the black box data during the transmission process; designs a substitution box to perform confusion transformation on the quantum key, uses discrete chaotic mapping to generate an initial substitution box, and optimizes the substitution box through a migratory bird search algorithm, thereby enhancing the security of the key and improving the resistance of data transmission to noise.

The invention discloses an all-passive quantum key distribution transmitting end chip based on a photon integration technology. The transmitting end chip is composed of a laser, a passive intensity modulation module, an intensity detection module, a polarization state passive modulation module, a polarization state detection module, an optical pulse safety truncation module and a data acquisition control unit based on an FPGA. All the modules are connected through optical waveguides. The transmitting end chip is characterized in that a passive modulation architecture is adopted, and the side channel attack risk caused by modulation of an active device is eliminated. The invention further discloses a quantum state modulation method of the all-passive quantum key distribution transmitting end chip. The all-passive quantum key distribution transmitting end chip is combined with a modulation method to realize high-speed, stable and safe quantum state coding. In addition, the transmitting end chip supports polarization coded BB84, MDI-QKD and other protocols, and the anti-interference capability and deployment efficiency of the system are remarkably improved.

The application belongs to the technical field of quantum secure communication, and discloses a miniaturized quantum key distribution system and method, wherein a system transmitting module and a system receiving module transmit quantum signals through free space, and complete classical communication through a public channel; the system generates and updates shared keys based on a polarization encoding BB84 protocol; the transmitting module comprises an LED array, a driving circuit and a beam combining and collimating module; the receiving module comprises a focusing and beam splitting module, a single photon detection array module and a collecting and processing circuit; compared with the prior art, the application uses commercial off-the-shelf components, greatly reduces the hardware cost, solves the problem of high price of the existing system, can be integrated into a handheld device, meets the portable demand of consumer-level applications, realizes stable operation under shadow sunlight conditions through narrowband filtering, temperature control and dynamic gate width adjustment, expands the application scenarios, realizes continuous security protection through regular key "recharge", and promotes the civilianization of quantum encryption technology.

The invention discloses a laser radar data secure transmission method and system based on quantum key distribution, and belongs to the technical field of quantum communication and laser radar data security, and the method comprises the steps: building a quantum key distribution channel between a collection end and a processing center, generating a shared key through a BB84 protocol, and storing the shared key in a key pool; when the point cloud data is transmitted, a one-time key is extracted for encryption and then is transmitted through a classic channel; a key consumption and supplement dynamic balance mechanism is innovatively designed, the key pool allowance is monitored, and supplement is triggered when the key pool allowance is lower than a threshold value; the method is suitable for high-security scenes such as military surveying and mapping, key infrastructure monitoring and the like.

The invention discloses a partial selection base BB84 quantum key distribution system and a signal equalization method thereof, and belongs to the field of quantum communication. The method comprises the following steps: dividing a quantum optical signal period T into two equal half periods T / 2 which are respectively used for high-level or low-level transmission; and meanwhile, an adopted level sequence modulation scheme is determined, namely, according to the level of the quantum light modulation electric signal, the levels of the two half periods are respectively determined, and the quantum light pulse is controlled to be aligned with the first half period. Direct-current balance is realized through half-cycle modulation, the problems of intersymbol interference and signal distortion in quantum signal transmission under the condition of an offset selection base BB84 protocol are effectively solved, and the bit error rate is reduced.