114 results about "Quantum codes" patented technology

The invention discloses an end-to-end hand-held device encryption method based on quantum cryptography and a system. The encryption method comprises following steps of storing quantum keys; initiating a call; synchronizing the quantum keys; performing synchronous confirmation; answering the call; and performing encryption communication. In the encryption communication, an MCU of a main calling end injects quantum communication keys Ksa into an encryption and decryption model; an MCU of a called end injects the quantum communication keys Ksa into the encryption and decryption model; the MCU of the called end using the quantum communication keys to encrypt the data; the encrypted data is sent out via a radio frequency module of the called end; a radio frequency module of the main calling end injects the received encrypted data into the encryption and decryption model for decryption; and after being decrypted, the data is played by a loudspeaker of the main calling end or displayed via a touch type display. The invention also discloses an end-to-end hand-held device encryption system based on quantum cryptography. The encryption method and system are highly safe, independent and easy, quick and simple to deploy.

The invention manages to provide a stable and fast differential quantum key distribution method and system thereof. At transmitting end, with a continuous laser source, the quantum codes are prepared using two approaches: 1) using the beam-splitting, polarization-independent and phase-stabilizing approach to prepare the stable quantum code; 2) using polarization approach to directly prepare stable quantum code. At receiving end,differential phase-Faraday-Micheal test approach is used to directly receive the quantum information.

A network and a device can support secure sessions with both (i) a post-quantum cryptography (PQC) key encapsulation mechanism (KEM) and (ii) forward secrecy. The device can generate (i) an ephemeral public key (ePK.device) and private key (eSK.device) and (ii) send ePK.device with first KEM parameters to the network. The network can (i) conduct a first KEM with ePK.device to derive a first asymmetric ciphertext and first shared secret, and (ii) generate a first symmetric ciphertext for PK.server and second KEM parameters using the first shared secret. The network can send the first asymmetric ciphertext and the first symmetric ciphertext to the device. The network can receive (i) a second symmetric ciphertext comprising “double encrypted” second asymmetric ciphertext for a second KEM with SK.server, and (ii) a third symmetric ciphertext. The network can decrypt the third symmetric ciphertext using the second asymmetric ciphertext.

The present invention discloses a quantum cryptography implementation method based on a quantum light source. The method comprises the following steps: generating a labeled single photon source through a PDC process, transmitting signal light to a receiving end, and allowing casual light to be used for local detection. The local detection of the transmitting end comprises a beam splitter (BS), a detector D1 and a detector D2. The casual light passes by the beam splitter to trigger the two detectors to generate four different response events. The four different response events are recorded andused for estimation and processing the signal received by the receiving end, so as to extract a secret key. Due to the usage of a novel passive decoy method, the single photon response rate and bit error rate can be estimated accurately. With a low-loss unequal-arm MZ interferometer used, the consumption of the system is greatly reduced. The single-mode standard commercial light enables the QKD system transmission distance to be over 200 km and based on a quantum light source, so that the final secret key extraction rate is two orders higher than that in the previous QKD system using the quantum light source.

The invention relates to a fully-integrated high-speed single photon detecting system, comprising a precision clock source V1, wherein an output end of the precision clock source V1 is connected with an input end of an input filtering and amplifying module; an output end of the input filtering and amplifying module is connected with a temperature control module; an avalanche photodiode (APD) and a low noise direct current bias supply P1 are packaged in the temperature control module which is connected with an input end of an output filtering and amplifying module by a directional coupler; and an output end of the output filtering and amplifying module is connected with a counting module by a screening coincidence and dead time setting module. The invention also discloses a detecting method of the fully-integrated high-speed single photon detecting system. The fully-integrated high-speed single photon detecting system can strictly inhibit a back pulse effect, has a working frequency of 2 GHz and a counting rate of 100 MHz, is especially suitable for a quantum cryptographic system.

The invention provides a quantum key distribution method and system for authentication based on a post-quantum cryptography algorithm. The quantum key distribution system comprises a PQC authentication center, a PQC user side and QKD equipment. Communication in the quantum key distribution data post-processing process needs to be authenticated, a key presetting method is generally adopted at present, but the method is not suitable for a large-scale QKD network. According to the method and the system for authenticating the QKD by combining the PQC algorithm with the public key infrastructure, each user of the QKD network only needs to apply for one digital certificate from the authentication center, and the abstract of the authenticated information is signed and verified by using the PQC algorithm, so that the quantum-resistant computing security of the PQC algorithm in the authentication process can be ensured. And the operability and the flexibility of a large-scale QKD network are ensured.

An apparatus for quantum cryptographic communication includes a light source configured to generate an optical pulse which is transmitted to a plurality of quantum code sending devices, and a quantum entanglement measuring unit configured to receive the optical signal generated from each of the plurality of quantum code sending devices and measure a relation among quantum states of the optical signals received from the plurality of quantum code sending devices; the optical signal being generated by encoding a key to a quantum state of the optical pulse. The apparatus for quantum cryptographic communication may further include a signal direction determining unit, a reflector for reflecting the optical pulse or the optical signal, an arbitrary phase shifter, or a modulator for encoding a digital signal corresponding to the key to the optical pulse.

Systems, methods and computer program products are provided for layered quantum computing (QC) detection. An example system includes QC detection data generation circuitry that generates QC detection data via a first post-quantum cryptographic (PQC) technique. The system also includes cryptographic circuitry configured to generate a pair of asymmetric cryptographic keys including a public cryptographic key and a private cryptographic key via a second PQC technique, generate encrypted QC detection data based on the pair of asymmetric cryptographic keys, and destroy the private cryptographic key. The system further includes data monitoring circuitry configured to monitor a set of data environments for electronic information related to the encrypted QC detection data. In response to detection of the electronic information related to the encrypted QC detection data, the system may monitor a set of data environments for electronic information related to the QC detection data.

An information recording/reproducing method comprises several steps. Information to be recorded, a reading key that allows a person knowing the key to specify a base used for recording each bit and inhibits a person unknowing it from specifying the base, and an algorithm for determining the base from the key are prepared. A state to be created for each bit from quantum states is selected so as to satisfy the conditions. A measured value corresponding to the information to be recorded is acquired when a reading procedure corresponding to each base is performed. The measured value is not acquired when unitary transformation corresponding to a different base is performed. The quantum state in the recording medium is created. The state is kept, and each base is determined according to the key and performing the reading procedure corresponding to the base. Safety of the recorded information can be sufficiently secured.

Systems, apparatuses, methods, and computer program products are disclosed for post-quantum cryptography (PQC). An example method includes receiving data. The example method further includes receiving a set of data attributes about the data. The set of data attributes comprises one or more sets of data environment data attributes that are each representative of a set of data environments associated with the data. The example method further includes receiving one or more sets of data environment threat data structures associated with one or more data environments in the one or more sets of data environments associated with the data. The example method further includes selecting one or more cryptographic techniques for encrypting the data for at least the one or more data environments based on the set of data attributes, the one or more sets of data environment threat data structures, and a cryptograph optimization machine learning model.

The invention discloses an E-mail receiving and sending method and system based on post quantum and identity identification, and belongs to the technical field of secret communication. In the system, a KGC receives the identity identification sent by a user, generates a private key and returns the private key to the user; a sender sends an identity identifier to the KGC to obtain a sender private key, signs and encrypts a mail plaintext, and sends a mail ciphertext to a sender mail server; a sender mail server receives the mail ciphertext and delivers the mail ciphertext to a receiver mail server; a receiver mail server receives and stores the mail ciphertext; and a receiver sends the identity identifier to the KGC and obtains the private key of the receiver, receives the mail ciphertext from the mail server of the receiver and carries out decryption and signature verification on the mail ciphertext. According to the invention, based on the password system of the identity label, the defects of a complex public key acquisition mode and multiple authentication certificates are avoided; and meanwhile, a post-quantum cryptographic algorithm is combined, so that quantum computing attacks can be effectively resisted, and post-quantum secure communication is realized.

The invention provides a sending mail encryption method based on a quantum security key, which is applied to mail sending equipment. The method comprises the following steps that S1 ', before a mail is sent, mail sending equipment carries out identity verification through a quantum password management service system, the mail sending equipment reads a quantum security key preset in a built-in quantum security chip and carries out symmetric entity identity authentication with the quantum password management service system, and finally an authentication result is returned; S2 ', after the user completes login authentication in the step S1, when a mail needs to be sent, a sender needs to use a preset key in the quantum security chip to make an application for obtaining a mail encryption key to a quantum password management service system. By adopting the technical scheme, the threat of the environment with increasingly severe network attacks to the mailbox sending environment is solved, the security threat brought by a quantum computer and a quantum algorithm in the future is prevented, and the scheme is easy to implement.

The invention relates to a QKD System Active combiner (200) adapted to be installed in a QKD apparatus, said QKD apparatus comprising an emitter (100), a receiver (110) and QKD systems (102/112), wherein the emitter (100) is adapted to send communication signals to the receiver (110) through the QKD System Active combiner (200), characterized in that the QKD System Active combiner (200) comprises an active attenuation system comprising a processing unit (230) adapted to automatically control at least one variable optical attenuator (150) through a control channel (290) in order to control an attenuation of a signal to be sent to the receiver, and a detector/monitor (240) adapted to monitor the intensity of the signal downstream the attenuation, and wherein the processing unit is adapted to control the variable optical attenuator (150) based on a QBER information or an intensity of a signal received by the receiver, sent by the QKD systems (112) through a classical channel (250).

The invention belongs to the field of encryption communication of a quantum cryptography network, and provides a radio frequency identification authentication system and method based on the quantum cryptography network. The radio frequency identification authentication system based on the quantum cryptography network comprises a server, a reader, a quantum key card and a label, the ID of the reader and the corresponding authentication key thereof, and the ID of the tag and the corresponding authentication key thereof are stored in a database of the server; the server and the reader are respectively and correspondingly connected with the quantum key card, so that the server and the reader are subjected to identity bidirectional authentication through a quantum encryption channel; the reader and the tag communicate with each other through a radio frequency field, the server and the tag also adopt a bidirectional authentication mode to authenticate the identity, and when the bidirectional authentication of the identity between the reader and the server and the identity between the server and the tag succeeds, the radio frequency identification authentication succeeds.

Systems, apparatuses, methods, and computer program products are disclosed for PQC. An example method includes transmitting a first portion of an electronic communication to a client device over a non-PQC communications channel. The example method further includes transmitting a quantum cryptographic key to the client device over a quantum communications channel and authenticating a session with the client device over the non-PQC communications channel based on the quantum cryptographic key. Subsequently, the example method includes, in response to authentication of the session with the client device, transmitting a second portion of the electronic communication to the client device over a PQC communications channel. In some instances, the first portion of the electronic communication may comprise overhead data, and the second portion of the electronic communication may comprise payload data.

The invention provides a mail transmission system and a mail transmission method based on a quantum security key. The mail transmission system comprises a mail box system; a quantum random number generator; a quantum exchange cipher machine in which a secret key is pre-stored; a quantum key charging machine which is connected with the output end of the quantum exchange cipher machine; a quantum password management service system which is used for providing a mail encryption key and an identity authentication function; quantum security chips which are used for storing quantum security keys, the keys stored in each quantum security chip and the keys pre-stored in the quantum exchange cipher machine are symmetric keys, and symmetric entity authentication is carried out on the security keys in the quantum security chips through a network and a quantum cipher management service system; and a mail transceiver which is internally or externally connected with a quantum security chip. By adopting the technical scheme, the threat of an environment with increasingly severe network attacks to a mailbox transceiving environment is solved, the security threat brought by a quantum computer and a quantum algorithm in the future is prevented, and the scheme is easy to implement.

A photon pair generator includes a light source configured to emit light, and a nonlinear optical element configured to receive the light radiated from the light source and generate a quantum-entangled photon pair through spontaneous parametric down-conversion (SPDC), the nonlinear optical element including a polar material layer and a nonlinear material layer provided on the polar material layer.