36results about How to "Reduce the risk of eavesdropping" patented technology

The invention discloses a task safety unloading method based on minimized time delay in an air-ground integrated Internet of Vehicles, which comprises the following steps: firstly, constructing an air-ground integrated Internet of Vehicles model supporting mobile edge computing; secondly, analyzing and modeling a safe transmission mode from a vehicle to an unmanned aerial vehicle edge server and a calculation mode of a local vehicle and the unmanned aerial vehicle edge server, and formalizing an air-ground integrated Internet of Vehicles task unloading problem to be related to edge server selection, a transmission rate, resource allocation and task unloading; solving a multi-objective optimization problem taking minimization of time delay as an objective in combination with a conditional relaxation numerical value reduction rule and a Lagrange dual decomposition method, so that the task processing time delay can be effectively reduced, and the successful task processing proportion is improved.

The embodiment of the invention relates to the technical field of wearing equipment, and discloses a method for controlling the wearing equipment and the wearing equipment. The method comprises the steps of starting a voice instruction recognition mode of the wearing equipment after a bone conduction trumpet of the wearing equipment is activated; under the voice instruction recognition mode of the wearing equipment, recognizing whether a voice instruction used for executing certain operation related to voice is received or not; if the voice instruction is received, triggering the wearing equipment to execute the certain operation related to voice; besides, controlling the bone conduction trumpet to transform a sound signal used for broadcasting a result or process when the wearing equipment executes the certain operation related to voice into a vibration signal and transmitting the vibration signal through bone media. According to the method for controlling the wearing equipment, the wearing equipment can be controlled conveniently, and the risk that voice broadcast by the wearing equipment is intercepted by surrounding people is reduced.

The invention provides a physical layer secure transmission method based on an unmanned aerial vehicle assisted cognitive wireless network, and belongs to the field of wireless communication. The method specifically comprises the following steps: establishing a wireless communication scene comprising an unmanned aerial vehicle, a primary user transmitter, a primary user receiver, a secondary userreceiver and an eavesdropper, and then, in a frequency spectrum sensing time tau of a time slot T, enabling the unmanned aerial vehicle to perform spectrum sensing, wherein the main user may perform data transmission, and calculates the safe transmission rate at the moment; meanwhile, in the data transmission time period Ta of the time slot T, enabling the unmanned aerial vehicle to judge the access state of the current main user channel based on spectrum sensing, selecting the current main user channel as a friendly interference unit or a secondary signal transmitter, and discussing a securetransmission model in four situations; based on this, formulating an optimization model of the total secure transmission rate; performing solving by using a particle swarm optimization algorithm; andenabling the unmanned aerial vehicle to perform signal physical layer safety transmission according to the obtained optimal parameters. According to the invention, the secure transmission of the primary and secondary users is considered, so that the secure transmission performance of the system is improved.

The invention provides a quantum communication method and communication network based on a secure relay; the method comprises the steps: the to-be-sent plaintext information is encrypted by a sender to generate an encrypted ciphertext; the sender sends the encrypted ciphertext to a relay node through a quantum communication protocol, so that the encrypted ciphertext is sent to a receiver through at least one relay node; and after receiving the encrypted ciphertext, the receiver decrypts the encrypted ciphertext to obtain the plaintext information. The encrypted ciphertext is transmitted step by step through at least one relay node and is not limited by the distance between a sender and a receiver, so that the encrypted ciphertext can be transmitted remotely. Meanwhile, before the information arrives at the receiver, the plaintext information is transmitted in the form of encrypted ciphertext and is not decrypted, so that the risk that the information is eavesdropped is reduced, and the security is improved.

The invention discloses a full duplex cognitive multiple-input-multiple-output relay cooperation method in a non-ideal channel state, and belongs to the technical field of multi-antenna full duplex wireless transmission. Firstly, according to a channel estimation model in a first time slot non-ideal channel state, a secondary user transmitter selects and configures an optimal antenna to send a signal to a secondary user relay node under a primary user interference temperature constraint condition, and a full duplex destination node transmits a directional interference signal to an eavesdropping user in a zero-forcing beamforming mode; then, according to a channel estimation model in a second time slot non-ideal channel state; and the secondary user relay node forwards data to the full-duplex destination node under the constraint condition of the interference temperature of the primary user, any LB antenna in the full-duplex destination node receives signals, and the remaining NB-LB antenna of the full-duplex destination node transmits artificial interference to an eavesdropping user. According to the method, the physical layer security transmission performance of the full duplex cognitive wiretapping network under the non-ideal channel is effectively improved, and the risk that the whole network system is wiretapped is reduced.

The invention relates to a block chain industrial data encryption method and device based on national secret and a storage medium, and the method comprises the steps: carrying out the key negotiation through employing a key exchange method based on an elliptic curve, and determining a shared key; negotiating and determining the current shared salt of the current round of data transmission; generating a current round transaction key based on the shared key and the current shared salt; the initiator encrypts the current round of to-be-delivered data by using the current round of transaction key and the SM4 national secret algorithm, and simultaneously uploads the current round of salted encrypted data and the current round of delivery hash value of the current round of to-be-delivered data to the block chain; and progressively increasing the current shared salt to obtain a next round of shared salt, generating a next round of transaction key according to the next round of shared salt and the shared key, and applying the next round of transaction key to a next round of data transmission process of the two communication parties. According to the method, the repudiation resistance, anonymity and integrity of the transaction can be enhanced, the continuous encryption delivery of the data on the block chain is realized, and the key leakage hazard can be reduced.

The invention belongs to the technical field of wireless communication, and discloses an NOMA multi-user secure computing unloading method and system, and the method comprises the steps: a user Un generates an original signal xn through channel coding and M-PSK modulation, and carries out the distributed preprocessing; the user group sends respective preprocessing signals to the computing node CN at the same time, and the computing node CN and the eavesdropper E both receive superposed signals from the user group; the computational nodes CN are arranged in a descending order according to the equivalent channel gains between the nodes and the users; the CN decodes the superposed signals in sequence after receiving the superposed signals; after an eavesdropper E receives the superposed signal, the superposed signal cannot be decoded due to a constellation diagram aliasing effect caused by distributed preprocessing. According to the method, the physical layer security performance of multi-user communication transmission can be improved, guarantee is provided for NOMA security transmission of a multi-user computing task, the eavesdropping risk is effectively reduced, and the network performance is improved.