40results about How to "Realize confidential communication" patented technology

A method for enciphering web-communication includes obtaining communication master cipher key provided from service end an storing said communication master cipher key by client end when first communication is carried out, only requiring to generate cipher key locally by calculation at service end when communication is carried out again, utilizing locally stored communication master cipher key to realize transmission of conversation cipher key by client end then using said conversation cipher key to carry out enciphering/deciphering on communication data by both parties for realizing secret communication.

The invention discloses a four-dimensional antenna array based secret communication system and a method thereof. The system basically comprises an antenna unit, a high-speed radio frequency switch, a high-precision local oscillation source, a power amplifier, a switch control circuit and the like. The system and the method are characterized in that a phase center of an array is moved by controlling of working time sequences of all array elements (or subarrays) in the antenna array, modulation of information is finished at an antenna end, signals which are required to be transmitted are synthesized in a specific direction only, signals which are required to be transmitted can not be synthesized in other directions, a plurality of modulation methods, such as quadrature phase shift keying (QPSK), binary phase shift keying (2PSK) and M spread spectrum sequences, can be achieved, and the structure of a transmitter can be simplified. Compared with traditional secret communication methods, the method is a novel physical layer encryption method and can effectively resist eavesdropping receivers in side lobe directions. The system and the method are applied to wireless communication systems.

The invention relates to a method for implementing encrypted communication for wireless LAN comprising (1) presetting identification information in encryption device, storing identification information in authentication device, establishing information table of corresponding relation of identification information and characteristic information in authentication device, connecting the access point and authentication device; (2) installing and operating dedicated drive program; (3) encryption device sending authentication request to authentication device; (4) the authentication device authenticating according to identification information, if the authentication being successful, then fetching corresponding characteristic information, transmitting the first key created from the characteristic information by the authentication device according to the algorithm to wireless access point, and transmitting to encryption device; (5) the encryption device acquiring characteristic information via wireless access point, and creating a key from the characteristic information according to same key creation algorithm; (6) wireless access point and encryption device encrypting and deciphering the transmitted data via the first key in wireless channel.

The invention discloses a secure communication system based on random time sequence four-dimensional circular ring array. The basic structure comprises a circular ring antenna array, a phase shifter,a time modulator, a pseudo-random time sequence generator, a circulator, a power amplifier, a transmitting combination success divider, a receiving common power divider, a transmitter, a receiver andthe like. The biggest innovation of the invention lies in that random time modulation is used, so that the antenna gain in a desired direction is not changed and the antenna gain in an undesired direction is not changed randomly. The method can be applied to all modulation systems based on amplitude and phase, such as BPSK, QPSK and the like. The circular ring array is introduced, so that omnidirectional secure communication can be realized. Compared with an existing secure communication mode based on a four-dimensional antenna array, the method provides a new random time modulation mode, onlyrandom and messy signals can be received in the unexpected direction, the problem that an existing system is insufficient in safety is solved, and full-airspace secure communication can be achieved.The present invention is used in a wireless communication system.

The present invention discloses a secret key distribution method based on an SIP communication system. The secret key distribution method is realized based on a communication system composed of a VOIP server, a secret key distribution server and a plurality of terminals, and is characterized in that the terminals send the calling request messages to the VOIP server, the VOIP server sends a secret key obtaining request message to the secret key distribution server, and the secret key distribution server utilizes the public keys of the terminals to generate the secret key data of the terminals and distributes the secret key data to the terminals via the VOIP server; after receiving the corresponding secret key data, the terminals utilizes the own private keys to decrypt the secret key data to obtain the session keys, and the calling and called terminals utilize the session keys to realize the secret communication. According to the present invention, a secret key distribution process is simplified, the secret key data is transmitted to the terminals by the SIP messages in communication connection without needing to increase the message number additionally, the real-time performance is stronger, and the secret communication of the terminals can be realized.

The invention relates to a secret communication method based on fraction order Fourier transform order-multiplexing, belonging to the information safety field. The secret communication method comprises the following steps: establishing linear equations by using the relation among filters in a multiplex transmission multiplexer accurately reestablished by fraction order Fourier domains with different orders and selecting discrete-sampling discrete fraction order Fourier transform as a basic tool, realizing the demodulation of the fraction order Fourier transform order-multiplexing; and realizing effective recovery of transmission information by using the multiplexed fraction order Fourier transform order as a secret in the information decryption. The secret communication method based on thefraction order Fourier transform order-multiplexing completely utilizes the order change characteristic of the fraction order Fourier transform, enlarges the secret space relative to the traditionalsecret communication method based on fraction order Fourier transform, improves the safety of the system, can realize secret communication under a multi-carrier mode, and can provide a new way for thedesign of a multi-user communication system.

The invention discloses a multi-user wireless communication system based on a time-space coded supersurface. The transmitting end mainly includes a time-space coded metasurface, a feed antenna, and a digital control module; the receiving end is a traditional demodulation device. The invention also discloses the wireless communication method of this system. The feed antenna transmits a single-tone signal to the metasurface, and uses an algorithm to optimize the space-time encoding matrix, and jointly controls the energy distribution of the reflected signal in the space domain and the frequency domain, so that different harmonics The spatial beam of the system points to users in a specific direction for direct encoding of information; through the digital control module, different space-time encoding matrices are switched in real time, and different information is transmitted to multiple designated users simultaneously and independently, while users in other directions cannot demodulate. The transmitter has the characteristics of directional modulation, which can realize confidential communication and anti-interference; it also acts as a space mixer and antenna radiation, eliminating the need for digital-to-analog conversion, mixing and amplification RF modules, simplifying the communication transmitter architecture.

The invention relates to a two-standard four-real data security access system based on 5G edge computing, and the system comprises the following parts: a key generator which is used for verifying the identity of a user, and obtaining a key transmitted by a Beidou controller after the verification succeeds; a key verifier which is associated with the key generator and is used for acquiring a key obtained by a user through the key generator; a 5G edge computing system which comprises a key verification device that interacts with a 5G base station through a 5G air interface and further interacts with the key verifier through a 5G slicing technology, and which is used for obtaining the key and verifying the key through the key verification device to obtain a verification result; the two-standard four-real system platform which is deployed in a public security internal network and is used for storing two-standard four-real data and allowing the key verifier to get access when the verification result obtained by the 5G edge computing system passes. According to the invention, the key generator and the key verifier can be used outside the public security private network to provide preconditions for an extranet user to access the public security intranet two-standard four-real platform data.

The invention discloses a two-channel directional modulation system based on a four-dimensional antenna array. The basic structure comprises an antenna array, a radio frequency modulation switch, a power division network, a local oscillation source, a switch management system, a time sequence memory, a baseband signal source 1, a baseband signal source 2 and the like. The biggest innovation of thetwo-channel directional modulation system lies in that under the condition of no phase shifter, directional modulation and secure communication of two paths of signals in space can be realized only by using a radio frequency modulation switch, and the transmitting direction of the signals can be adjusted by changing a switch sequence. Modulation modes of BPSK, QPSK, QAM and the like can be used,and a good secret communication effect is achieved. Compared with an existing security system based on a four-dimensional antenna array, the method has the advantages of being simple in structure, lower in cost, flexible and convenient to adjust and the like. The present invention is used in a wireless communication system.

The invention discloses a radar communication integrated signal generating and receiving method based on random step frequency OFDM (Orthogonal Frequency Division Multiplexing). The radar communication integrated signal generating and receiving method comprises the following steps: generating a radar communication integrated signal; modulating the step frequency number of each pulse in each symbol of a first pulse; modulating user information to be communicated in a corresponding symbol of the second pulse; modulating the communication information in the third to last pulses; performing up-conversion on the baseband signal of each pulse according to the stepping frequency number, and sending the signal; receiving a radar communication integrated signal; performing down-conversion and demodulation on the first pulse to obtain the step frequency number of each pulse; performing down-conversion on the second pulse according to the stepping frequency number, and demodulating to obtain user information; and performing down-conversion on the third to last pulses according to the stepping frequency number, and performing demodulation to obtain communication information. According to the invention, one-point-to-multipoint communication in a radar communication integrated system can be realized, and confidential communication in a special system is realized by using the random step frequency of each pulse.