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

The invention relates to a method for key management and node authentication of a sensor network. The method comprises the following steps: 1) key pre-distribution, wherein a deployment server is used for establishing communication keys for the secure connection between nodes and distributing the communication keys to all the nodes before network deployment; 2) key establishment, wherein key pairs for the secure connection are established between nodes after the network deployment; and the step of key establishment further comprises the following steps: 2.1) the establishment of shared keys, wherein key pairs are established between adjacent nodes having the shared keys; and 2.2) the establishment of path keys, wherein key pairs are established between nodes having no shared keys but multi-hop secure connection; and 3) the authentication of node identities, wherein the identity authentication is carried out before the formal communication between nodes, so as to confirm the validity and effectiveness of the identity of the other party. The invention is capable of effectively resisting the attack on network communication, such as eavesdropping, tampering and resetting, achieving the secure communication between nodes, effectively saving the node resources of the sensor network and prolonging the service life of the sensor network.

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 discloses a dual-channel directional modulation system based on a four-dimensional antenna array. Its basic structure includes antenna array, radio frequency modulation switch, power division network, local oscillator source, switch management system, sequential memory, baseband signal source 1, baseband signal source 2 and other devices. The biggest innovation of the present invention is that in the absence of a phase shifter, only using a radio frequency modulation switch, the directional modulation and secure communication of two signals in space at the same time are realized, and the transmission direction of the signal can be adjusted by changing the switch sequence . The present invention can use BPSK, QPSK, QAM and other modulation modes, and has good secret communication effect. Compared with the existing security system based on four-dimensional antenna array, this method has the characteristics of simple structure, lower cost, and flexible and convenient adjustment. The invention is used in a wireless communication system.

The invention relates to a method for secret communication between communication terminal and wireless access point comprising following steps: (1) presetting unique identification information and communication key in encryption device, storing authenticated identification information and key of encryption device at wireless access point; (2)connecting encryption device and communication terminalvia communication interface and acquiring power supply, installing and operating dedicated drive program on communication terminal; (3) the encryption device sending authentication request including identification information to wireless access point; (4) wireless access point authenticating the encryption device according to identification information included in authentication request, if authentication being successful, then fetching corresponding key and sending notice of permission for access; (5) the encryption device notifying communication terminal of the established connection with wireless access point after receiving permission for access, encrypting, deciphering the transmitted data by communication key; wireless access point encrypting and deciphering the transmitted data viakey.

The invention discloses a short message secret communication method and system based on a chaos algorithm. The short message secret communication method comprises the steps that A, a sending terminal firstly performs scrambling encryption on data of a short message, and then performs an exclusive-or operation with a chaos sequence generated by a chaos system; and B, a receiving terminal firstly performs an exclusive-or operation on the data of the short message and the chaos sequence generated by the chaos system, and then executes anti-scrambling decryption. Encryption processing is performed on the short message according to combination of a short message protocol and the chaos system so as to realize secret communication of the short message. Meanwhile, an excellent encryption effect of the short message is ensured by combining inherent randomness, irregular orderliness and sensitivity for an initial value of the chaos system.

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 the fraction 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 the design of a multi-user communication system.

Disclosed are a double-path wireless voice secret communication system and method based on a Lorenz chaotic circuit. The system comprises a first wireless voice secret communication system and a second wireless voice secret communication system; each wireless voice secret communication system comprises a wireless voice sending system and a wireless voice receiving system; each wireless voice sending system comprises a Lorenz chaotic driving system circuit, a step-down interface circuit, a wireless sending module and an encrypted circuit; each wireless voice receiving system comprises a Lorenz chaotic response system circuit, a step-up interface circuit, a controller, a wireless receiving module and a decrypting circuit; communications are carried out between the wireless voice sending system and the wireless voice receiving system of the first wireless voice secret communication system, and communications are carried out between the wireless voice sending system and the wireless voice receiving system of the second wireless voice secret communication system. Having characteristics like noise, chaotic signals are concealed; being extremely sensitive to initial conditions, the chaotic signals have long-term unpredictability and extremely strong intercepting and capturing resisting ability.

This invention discloses a device and a method for end-to-end ciphered communication between wire telephones and cell phones. A MODEM module of the device is connected with the wire phone net, GSM module is connected with GSM net, the exchange module is connected with MODEM and GSM module, a control module is connected with the MODEM, exchange and GSM, a power supply module provides working supply to the modules. The secure communication is realized by the following steps taking the wire phone secure set as the calling party: 1, the calling party dials the gateway access number and a called cell phone number, 2, PSTN exchange provides the dial number to the gate, its MODEM extracts the number to the control module, 3, the control module calls the cell phone by GSM net, 4, the cell phone sends a response to GSM module to set up GSM communication, 5, the control sends the response to the server set to set up PSTN communication connection, 6, the control module controls the exchange module to connect MODEM and GSM modules for secure communication.

The invention provides a Web communication encryption method, which distinguishes between the first communication and the second communication between the client and the server. When the client accessing for the first time communicates with the server on the Web, it needs to negotiate to determine the communication encryption algorithm, and there is no need to negotiate again when communicating again; when communicating for the first time, the client obtains the communication master key provided by the server and saves the communication master key , when communicating again, the server only needs to calculate and generate the key locally, and the client uses the locally stored communication master key to transmit the session key, and then the two parties use the session key to encrypt and decrypt the communication data to realize confidential communication. The communication encryption method of the present invention greatly reduces the key storage capacity of the server, and the reduction of the key exchange calculation load of the server is also obvious.

The invention discloses a bidirectional chaotic secure communication system based on TWDM-PON and a communication method. A beam of continuous laser is injected into an isolator-free multi-longitudinal mode semiconductor laser with external cavity random grating feedback, thereby realizing spectrum broadening of multi-mode chaotic laser without delay feature; the light is divided into multiple paths through a multipath light splitter, three paths form one group, each group is connected with a forward multipath information loading transmission demodulation part and a backward multipath information loading transmission demodulation part; the chaotic laser is separated according to the longitudinal-mode wavelength by using a wave-division multiplexer so as to be used as the chaotic laser carrier of multipath communication; three paths of each group form two closed-loop structures for realizing forward multipath information loading transmission demodulation and backward multipath information loading transmission demodulation. The multiuser directional secure communication can be realized, and the high-speed information can be loaded, the user amount is greatly improved, and the user demand is satisfied.