4results about How to "Improve data transmission security" patented technology

The application relates to the technical field of Internet of Things communication, and discloses a blockchain-based Internet of Things cross-network data security interaction method and system, which is characterized in that: based on the communication data of an Internet of Things sending end, the feature information of a shared Internet of Things communication sending end is used to establish a distributed communication data sharing ledger of the Internet of Things sending end, so that a high-reliability communication data tamper-proof system of the Internet of Things sending end is scientifically established based on blockchain technology; through an Internet of Things gateway, the communication data of an Internet of Things receiving end is dynamically acquired, and the feature information of a shared Internet of Things communication receiving end is combined with data processing to establish a distributed communication data sharing ledger of the Internet of Things receiving end, so that a high-reliability communication data tamper-proof system from the Internet of Things sending end to the receiving end is scientifically established based on blockchain technology, and the data transmission security of Internet of Things cross-network communication is improved.

The embodiment of the invention provides a two-layer data transmission method and device, relates to the technical field of communication networks, and is suitable for various networking scenes such as an enterprise network, a data center network and an FTTR network. The method comprises the following steps: a first PE device in an L2VPN network receives a two-layer data message through an AC; matching the target message feature of the two-layer data message with a preset ACL table item; if the target message feature is successfully matched with the preset ACL table item, encrypting the two-layer data message, and adding a control word to the two-layer data message to obtain an encrypted message, the control word indicating that the message to which the control word belongs is the encrypted message; and sending the encrypted message to the second PE device in the L2VPN network through the PW. And based on the control word carried by the two-layer data message, the second PE device decrypts the two-layer data message to obtain a decrypted message and sends the decrypted message. According to the scheme, the networking cost of the L2VPN such as the FTTR can be reduced while the data transmission security in the networking of the L2VPN such as the FTTR is improved.

The invention provides an automobile electronic control system remote firmware differential encryption upgrading method and system, and the method comprises the steps: generating a dynamic session key of a remote upgrading session through the encryption protocol feature of a current link, a session key negotiation mechanism and a unique equipment identifier of a target electronic control unit; performing differential comparison on a target firmware version to be upgraded and the current firmware version information to obtain a firmware difference data block, and performing feature encryption on the firmware difference data block by using the dynamic session key to generate an encrypted differential upgrade package; and issuing the differential upgrade package to a target electronic control unit through a secure communication link of the vehicle electronic control system, verifying a digital signature in the target electronic control unit, decrypting by using the dynamic session key to obtain a firmware difference data block, and carrying out differential recombination on the firmware difference data block and the current firmware to complete firmware upgrade. Based on the scheme, the dynamic binding of the communication link feature and the hardware identity can be realized.

The utility model discloses a high and low orbit satellite fusion multi-band compact antenna, which comprises an upper shell and a bottom shell which are connected, a plurality of support columns arranged on the top surface of the bottom shell, and a DCS low orbit satellite communication antenna, a high orbit satellite RX antenna, a high orbit satellite TX antenna, a GNSS positioning antenna, a 4G LTE antenna and a mainboard which are arranged in an accommodating cavity of the upper shell, the high-orbit satellite RX antenna, the high-orbit satellite TX antenna and the GNSS positioning antenna adopt a ceramic laminated structure; the ceramic laminated structure comprises an upper-layer ceramic substrate special for a high-orbit satellite RX antenna, a lower-layer ceramic substrate integrating a high-orbit satellite TX antenna and a GNSS positioning antenna, and a common PCB from top to bottom; a feeding point of the high-orbit satellite RX antenna and a feeding point of the GNSS positioning antenna are respectively connected with the corresponding LNA circuits on the common PCB; a feeding point of the high-orbit satellite TX antenna is connected with a PA circuit on the mainboard; and a communication mode of multi-band fusion and intelligent switching is realized.