Information source encrypted multimedia data export security protection method, device and equipment

The invention provides an information source encrypted multimedia data export safety protection method, device and equipment, and the method comprises the steps: carrying out the decryption of a multimedia data encryption key ciphertext through employing a multimedia data encryption key in a hardware safety medium under the condition of determining that an obtained multimedia data code stream is encrypted and signed, and obtaining a decrypted multimedia data encryption key ciphertext; decrypting the obtained multimedia data code stream by using the obtained first multimedia data encryption key, and performing signature verification on the decrypted multimedia data; under the condition that the decrypted multimedia data signature verification is passed, the multimedia data content carried in the packaging unit is used as an operation object, in a hardware security medium, a preset signature key is used for carrying out signature operation, and a second multimedia data encryption key is used ...

加气机（船用LNG）

Commodity profit acquisition method and device, medium and computing equipment

The embodiment of the invention provides a commodity profit acquisition method and device, a medium and computing equipment. The method comprises the following steps: in response to configuration of a current preferential rule of a target commodity, obtaining the current preferential rule; and in response to the non-effective stage of the current preferential rule, acquiring other preferential information of the target commodity. And determining the beforehand profit prediction value of the target commodity according to the current preferential rule and the other preferential information. And in response to the effective stage of the current preferential rule, monitoring a change message of the other preferential information. And determining a real-time profit prediction value of the target commodity according to the current preferential rule and the change message. And in response to the transaction of the target commodity, determining an actual profit value of the target commodity. The ...

Decentralized video key management method, device and system

The invention provides a decentralized video key management method, device and system. The method comprises the following steps: sending a secondary master key acquisition request to a monitoring platform; receiving and storing a secondary master key ciphertext and a secondary master key index sent by the monitoring platform; when a protection key acquisition request sent by a video acquisition device is received, generating a protection key index, and generating a protection key according to the protection key index, a second equipment identifier and the secondary master key; and encrypting the protection key to obtain a protection key ciphertext, and sending the protection key ciphertext and the protection key index to the video acquisition equipment. According to the method, decentralized video key management can be realized, the network load is reduced, and the fault-tolerant rate and maintainability of the system are enhanced.

A NOVEL VEHICLE-MOUNTED SOS VOICE HELP CALLING SYSTEM

Disclosed is a novel vehicle-mounted SOS voice help calling system, relating to the interdisciplinary field of voice recognition and satellite navigation communications. The novel vehicle-mounted SOS voice help calling system comprises a power supply unit, a voice recognition unit, a control unit, a Beidou navigation unit, and a voice broadcast unit. The voice recognition unit is connected to the control unit; the Beidou navigation unit is connected to the control unit; the voice broadcast unit is connected to the control unit; the power supply unit supplies power for the voice recognition unit, the control unit, the Beidou navigation unit, and the voice broadcast unit. The present invention solves the problems of the limitation of the range of use and the convenience of conventional SOS help calling systems, thereby greatly facilitating the use by a customer.

Isolated bidirectional flyback power supply and control method thereof

The invention discloses an isolated bidirectional flyback power supply, which comprises a transformer, a first power tube, a second power tube, a first control unit, a second control unit, a first optical coupler and a second optical coupler, when the first control unit receives a working control signal and a direction control signal sent by the outside, the first optocoupler is enabled, so that the first control unit drives the first power tube, and the second control unit drives the second power tube, so that the flyback power supply works in the forward direction or the reverse direction; and when the direction control signal received by the first control unit is changed, the conduction state of the second optocoupler is switched so as to switch the current working direction of the flyback power supply. According to the flyback power supply, the primary side and the secondary side of the flyback power supply only pass through one transformer, two optocouplers, the first control unit, ...

CLEANING ROBOT AND MOPPING AND WIPING MEMBER SUPPORT

A cleaning robot and a mopping and wiping member support (7). The cleaning robot comprises: a robot body (1), of which the bottom being provided with a liquid discharge port (11); the support (7) arranged at the bottom of the robot body (1) and capable of moving relative to the robot body (1); and a mopping and wiping member (2) disposed on the support (7) and used for cleaning an object to be cleaned. A plurality of liquid leakage recesses (71) are provided at the position, corresponding to the liquid discharge port (11), of the support (7) in the moving direction of the support (7). Liquid discharged from the liquid discharge port (11) is distributed on the mopping and wiping member (2) through the plurality of liquid leakage recesses (71). The support (7) is provided with the plurality of liquid leakage recesses (71), so that the wetting uniformity of the mopping and wiping member (2) is improved.

Virtual coupon sharing method and device, terminal and medium

The embodiment of the invention provides a virtual coupon sharing method and device, a terminal and a medium. According to the invention, the first terminal displays the at least one purchased virtual coupon, so that the user can select the virtual card to be shared from the virtual coupon, the sharing card at least comprising the card number and the sharing code of the virtual coupon is generated in response to the sharing operation of the user on any virtual coupon, and the sharing card is sent to the second terminal. A user can receive the sharing card sent by the first terminal through the second terminal and display the card number and the sharing code of the virtual card coupon in the sharing card, so that a receiving interface of the virtual card coupon is displayed based on the card number and the sharing code of the virtual card coupon, and the user can receive the virtual card coupon through the receiving interface. The password of the shared card does not need to be exposed in ...

Hydrogenation control system

The invention provides a hydrogenation control system which comprises a hydrogenation pipeline, a refrigerant pipeline, a heat exchanger and a cooling unit, the heat exchanger is arranged on the refrigerant pipeline and used for cooling hydrogen in the hydrogenation pipeline, the refrigerant inlet end of the refrigerant pipeline is connected with the refrigerant outlet end of the cooling unit, and the refrigerant outlet end of the refrigerant pipeline is connected with the refrigerant return end of the cooling unit. The cooling unit comprises N variable-frequency refrigeration compressors; a flow meter is arranged on the hydrogenation pipeline, and/or a temperature sensor is arranged at a refrigerant outlet end of the refrigerant pipeline, signal output ends of the flow meter and the temperature sensor are respectively connected to a signal input end of the control module, and a control end of the variable-frequency refrigeration compressor is connected with a control signal output end ...

一种安全视频物联网密钥管理方法、装置和系统

... 本申请提供了一种安全视频物联网密钥管理方法、装置和系统。本实施例中，通过安全视频管理平台与密钥管理系统相结合，实现密钥管理系统在请求端每次需要VKEK时动态计算请求端所需的VKEK这一非持久化方式来代替现有持久化托管请求端的密钥，提供了非持久化的密钥管理，降低视频密钥存储所带来的空间消耗和时间消耗。 ...

Secure video Internet of Things key management method, device and system

The invention provides a secure video Internet of Things key management method, device and system. In the embodiment of the invention, through the combination of a secure video management platform and a key management system, a non-persistent mode that the key management system dynamically calculates the VKEK required by a request end when the request end needs the VKEK every time is realized to replace the key of the existing persistent trusteeship request end, so that non-persistent key management is provided, and the space consumption and the time consumption caused by video key storage are reduced.

去中心化的视频密钥管理方法、装置与系统

... 本申请提供一种去中心化的视频密钥管理方法、装置与系统，该方法包括：向监控平台发送二级主密钥获取请求；接收并保存所述监控平台发送的所述二级主密钥密文以及所述二级主密钥索引；当接收到视频采集设备发送的保护密钥获取请求时，生成保护密钥索引，并依据所述保护密钥索引、第二设备标识以及所述二级主密钥，生成保护密钥；对所述保护密钥进行加密，得到保护密钥密文，并将所述保护密钥密文以及所述保护密钥索引发送给所述视频采集设备。该方法可以实现去中心化视频密钥管理，降低网络负载，增强系统容错率和可维护性。 ...

Interface document generation method and device, medium and computer equipment

The embodiment of the invention provides an interface document generation method and device, a medium and computer equipment, and aims to parse a target interface method and a target interface path from a target interface class and parse interface parameters from the target interface method so as to generate a class object comprising the interface parameters, and then setting the interface parameters in the class object to a target interface path, and writing the interface parameters in the target interface path into a Swagger document to obtain an interface document. Therefore, various interface parameters required for generating the interface document can be automatically obtained by directly analyzing the target interface class and the target interface method, a developer does not need to fill in a corresponding interface document, the operation complexity during interface document generation is reduced, and better experience is brought to a user.

Hydrogen filling system

The hydrogen filling system comprises N hydrogen storage pipelines, inlets of the hydrogen storage pipelines are connected with an outlet of a hydrogen compressor, and outlets of the N hydrogen storage pipelines are connected with hydrogen storage facilities in a one-to-one correspondence mode; hydrogen from the hydrogen source is pressurized by the hydrogen compressor and then enters the hydrogen storage facilities through the hydrogen storage pipeline, and the hydrogen storage facilities are sequentially filled from high to low according to air pressure values in the corresponding hydrogen storage facilities; the N hydrogen storage facilities are connected with the hydrogenation devices in a one-to-one correspondence manner through respective corresponding hydrogenation pipelines; the N hydrogen storage facilities are connected to an inlet of the hydrogen compressor through corresponding hydrogen recovery pipelines, and N is a positive integer larger than 1. According to the hydrogen ...