Abstract:
A method for realizing multi-party communication security includes: performing identification authentication and negotiating to create an initiation session through running the transport layer security protocol or datagram transport layer security protocol by a Group Control and Keying Server and a group member device; distributing a group session and a rekeying session to the group member device through running a group key management sub-protocol on the Group Control and Keying Server and the group member devices; rekeying through running the group key management sub-protocol on the Group Control and Keying Server and the group member devices, when a rekeying event is detected by the Group Control and Keying Server. A relevant multi-party communication security system and a device are further provided in the present invention.
Abstract:
The present disclosure provides a method and system of key sharing, the method includes: transmitting, by a group member, a key information request to a neighbor group member; transmitting, by the neighbor group member, the requested key information to the group member, upon receiving the key information request. The system includes: a requester group member and a responder group member. With the method and system of the disclosure, it may improve the reliability and availability of group key and/or auxiliary key distribution, which avoids the bottleneck in service performance and network bandwidth that may occur when all the group members obtain the key from the key server.
Abstract:
A converter includes a transformer having a primary winding, a secondary winding and an auxiliary winding, a first switching device for connecting an input voltage to the primary winding of the transformer, an output circuit connected to the secondary winding, a controller, and an integrated active clamp and primary bias circuit. The integrated active clamp and primary bias circuit includes the auxiliary winding and a second switch providing a bias voltage to the controller to alternately operate the first and second switches between conductive and non-conductive states. When the first switch is conductive the second switch is nonconducting and power is transferred from the primary winding to the output circuit via the secondary winding and from the auxiliary winding to the controller. When the first switch is nonconducting, the second switch is conducting and the voltage across the primary winding is clamped.
Abstract:
This invention discloses a stacked flash memory chip package and a method for the stacked flash memory chip package. A first flash memory chip is mounted on a substrate, in which the first flash memory chip has an inactive surface for adhering to the substrate and a number of bond pads are all disposed on one side of an active surface of the flash memory chip. Then, a second flash memory chip is mounted over the first flash memory chip in a non-alignment manner so that the second flash memory chip shields part of the active surface of the first flash memory chip and that the bond pads of first flash memory chip are exposed. Then, the bond pads of the first flash memory chip and the bond pads of the second flash memory chip are respectively connected to the circuit of the substrate by wire bonding.
Abstract:
A leakproof structure of the lamp holder, combined with an installation hole, which can ensure that the coolant in the accommodation space does not leak out; moreover, the lower part of the halogen bulb is covered by the waterproof plug in a tight state, so as to achieve a complete leakproof structure. Therefore, according to the temperature of the coolant, the automatic control system calculate the optimal flow rate of the coolant in a proportional mode that the higher the temperature, the faster the flow rate, so as to achieve the most effective mode of heat dissipation, then perform contact heat dissipation to the halogen bulb to solve the problem of the non-contact heat dissipation of halogen bulb of the prior art that cannot achieve the predetermined heat dissipation effect and resulting in the easy damage of halogen bulb; and further improves the product reliability and the service life.
Abstract:
A multi-phase down hole injector related to a down hole tool for oilfield well drilling, has a shooting pipe, an axial hole disposed in the center of the shooting pipe, one end of the shooting pipe is connected to an ellipsoid guide, at least two housing seats sets are disposed along the shooting pipe, every housing seat set are disposed with at least two housing seats of radial symmetry, the inner ends of every housing seat is separately connected to the axial hole, every housing seat is disposed with a injection barrel by the base, and the explosive cavity is disposed between the base and the housing seat. The injected viscosity fluid can exert squeezing and shearing force to the rock to make the channel and breach smaller or eliminated.
Abstract:
A system and method for implementing security of multi-party communication is disclosed in the disclosure. The system mainly includes a group key management unit and a record protocol unit. The method mainly includes when the system runs in the centralized group key management mode, the Group Controller and Key Server (GCKS) establishes and stores a Group Security Association, the GCKS negotiates with the group members to establish an Initiation Security Association, under the protection of the Initiation Security Association, the group members obtain the Group Security Association from GCKS. When the system runs in the distributed group key management mode, a Group Security Association is established by all the group members together at the beginning of the group communication. The system runs in the application process space and can provide an application program (or application protocol) with the function of the group key management and data security of the multi-party communication in the form of the standard Application Programming Interface (API).
Abstract:
A resonant switched power converter having switching frequency controlled in response to an output voltage thereof achieves over-current protection such as at start-up or under short circuit conditions using a resonant tank circuit which provides a notch filter in addition to a band pass filter. A additional band pass filter provided in the resonant tank circuit achieves increased power transfer to a load and reduced circulating resonant currents and conduction losses. The inductances of the preferred LCLCL tank circuit or other tank circuit with two pass band filters and a notch filter may be integrated into a single electrical component.
Abstract:
Improved regulation and transient response are provided by a power supply architecture providing both unregulated and regulated voltage converters in parallel but deriving input power from separate power supplies connected in series wherein regulated and unregulated branches each provide a substantially fixed and constant proportion of the output current. The series connection of input power sources may provide a further feedback mechanism in addition to feedback for regulation which enhances overall performance. As a perfecting feature of the invention, inductor-less resonant converters which are switched in an interleaved fashion may be used in the unregulated branch while substantially cancelling the characteristic large output voltage ripple thereof.
Abstract:
A USB plug with a built-in card-reading slot having a metal housing meeting the specification of a USB A-Type plug and an isolation substrate enclosed within the metal housing. A first slot in electric connection to a USB female plug is created at a first surface thereof. The thickness of partial portion of the isolation substrate is less than 1.2 mm such that a second slot for the insertion of a thin-type Micro SD/T-Flash memory card is formed between the second surface and the second wall. A plurality of metal terminals is positioned on the second surface for an electric connection to the memory card such that the second slot 46 is formed as a thin-type card-reading slot for the SD/T-Flash memory card. Moreover, an indentation is formed at the tail of the second wall for the insertion of the protrusion of the memory card such that the protrusion just fits into the indentation when the memory card is inserted into the second slot; moreover, the contour still meet the specification of the normal USB plug such that a normal USB operation won't be affected when the USB plug is attached to a terminal portion of an electronic product.