摘要:
A combination-based broadcast encryption method includes: assigning by a server a base group of different combinations to each user; producing and sending secret information for each user by using as a base the base group allocated to each user; producing and sending an inverse-base parameter value through calculations with integers used to produce the base group and key value information of one or more privileged users; and deriving a group key by using the key value information of the privileged users, encrypting a session key by using the derived group key, and sending the encrypted session key to each user. Accordingly, each user is assigned a different base through a combination, thereby having security against collusion attacks.
摘要:
An apparatus and method for generating a key for a broadcast encryption. The apparatus includes a node secret generator for managing a user that receives broadcast data in a tree structure and for generating a unique node secret for each node in the tree structure. The apparatus also includes an instant key generator for temporarily generating an instant key used at all nodes in common in the tree structure, and a node key generator for generating a node key for each node by operating the node secret generated at the node secret generator and the instant key generated at the instant key generator. Thus, key update can be efficiently achieved.
摘要:
A method of allowing a packet in a network image forming apparatus includes setting user account information corresponding to the plurality of network interfaces, determining allowability of a received packet by using information included in the received packet and the set user account information, and when the received packet is allowable, performing an operation corresponding to the received packet. Accordingly, in an image forming apparatus installing a plurality of network interfaces, not only allowability of each interface to each user but also a type of protocol provided to each user can be setup. Consequently, an environment that can use an interface in various forms according to each user can be provided.
摘要:
An inkjet printhead and a method of manufacturing the printhead. The inkjet printhead includes a substrate through which an ink supply passage is formed, a chamber plate stacked on the substrate having an ink chamber filled with ink supplied through the ink supply passage and heating resistors to heat the ink formed in the ink chamber, a nozzle plate formed on the chamber plate and through which a plurality of nozzles through which ink is ejected are formed, and a water repellent layer formed on the nozzle plate, wherein portions of a covalent bond formed by reaction between the material forming the nozzle plate and a hydrolysis material used to form the water repellent layer are discontinuously formed.
摘要:
A terminal device and a data transceiving method are provided. The terminal device includes a sensing unit which senses a momentum of the terminal device, an interface unit which receives a momentum from at least one external device, and a control unit which performs one of a data receiving operation, a data transmitting operation, and a data transceiving operation with the at least one external device depending on a comparison value obtained from a comparison of the sensed momentum with the received momentum to allow two devices to exchange data more easily.
摘要:
An inkjet printhead and a method of manufacturing the same. The inkjet printhead includes a substrate, a chamber layer to define an ink chamber on an upper portion of the substrate, and an adhesive portion to adhere to the substrate and the chamber, wherein the adhesive portion is formed of a phenolic sensitive resin.
摘要:
A method of performing an image forming operation in an image forming apparatus supporting peer to peer (P2P) connection includes P2P connecting the image forming apparatus to an external wireless device while the image forming apparatus is wirelessly connected to an access point (AP) of an infrastructured network, receiving a discovery packet from the wireless device via a P2P interface, transmitting to the wireless device a response packet including an Internet protocol (IP) address of the P2P interface, receiving from the wireless device an image forming operation performing request having the IP address of the P2P interface as a destination, and performing the requested image forming operation.
摘要:
Provided is a multi-function printer (MFP) supporting Wi-Fi Direct. The MFP includes a print engine to perform a printing operation, a first wireless interface to connect the MFP to an access point (AP) of an infrastructured network, a second wireless interface to connect the MFP to an external wireless terminal in a Wi-Fi Direct, a soft AP to allow the MFP to perform as an AP when the MFP is Wi-Fi Direct connected, and a dynamic host configuration protocol (DHCP) server unit allocating an internet protocol (IP) address to the wireless device that is Wi-Fi Direct connected to the MFP, where the MFP is simultaneously connected to an AP of the infrastructured network and an external wireless terminal via the first wireless interface and the second wireless interface by using one channel.
摘要:
A multi-function printer (MFP) supporting Wi-Fi Direct includes a print engine to perform a print operation, a first wireless interface to connect the MFP to an access point (AP) of an infrastructured network, a second wireless interface to Wi-Fi Direct connect the MFP to an external wireless terminal, a soft AP to allow the MFP to perform as an AP when the MFP is Wi-Fi Direct connected, a dynamic host configuration protocol (DHCP) server unit to allocate an internet protocol (IP) address to the wireless device that is Wi-Fi Direct connected to the MFP, a Wi-Fi Direct connection manager to manage the Wi-Fi Direct connection, and an automatic group owner (AGO) manager activate Wi-Fi direct so as to drive the soft AP and operate the MFP as a group owner (GO) when the MFP receives a Wi-Fi Direct activation request.
摘要:
An image forming apparatus is provided. The apparatus includes an image forming unit which performs an image forming job, a communication unit which forms a wireless network according to a predetermined wireless communication standard, a control unit which, if at least one terminal device is connected to the communication unit through the wireless network, determines whether it is required to perform warming-up of the image forming apparatus and performs warming-up of the image forming apparatus, and a storage unit which stores information regarding a connection status of the terminal device. Accordingly, stand-by time for performing an image forming job may be reduced.