Patent application number | Description | Published |
20080256401 | Information Processing Apparatus, Information Processing System, Information Processing Method and Computer Program - The present invention is directed to an information processing system composed of plural information processing units adapted for mutually executing data communication, and for executing data processing in which communication data has been applied. The first entity A transmits error notification data on the basis of error detection to execute initial state return processing on the condition that data reception after error notification data has been transmitted is made, and the second entity B transmits error notification data on the basis of error detection to execute initial state return processing on the condition that transmit processing of error notification data is executed. Thus, the both entities A and B can return to the initial state in a manner synchronous with each other. As a result, it becomes possible to perform reliable error recovery and data processing restart. | 10-16-2008 |
20090177888 | INFORMATION PROCESSING DEVICE, KEY SETTING METHOD, AND PROGRAM - There is provided an information processing device including an identifier setting unit for setting an identifier to a set of terminal devices corresponding to each node of a tree structure, and a key setting unit for setting a key distributed to the terminal device based on the identifier, wherein the identifier setting unit includes a first identifier indicating the set of terminal devices corresponding to each node, and sets the identifier so as to further include a second identifier showing a correspondence relation between plurality of subsets when the set includes a plurality of subsets. | 07-09-2009 |
20090208005 | KEY GENERATING DEVICE, ENCRYPTING DEVICE, RECEIVING DEVICE, KEY GENERATING METHOD, ENCRYPTING METHOD, KEY PROCESSING METHOD, AND PROGRAM - A key generating device according to an embodiment of the present invention includes: a parameter determining unit that randomly determines a plurality of parameters that are needed when generating a secret key and a public key; a bilinear group selecting unit that selects a plurality of bilinear groups and bilinear mapping on the basis of the plurality of parameters; and a key generating unit that generates the secret key and the public key on the basis of the parameters and the plurality of bilinear groups. | 08-20-2009 |
20100040235 | Key Providing System, Terminal Device, and Information Processing Method - A terminal device improved with a digraph generation method in a key distribution method of various types of broadcast encryption systems is provided. The terminal device includes an acquiring unit for acquiring information related to a set, which is selected from a plurality of sets representing a combination of a plurality of terminal devices, and which represents some or all of the plurality of terminal devices; an extracting unit for extracting the set contained in the information and to which it belongs; and a digraph generation unit for generating a directional branch for generating a key corresponding to the extracted set in a predetermined digraph formed by a plurality of directional branches. | 02-18-2010 |
20100054465 | INFORMATION PROCESSING UNIT, TERMINAL UNIT, INFORMATION PROCESSING METHOD, KEY GENERATION METHOD AND PROGRAM - It relates to an information processing unit, a terminal unit, an information processing method, a key generation method and a program that enable reduction of the number of keys to be held by users and aims at providing an information processing unit capable of generating a directed-graph representing an encryption key generation logic to derive a set-key for encrypting a content or a content-key. The technique relates to a scheme that divides a set of user terminals into some subsets, allocates a set-key and an intermediate-key to each subset, and upon input of an intermediate-key correlated with a subset, outputs the set-key corresponding to the subset and the intermediate-key of the subset associated by the directed-edge. Further, it relates to a technique of replacing the directed-edge in the directed-graph with a shorter directed-edge. The effect of reducing the number of intermediate-keys held by each user is expected from the technique. | 03-04-2010 |
20100067702 | KEY GENERATION DEVICE, ENCRYPTION DEVICE, RECEPTION DEVICE, KEY GENERATION METHOD, KEY PROCESSING METHOD, AND PROGRAM - A key generation device according to the present invention hierarchically constructs a Y-ary tree structure where n reception devices are assigned to leaves, and forms subgroups where individual intermediate nodes existing between the leaves and a root of the Y-ary tree structure are defined as parent nodes. By providing new parameters to the individual intermediate parameters, the subgroups can be formed flexibly. In a case where no excluded customer exists or the number of excluded customers is small, the size of a header to be delivered and the calculation amount of an operation that a customer needs to perform can be reduced. | 03-18-2010 |
20100077201 | INFORMATION PROCESSING UNIT, TERMINAL UNIT, INFORMATION PROCESSING METHOD, KEY GENERATION METHOD AND PROGRAM - There is provided an information processing unit enabling reduction of the number of keys to be held by a terminal unit and the amount of calculations necessary for decryption of encrypted data. The information processing unit configures an entire binary tree made up of n-number of leaf nodes, a root node and a plurality of intermediate nodes different from the root node and the leaf nodes and divides the entire tree into a plurality of base subtrees including n | 03-25-2010 |
20100086133 | Key Providing System, Key Providing Apparatus, Terminal Device, Key Providing Method, and Key Generation Method - A key providing apparatus for providing a key used for encryption or decryption of data to a predetermined terminal device is provided. The key providing apparatus includes an acquiring unit for acquiring a digraph formed by arranging at least one directional branch connecting the coordinate points on a coordinate axis having a plurality of coordinate points each corresponded with a subset representing a combination of a plurality of terminal devices, an extracting unit for extracting information of all the directional branches contained in the directional path connecting a starting point of the digraph and a predetermined coordinate point, and a key generation unit for generating a key corresponded to a subset to which a predetermined terminal deice belongs based on the digraph, where the information of the directional branch is provided to the predetermined terminal device. | 04-08-2010 |
20100119058 | INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING METHOD, AND PROGRAM - There is provided an information processing apparatus according to the invention including a bilinear map selection unit for selecting a bilinear map used for a predetermined operation, a group selection unit for selecting at least two types of groups G | 05-13-2010 |
20100250936 | INTEGRATED CIRCUIT, ENCRYPTION COMMUNICATION APPARATUS, ENCRYPTION COMMUNICATION SYSTEM, INFORMATION PROCESSING METHOD AND ENCRYPTION COMMUNICATION METHOD - There is provided an integrated circuit includes an arithmetic circuit having input/output characteristics determined by element-specific physical characteristics; a storage unit having cipher text obtained by performing encryption processing on predetermined secret information using an output value output from the arithmetic circuit with respect to input of a predetermined value and the predetermined value input into the arithmetic circuit stored therein; and a decryption unit that restores the predetermined secret information by inputting the predetermined value stored in the storage unit into the arithmetic circuit and decrypting the cipher text stored in the storage unit using the output value output from the arithmetic circuit when the predetermined secret information is used. | 09-30-2010 |
20100262830 | AUTHENTICATION DEVICE, AUTHENTICATION METHOD, AND PROGRAM BACKGROUND OF THE INVENTION - Provided is an authentication device which includes a register in which a first-bit or a second-bit different from the first-bit is stored, m first determination units for determining whether input information and authentication information match, and for storing the first-bit in the register if a result of the determination is TRUE and for storing the second-bit in the register if FALSE, (N−m) second determination units for determining whether input information and authentication information do not match, and for storing the first-bit in the register if a result of the determination is TRUE and for storing the second-bit in the register if FALSE, and an authentication determination unit for determining that an authentication is established, in case the first-bit is stored in the register by a determination process by every first determination unit and the second-bit is stored in the register by a determination process by every second determination unit. | 10-14-2010 |
20100281316 | SEMICONDUCTOR INTEGRATED CIRCUIT, INFORMATION PROCESSING APPARATUS, OUTPUT DATA DIFFUSION METHOD, AND PROGRAM - A semiconductor integrated circuit includes a scan chain configured to serve as a connection path used for testing the semiconductor integrated circuit and connect a plurality of flip-flops and an interleave circuit provided at an output portion of the scan chain. The interleave circuit includes a plurality of branches including different numbers of stages of storage elements, a selector configured to select one of the plurality of branches serving as an input/output branch that performs input of data from the scan chain and output of data from the interleave circuit, and a selector controller configured to execute a process of switching among the plurality of branches to select the input/output branch at every predetermined timing. | 11-04-2010 |
20110145578 | Actor node, sensor node, coverage block change method, parameter change method, program, and information processing system - An actor node according to the present invention includes a dynamic change unit for temporarily changing a coverage block in which data are obtained from a sensor node and temporarily causing another actor node to obtain, on behalf of the actor node, data from the sensor node arranged in a partial region of at least a portion of the coverage blocks. The dynamic change unit obtains identification information unique to the another actor node from the another actor node. The dynamic change unit notifies, to the sensor node arranged in the partial region, the obtained identification information. The dynamic change unit notifies, to the another actor node, a portion of the hash chain and a temporary key generated using the obtained identification information and the key used for communication with the sensor node arranged in the partial region. | 06-16-2011 |