摘要:
In a network composed of a plurality of nodes wherein the nodes verify mutually and can communicate directly each other, when a certificate is revoked due to withdrawal of a node, the revoking node transmits a withdrawal notice to all the other existing nodes which can be connected directly and promotes them to update the connection tables and revocation lists held by the respective nodes.
摘要:
Provided are an authentication method, authentication system and a terminal device in which the authentication of a non-participating third node is can be simplified and can be executed in the case of multicast by using an authentication ticket in a distributed processing network system, the non-participating third node being intended to access each of the nodes, including a first and a second node, constituting a workgroup. The first node that has already participated in the workgroup authenticates the third node intended to participate in the workgroup and issues the authentication ticket including the signatures of both nodes, and when the authentication ticket is submitted to the second node, the second node permits the third node to access, without password-based-authentication, by authenticating the first node and the second node which have signed the authentication ticket.
摘要:
A data input/output system, a data input/output system control method and a data input/output system control apparatus can be provided. In the data input/output system having input and output devices, it is determined and displayed whether an output device can output an input data received from an input device, thereby allowing the output device for outputting the input data to be easily selected with reliability by use of a minimum number of operations and thereby eliminating erroneous operations.
摘要:
To provide an apparatus and a method for encrypted communication processing in inter-node communication on a network capable of performing effective encrypted communication with improved security. In the inter-node multicast communication on the network, by first setting one or more of encryption keys, it can be avoided to deteriorate, by the procedure for an encrypted communication, the condition where the multicast communication is possible. Therefore, the multicast by the effective encrypted communication with improved security becomes possible.
摘要:
In an image-processing employing a dither matrix a basic dither pattern is formed of a set of a plurality of basic patterns each including a plurality of pixels. In a single basic pattern a single pixel is assigned 1 serving as a number indicating an order followed to illuminate a dot in the dither matrix. When basic dither patterns are arranged longitudinally and laterally a location remotest from any pixel assigned a number is selected and a pixel at that location is assigned a subsequent number. This series of operations is repeated. When there is no basic pattern that is not assigned a number, in basic pattern a number indicating an order followed to illuminate a dot is assigned to allow the dither matrix to a dither matrix of dot convergence type. Thus a dither matrix allowing an image processing apparatus to satisfactorily reproduce an image can be created.
摘要:
From profiles of an input color space and an output color space, the specific color data on respective color spaces are obtained, and a color space compression parameter is set based on each specific color data obtained. In other words, the color space compression parameter for appropriately converting data within the input color space into data within the output color space is derived from each specific color data. The color space compression processing (color matching) is performed on an absolute color space using the derived color space compression parameter so that it becomes possible to perform at a higher speed an appropriate color matching that takes into account the characteristics of the input color space and the output color space.
摘要:
A multi-tone image processing method and apparatus in which mutually dissimilar tone levels are realized by changing the additive condition of recording energy by means of different recording positions, even when the number of recording operations within a specific range is identical. For example, in an electrophotographic apparatus, when the number of irradiation by a light spot within a specific range remains constant as the irradiation position is changed in the specific range, there is a change in the additive condition of the optical energy within said specific range. Thus, the area rendered visible within the aforesaid specific range also changes, thereby changing the tone level.
摘要:
In a data input/output system having a plurality of input devices and a plurality of output devices, a display can be performed with a consistency maintained between an input parameter used to establish the operational condition of an input device to be used for data input and an output parameter used to establish the operational condition of an output device to be used for data output, and thereby the data input/output system, a data input/output method and a data input/output system control apparatus can be provided, wherein an optimum establishment of setting items which are related to a combination between input and output devices required in a case where a multiple of input and output devices are connected to one another can be easily done with reliability by use of a minimum number of operations and thereby eliminating erroneous operations.
摘要:
In a network made up of a plurality of terminals, each of the terminals in the network includes a digital certificate revocation list. When the digital certificate revocation list of its own is updated, the terminal sends information including the updated details to other terminal so that a digital certificate revocation list included in the other terminal in the network is updated based on the updated contents.
摘要:
An image processing apparatus providing a halftoning process such as error diffusion prevents an image contour distortion, as follows: data in an image to be processed is used to partially extend the image to be processed. Then error diffusion or the like is employed to provide a halftoning process. The extension is removed to obtain image data. A dot generation delay can be prevented that would otherwise be introduced such as when an extension-free image is halftoned.