Tadashi Kaji

TL;DR: In this article, the authors propose a control device consisting of a requirement list storage unit which stores a security requirement for communication data corresponding to an application operating in the control device and a command used by the application; an evaluation result storage unit, which stores the evaluation result associated with execution of a variety of encryption algorithms; and an own device environment information storage unit that stores environment information indicating the state of the control devices; and a cryptography selection unit which selects, from the various encryption algorithms, an encryption algorithm which encrypts the communication data and satisfies the security requirement, evaluation result,

TL;DR: In this paper, the authors propose a data communication method for forwarding a session control message designating a destination server with an IP address to the destination server via a session management server, wherein, when an application program or encrypted communication software on a client issues a connection request, the client or the session manager server automatically converts the IP address into a desired resource identifier identifiable a domain, thereby to determine the domain to which the received connection request message should be forwarded.

TL;DR: In this paper, a session control message designating a destination server with identification information unique to application is transferred to the destination via a session management server, where the identification information is converted into a desired resource identifier identifiable a domain to determine a domain as the destination of the received connection request message.

TL;DR: In this paper, an authentication server is dynamically changed in consideration of a user's situation, a kind of service used by the user and user's convenience, and an authentication intermediary server is selected among authentication servers that satisfy selection conditions previously set by the users of the terminal device.

TL;DR: A validation authority for certificates searches for and verifies paths and certificate revocation lists periodically, and classifies the paths into valid paths and invalid paths in accordance with the results of the validations, so as to register the paths in databases beforehand as mentioned in this paper.