Yoshiki Sameshima

TL;DR: A new authorization scheme is introduced, an implementation of an information server which adopts the new scheme is presented, and a solution which refers to security information of other security domains through a directory service is proposed.

TL;DR: In this article, the authors propose to filter I/O access to a device from a file system on the basis of the data mapping information of the virtual volume, whereby read/write access to unnecessary portions is avoided.

TL;DR: A security policy configuration system SEEdit is proposed which facilitates creating security policy by a higher level language called SPDL and SPDL tools which generate security policy configurations from access logs and tool user's knowledge about applications.

TL;DR: Seedit as mentioned in this paper is a security policy configuration system that facilitates creating security policy by a higher level language called SPDL and SPDL tools, which reduces the number of permissions by integrated permissions and removes label configurations.

TL;DR: In this article, a key escrow system of the RSA cryptosystem that protects user privacy with the following properties; (1) neither investigation agency nor key escrower agent accesses private key of user directly, (2) investigation agency can decrypt user data of restricted time period and communication entities, and (3) split private keys of user are deposited correctly in multiple key escrows without any information leakage of the private key with help of a zero-knowledge interactive protocol.