Yasutsugu Kuroda

Electronic data storage apparatus with key management function and electronic data storage method

Electronic data storage apparatus, system and method

Apparatus and method for proving transaction between users in network environment

File management apparatus and method

Apparatus and method for managing electronic original data

Security level control apparatus and method for a network securing communications between parties without presetting the security level

Apparatus method and computer readable storage medium with recorded program for managing files with alteration preventing/detecting functions

Cryptoinformation repeater, subscriber terminal connected thereto, and cryptocommunication method

User support system for cryptographic communication in network systems

System and method of authentication of digital information