| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize access control allowing easy alteration and expansion. <P>SOLUTION: A system for controlling access to data is provided with a first storage part 200 storing a plurality of attribute values, which are selected from a plurality of relatively prime integers for identifying a plurality of attributes of users, in association with the respective users, a second storage part 210 storing the product of two or more attribute values common between users belonging to a set of users for showing the set of users as targets of access control to the data, a calculation part 220 reading a plurality of attribute values corresponding to a user requiring access from the first storage part 200 and calculating the product of two or more attribute values among a plurality of read attribute values, and a control part 230 determining the user as a target of access control to the data on condition that the calculated product of attribute values meets the product of the attribute values stored in the second storage part 210 in association with the access target data. <P>COPYRIGHT: (C)2008,JPO&INPIT |
