Secret information analysis system and secret information analysis method

摘要

PROBLEM TO BE SOLVED: To identify an information provider of information with the information kept concealed.SOLUTION: A concealed information analysis system has: an information collection unit; a concealing unit; a concealed information list creation unit that creates an association list of concealed information with index information; an analysis instruction information creation unit; an analysis execution unit; a utilization information list creation unit that creates a list of the index information associated with the concealed information used in analysis; a first conversion list creation unit that creates a list having utilization index information converted by a first function having an inverse function; a second conversion list creation unit that creates a list to be converted by a second function in which a value of the index information is a fixed value if a parameter value is identical upon making the data conversion; a third conversion list creation unit that creates a list having second conversion index information converted by the inverse function; and the number-of-pieces of analysis utilization determination unit that determines the number of pieces of the concealed information used in analysis on the basis of the number of pieces of third conversion index information of the same value as the fixed value.SELECTED DRAWING: Figure 1