| 摘要 |
<p>A de-identification device is provided for automatically configuring a general hierarchy tree of attribute values in protection technology of identity information. In addition, the provided de-identification device quantitively evaluates the amount of information which is lost when generalizing an attribute value, and can thereby automatically assess priorities between de-identified data and between data that is being de-identified. Information of each person includes attribute values of the person for a plurality of attributes. De-identification is achieved by obfuscating the attribute values, and a structure in which attribute values to be obfuscated are expressed in a tree structure according to the level of obfuscation is called a general hierarchy tree. The disclosed identity information de-identification device achieves automatic configuration by configuring a tree using frequency information of attribute values. In addition, by defining a lost information amount metric means, using the general hierarchy tree, in formation amount loss between two de-identified data or between data being de-identified is quantitively assessed.</p> |
