Information processing apparatus and information processing method

An apparatus for generating validation data to validate alteration of image data, comprising:

• a separation unit which separates an image represented by the image data into a plurality of areas;
• a calculator which calculates a first area feature value and a second area feature value of each area, the first area feature value and the second area feature value being unchangeable when each area rotates;
• a sorter which sorts the second area feature values corresponding to the areas based on the first area feature values;
• and
• a validation data generator which generates, based on the sorted second area feature values, validation data to validate alteration of the image data.

A method of controlling an apparatus for generating validation data to validate alteration of image data, comprising:

• separating an image represented by the image data into a plurality of areas;
• calculating a first area feature value and a second area feature value of each area, the first area feature value and the second area feature value being unchangeable when each area rotates;
• sorting the second area feature values corresponding to the areas based on the first area feature values;
• and
• generating, based on the sorted second area feature values, validation data to validate alteration of the image data.