Management device and image processing system

A management device comprising:

• a resolution converter which converts input image data to N types (N is a plural number) of image data having resolutions different with each other;
• a difference image generating unit which generates a plurality of pieces of difference data which is a difference between image data with m-th resolutions (m is an integer equal to or more than 1 and equal to or less then N−1) and image data with m+1-th resolutions;
• a secret sharing unit which performs secret sharing schemes so that the plurality of pieces of difference data is respectively divided into n pieces (n is an integer equal to or more than N+1 and the same value in all of difference data) of distributed data and the distributed data is reconstructed to original difference data using k pieces (k is an integer equal to or more than 2 and equal to or less than n and different value for each piece of difference data) among n pieces;
• and
• a data combination unit which generates n pieces of combination data by combining distributed data selected one by one so as not to overlap with each of resolutions and stores each piece of the combination data in different storages.