Image verification system, image verification apparatus, amd image verification method

An image verification system comprising an image generation apparatus, information processor, and first image verification apparatus, wherein:

• said image generation apparatus comprises:
• image generation means for generating image data,
• hash value generation means for generating a hash value of said image data, and
• first verification data generation means for generating first verification data using said hash value and common information;
• wherein said information processor sends said hash value and said first verification data to said first image verification apparatus;
• and
• said first image verification apparatus comprises:
• first verification means for verifying whether said image data has been altered, by using said hash value, said first verification data, and said common information, and
• second verification data generation means for generating second verification data for said image data using said hash value and secret information if said image data has not been altered.