Patent ID: 7308577

Claim:
An image verification system comprising: an image generation apparatus; and a first verification apparatus, wherein said image generation apparatus includes: (a) an image generation unit operable to generate image data, (b) a hash value generation unit operable to generate a hash value from the image data, and (c) a first verification data generation unit operable to generate first verification data from the hash value using a common key cryptography and not using a public key cryptography, and wherein said first verification apparatus includes: (a) a receiving unit operable to receive the hash value and the first verification data, (b) a first verification unit operable to verify, using the received hash value, the received first verification data and the common key cryptography, whether the image data is altered, and (c) a second verification data generation unit operable to generate second verification data from the hash value using the public key cryptography, if the first verification unit verifies that the image data is not altered.