Decrypting overlapping selected and encrypted image areas

Details Decrypting overlapping selected and encrypted image areas Decrypting overlapping selected and encrypted image areas

2011-06-28

2011-06-28

Gee, Jason K (Department: 2434)

Cryptography

Facsimile cryptography

C713S176000

Reexamination Certificate

active

07970139

ABSTRACT:
The present invention aims to provide the technique of appropriately enabling the encryption and decryption to the partial area with respect to the image data to which the partial encryption and the multiple encryptions have been applied. More specifically, the predetermined image area in the image data is acquired by a reproduction area designation unit, the overlap area of the acquired image area and the encrypted encryption area is calculated by an overlap judgment unit, the key information corresponding to the calculated overlap area is acquired by a decryption key acquisition unit, and the image data corresponding to the overlap area is subjected to the encryption and decryption by an image decryption unit by using the acquired key information.

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