Data process apparatus and method therefor
AssigneeCanon Kabushiki Kaisha
InventorsNobuhiro Tagashira, Keiichi Iwamura, Junichi Hayashi, Yuji Suga
Life of this patent
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Abstract
In an image process apparatus, a key different for each hierarchy is generated on the basis of a specific key with respect to image data having a hierarchical structure, the image data in each hierarchy is enciphered using the generated key for each hierarchy, and the specific key is managed, so that key management can be easily performed while the image data having a hierarchical structure is enciphered using the key different for each hierarchy.
Claims18
A data process apparatus comprising:
- key convert means for generating a key different for each hierarchy on the basis of a specific key with respect to data having a hierarchical structure;
- and
- encipher means for enciphering data in a predetermined hierarchy using a key in the hierarchy.
A data process apparatus comprising:
- key convert means for generating a key different for each hierarchy on the basis of a specific key with respect to data which has a hierarchical structure and is enciphered by a key different for each hierarchy;
- and
- decode means for decoding data in a predetermined hierarchy using a key in the hierarchy.
A data process apparatus comprising decode means for using a certain key to decode data in a hierarchy corresponding to the key and lower hierarchies with respect to data which has a hierarchical structure and is enciphered by a key different for each hierarchy.
A data process apparatus comprising decode means for decoding the enciphered key and decoding data in a hierarchy corresponding to the key and the lower hierarchies using the decoded key with respect to data which has a hierarchical structure and is enciphered by a key different for each hierarchy and an enciphered key obtained by enciphering one key out of keys in the hierarchy.
A data process method comprising;
- a key convert step of generating a key different for each hierarchy on the basis of a specific key with respect to data having a hierarchical structure;
- and
- an encipher step of enciphering data in a predetermined hierarchy using a key in the hierarchy.
A data process method comprising:
- a key convert step of generating a key different for each hierarchy on the basis of a specific key with respect to data which has a hierarchical structure and is enciphered by a key different for each hierarchy;
- and
- a decode step of decoding data in a predetermined hierarchy using a key in the hierarchy.
A data process method comprising:
- a decode step of using a certain key to decode data in a hierarchy corresponding to the key and the lower hierarchies with respect to data which has a hierarchical structure and is enciphered by a key different for each hierarchy.
Dependencies are inferred from the claim text.