Information processing method and apparatus, computer program, and computer-readable storage medium
US7356148B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 17, 2003 |
| Grant date | Apr 8, 2008 |
| Priority date | — |
| Expiry date | Dec 27, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0836
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Image data encoded in units of a tile is processed to define a hierarchical structure by repeatedly forming one tile group from adjacent tiles and another tile group from adjacent tile groups. Plural partially encoded data a tile located at a terminal of the hierarchical structure are arranged in ascending order of priority of decryption to define a tree having as nodes tile groups, tiles, and partially encoded data. Encryption key information is generated for a node located at an uppermost layer of the tree and, up to a node located at a terminal, encryption key information is generated for a node of interest based on encryption key information for a node at an upper layer. When a node of partially encoded data is designated as an object to be encrypted, partially encoded data at a higher layer containing the designated object is set as an object to be encrypted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.