Encrypted Content Search via ID-Sorted Key Lists
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Solution Overview
Problem
Conventional methods for searching encrypted content based on a content key in devices with limited processing ability, such as stationary or mobile AV devices, are inefficient due to the need for extensive data organization changes and correlation of ID information, making high-speed search difficult.
Innovation Solution
A method involving storing content files with encrypted content and ID information on one medium and key information, including encryption keys and ID associations, on another medium, with lists sorted by ID information to facilitate rapid search and decryption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If content keys and encrypted content are stored on different recording media with ID information correlation, then copyright protection and content distribution flexibility are improved, but search speed and processing efficiency deteriorate due to extensive data organization changes required
Solution Approach 1:
The patent introduces a list as an intermediary data structure that correlates ID information between content keys stored on one recording medium and encrypted content stored on another recording medium. This list acts as a mediator that enables efficient association and search without requiring extensive data organization changes, thus maintaining copyright protection flexibility while improving search performance.
Solution Approach 2:
The patent segments the storage system into separate recording media for content keys and encrypted content, with the list serving as a separate correlation mechanism. This segmentation allows independent optimization of each component while maintaining overall system functionality, enabling flexible content distribution without compromising search speed.
2Reliability
If ID information correlation is implemented between content keys and encrypted content, then content management reliability is improved, but device complexity increases due to extensive data organization requirements
Solution Approach 1:
The list serves as a simple intermediary structure that establishes reliable correlation between content keys and encrypted content through ID information without introducing complex data organization requirements. This intermediary approach maintains reliability while minimizing device complexity.
3Productivity
If encrypted content and content keys are stored on the same recording medium, then search efficiency is improved, but copyright protection capability deteriorates due to increased accessibility
Solution Approach 1:
The patent segments the storage of content keys and encrypted content onto different recording media, maintaining copyright protection capability. The list provides the necessary correlation functionality to achieve search efficiency despite this segmentation, thus resolving the contradiction between security and performance.
Data Source
AI summary
A method for performing a high-speed search for a content key associated with encrypted content for a key-separation-type content management method where content keys and pieces of encrypted content are correlated by ID information and stored in different recording media. An external recording medium stores content files including: pieces of encrypted content that are encrypted with different encryption keys; and content IDs, each associated with a corresponding piece of encryption content, and a semiconductor recording medium stores a list including: encryption key storage location information, each indicating where a corresponding encryption key is stored; and content IDs, the list sorted in accordance with the content IDs. When encrypted content is played back, the list is searched to find encryption key storage location information associated with content ID that matches the content ID of the encrypted content, and the encryption key is read based on the encryption key storage location information.