Content Delivery Network File Sharing via Segmented Encryption
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Solution Overview
Problem
Satellite television systems face inefficiencies in resource usage and piracy concerns due to broadcasting content to all users simultaneously, making it costly to deliver content desired by a small number of customers and requiring secure authorization and storage methods.
Innovation Solution
A method of dividing content into crucial and non-crucial portions, encrypting the crucial portions differently for each user using conditional access encryption, and communicating them separately from the non-crucial portions, allowing users to assemble the complete content securely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If content is broadcast to all users simultaneously via satellite, then all users can access the content, but satellite resource usage increases and it becomes costly to deliver content desired by a small number of customers
Solution Approach 1:
The content file is divided into multiple portions, with at least one crucial portion and multiple non-crucial portions. This segmentation allows the system to selectively broadcast different portions to different user groups, enabling targeted content delivery and reducing unnecessary satellite resource consumption for users who don't need the complete content.
Solution Approach 2:
Different portions of the content are assigned different security clearances and encryption levels. The crucial portion has higher security requirements while non-crucial portions have lower requirements. This local quality differentiation allows the system to optimize satellite resource usage by broadcasting less secure non-crucial portions more freely while maintaining security for crucial portions.
2Reliability
If traditional broadcast encryption is used, then content can be delivered to multiple users, but security is compromised because all users receive the same encrypted content
Solution Approach 1:
The content is segmented into portions with different security clearances, and each portion is encrypted with appropriate encryption strength. This allows the system to provide strong encryption for crucial portions while using lighter encryption for non-crucial portions, achieving both high security and adaptability to different user needs.
Solution Approach 2:
The encryption parameters are changed based on the user's security clearance level. Users with higher clearance receive crucial portions with stronger encryption, while users with lower clearance receive only non-crucial portions with weaker encryption. This dynamic parameter adjustment enables user-specific encryption while maintaining system-wide security.
3Reliability
If crucial portions are encrypted differently for each user, then security is enhanced, but device complexity increases due to multiple encryption/decryption operations
Solution Approach 1:
By segmenting content into crucial and non-crucial portions with different security requirements, the system reduces the number of complex encryption operations needed. Only crucial portions require user-specific encryption, while non-crucial portions can be broadcast more simply, thereby reducing overall device complexity while maintaining security.
4Ease of operation
If all content portions are transmitted to all users, then content availability is maximized, but piracy risk increases
Solution Approach 1:
The content is divided into portions that can be selectively distributed. Non-crucial portions can be made more accessible to multiple users for ease of operation, while crucial portions remain restricted and securely distributed only to authorized users, thereby reducing piracy risk while maintaining content accessibility.
Solution Approach 2:
Different security measures are applied to different portions of the content based on their criticality. Non-crucial portions have lower security restrictions allowing broader access, while crucial portions have higher security restrictions to prevent piracy. This local quality approach balances accessibility and security.
Data Source
AI summary
A communication system and method for operating the same includes a group of user devices and a content delivery network in communication with the group of user devices. The content delivery network selects a plurality user devices from the group of user devices, divides the content into a crucial portion and a non-crucial portions, and encrypts the crucial portions differently for each of the user devices in the group using conditional access encryption. The content delivery network communicates the non-crucial portions to the plurality of user devices, communicates the encrypted crucial portion to the plurality of user devices separately from the non-crucial. The plurality of user devices assembles the crucial portion and the non-crucial portions to form the content.