Encrypted Title Key Attachment for Synchronized Content Transmission
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Solution Overview
Problem
Current digital content transmission systems face challenges in maintaining synchronization between encrypted content and corresponding keys, leading to potential decryption issues and latency in random access, particularly in Digital Rights Management Systems (DRMS) and Conditional Access Systems (CAS).
Innovation Solution
The method involves encrypting a title key with a key encrypting key and attaching it to the encrypted content as a header extension, allowing for synchronized transmission and storage, ensuring that the encrypted key and content are received as a single stream, thereby maintaining compatibility with existing standards and enabling random access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the title key is transmitted separately from the encrypted content, then the transmission process can be simpler, but synchronization between the key and content is lost and decryption fails
Solution Approach 1:
The patent merges the title key and encrypted content into a single integrated transmission stream. The title key is encrypted with a key encrypting key and attached to the encrypted content, allowing both to be transmitted together as one unit. This ensures synchronization is maintained while the transmission process remains straightforward, as the receiver simply needs to process the integrated stream to extract and decrypt the content using the accompanying key.
2Adaptability or versatility
If the title key is transmitted as a separate stream, then transmission flexibility is improved, but random access to content is blocked due to latency
Solution Approach 1:
By combining the title key and encrypted content into a single transmission stream, the patent eliminates the latency issues that arise when keys and content are transmitted separately. The receiver can immediately process the integrated stream, extracting the key and decrypting the content without waiting for separate key transmissions, thereby enabling rapid random access while maintaining transmission flexibility.
3Object-affected harmful factors
If multiple keys are used to encrypt different content packets, then security is enhanced, but synchronization maintenance becomes more complex
Solution Approach 1:
The patent maintains the security benefits of using multiple keys for different content packets while simplifying synchronization maintenance. Each content packet is encrypted with its corresponding title key, and the title key itself is encrypted with a key encrypting key and attached to the content. This integration ensures that each packet comes with its correct key, eliminating synchronization complexity while preserving the enhanced security provided by multiple keys.
4Reliability
If the title key is encrypted and attached to the content, then synchronized transmission is achieved, but the data structure becomes more complex
Solution Approach 1:
The patent employs a nested structure where the title key is encrypted with a key encrypting key and attached to the encrypted content. This nested arrangement maintains synchronized transmission by ensuring the key and content travel together, while the nested structure itself manages the complexity through a clear hierarchical organization: outer encryption layer (key encrypting key), inner encryption layer (title key), and content layer.
Data Source
AI summary
A method and system for attaching a title key to encrypted content for synchronized transmission to, or storage by, a recipient is provided. Specifically, under the present invention, an elementary media stream is parceled into content units that each include a content packet and a header. The content packets are encrypted with one or more title keys. Once the content packets have been encrypted, the title keys are themselves encrypted with a key encrypting key. The encrypted title keys are then attached to the corresponding encrypted content packets for synchronized transmission to a recipient.