Audio Content Protection Using Embedded Processor Key Exchange
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Solution Overview
Problem
Current audio content protection methods rely on hard-coded global keys and simple key exchanges, which are not robust and can be vulnerable to attacks, especially in High Definition Audio (HD-Audio) codecs, leading to a 'break once attack all' scenario and increased complexity in hardware implementation.
Innovation Solution
Implementing an embedded processor for cryptographic key exchange with audio software applications, using a key exchange communication path and a Crypto Widget within the HD-Audio codec for authentication, session key generation, and decryption, while sharing a single Crypto Widget among multiple codecs to reduce redundancy and enhance security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a hard-coded global key and simple key exchange are used, then the hardware implementation complexity is reduced, but the security reliability deteriorates due to vulnerability to 'break once attack all' scenarios
Solution Approach 1:
The patent segments the content protection functionality by introducing per-session keys instead of a single global key. Each audio session has its own unique key, and the key exchange mechanism is divided into multiple steps involving certificate authentication, key generation, and key wrapping/unwrapping operations distributed across different hardware components (audio codec, embedded processor, audio software application). This segmentation prevents a single key compromise from affecting all sessions.
Solution Approach 2:
The patent introduces an embedded processor as an intermediary component between the audio software application and the audio codec. This intermediary handles the complex cryptographic operations (certificate verification, key generation, key wrapping/unwrapping) that would otherwise need to be implemented in hardware within the audio codec itself, reducing the hardware complexity while maintaining security.
2Reliability
If each audio codec implements a dedicated content protection session manager, then the security reliability is improved, but the device complexity increases due to redundancy
Solution Approach 1:
The patent implements a universal content protection session manager that can serve multiple audio codecs. The embedded processor and associated cryptographic infrastructure are shared across different audio codec devices, allowing a single implementation to provide content protection for multiple codecs without requiring each codec to have its own dedicated session manager hardware.
Solution Approach 2:
The patent merges the content protection session management functionality into a shared system that operates across multiple audio codecs. The embedded processor handles session management for all codecs centrally, and the cryptographic operations are consolidated in a shared infrastructure rather than being replicated in each codec, thereby reducing overall system complexity.
3Reliability
If a dedicated decryption engine is implemented in each audio codec, then the security reliability is improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The patent implements a universal decryption engine that can service multiple audio codecs through the shared content protection session manager. Instead of each codec having its own dedicated decryption hardware, a single decryption engine in the shared infrastructure handles decryption requests from multiple codecs, reducing manufacturing costs and complexity while maintaining security through per-session key management.
Data Source
AI summary
In some embodiments an embedded processor is to participate in cryptographic key exchange with an audio software application, and a key exchange communication path is coupled between the audio software application and the embedded processor. Other embodiments are described and claimed.