Audio Data Protection via API Interception and Encryption
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Solution Overview
Problem
The protection of audio data transmission from microphones to application processes is compromised in modern operating systems, particularly with the advent of Windows Vista, as the Windows Kernel Streaming technology becomes unsuitable due to audio traffic being routed through private COM interfaces and Direct Access Memory, making it difficult to intercept and filter unauthorized access.
Innovation Solution
A method involving a processor that allocates data buffers for software processes, encrypts audio data from audio endpoint devices, and uses API function call interceptors to manage access, determining process authenticity through identifiers and databases of known viruses, ensuring only authorized processes access encrypted audio data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If audio traffic is routed through private COM interfaces and Direct Access Memory in Windows Vista and later, then audio transmission speed and efficiency are improved, but the ability to intercept and filter unauthorized access is lost
Solution Approach 1:
The patent introduces an intermediary component that intercepts API function calls between applications and the audio subsystem. This mediator monitors and controls access to audio data without disrupting the direct memory access path, allowing both high-speed transmission and reliable access control to coexist.
Solution Approach 2:
The patent segments the audio data access path into multiple controlled points. By dividing the monolithic audio subsystem into separable components with distinct access control mechanisms, it enables independent optimization of speed and security without compromising either aspect.
2Reliability
If a filter is installed in the Windows Kernel Streaming technology region, then unauthorized access can be blocked, but the filter becomes absolutely unsuitable for Windows Vista and later systems
Solution Approach 1:
The patent implements a dynamic access control mechanism that adapts to different operating system architectures. Rather than using a static filter that only works with Kernel Streaming, the system dynamically intercepts API calls at the appropriate layer, making it compatible with both older and newer Windows versions including Vista and later.
Solution Approach 2:
The patent changes the operational parameters of access control from kernel-level streaming interception to user-mode API function call interception. This parameter change allows the same access control logic to function across different operating system versions and audio architectures without requiring modification.
3Productivity
If audio data is placed in a protected process buffer without interception, then direct access memory efficiency is improved, but security against eavesdropping is compromised
Solution Approach 1:
The patent performs preliminary encryption of audio data before it is placed in the protected process buffer. By encrypting the data in advance, the system maintains direct memory access efficiency while ensuring that even if unauthorized access occurs, the stolen data remains encrypted and unusable.
Solution Approach 2:
The patent replaces physical/mechanical access control (filters and interceptors in the audio stream) with cryptographic protection. Instead of trying to physically prevent access to memory buffers, the system uses encryption to protect the confidentiality of audio data, allowing efficient direct memory access while maintaining security.
Data Source
AI summary
Disclosed are systems and methods for protecting transmission of audio data from microphone to application process. An exemplary method includes receiving a request from a software process to obtain an audio stream from an audio endpoint device; allocating a data buffer for the software process; processing and encrypting audio data received from the audio endpoint device by audio processing objects; storing the encrypted audio data in the allocated data buffer; installing an interceptor of a API function call for the software process; and decrypting the encrypted audio data from the allocated data buffer by the software process using the interceptor of the API function call.