Virtual Channel Encryption for Image Sensor Data Security
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Solution Overview
Problem
Current methods for transmitting image data from image sensors to application processors lack secure mechanisms, particularly in preventing malicious attacks such as hijacking or spoofing of camera management commands over I2C channels, and do not effectively protect sensitive information like biometric or infrared data.
Innovation Solution
The implementation of virtual channel-based encryption between application processors and image sensors, where an encryption key is detected and stored by the image sensor, and used to form an encrypted virtual channel for secure transmission of image data, preventing unauthorized access and ensuring secure data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image data is transmitted using standard communication channels, then data transmission is simple and fast, but the transmission is vulnerable to malicious attacks and spoofing
Solution Approach 1:
The patent segments the transmission channel into multiple virtual channels, each with its own encryption key. This allows selective encryption of sensitive data streams while maintaining unencrypted transmission for non-sensitive data, resolving the contradiction between security and complexity by applying encryption only where necessary.
Solution Approach 2:
The patent introduces an encryption intermediary layer that sits between the image sensor and processing unit. This intermediary encrypts/decrypts data streams using virtual channel keys, providing security without requiring complex modifications to the existing transmission infrastructure.
2Reliability
If encryption is applied to all data channels, then security is improved, but processing overhead and transmission efficiency decrease
Solution Approach 1:
The patent applies different quality levels of security to different data streams. Sensitive biometric and infrared data are transmitted through encrypted virtual channels, while non-sensitive data uses unencrypted channels. This local differentiation of security measures improves overall security for sensitive data without degrading the transmission efficiency of non-sensitive data.
Solution Approach 2:
Instead of encrypting all data channels (excessive action), the patent encrypts only the virtual channels carrying sensitive information (partial action). This selective approach provides adequate security for critical data while avoiding the performance penalty of encrypting all transmission channels.
3Reliability
If separate links are used for commands and image data, then security is improved, but the system complexity and resource usage increase
Solution Approach 1:
The patent merges command and data transmission into a single physical link while maintaining logical separation through virtual channels. Each virtual channel is independently encrypted with its own key, providing security equivalent to separate physical links while using shared physical infrastructure, thus reducing system complexity.
Solution Approach 2:
The patent transitions from physical separation (separate links) to logical separation (virtual channels) as the dimension of differentiation. This allows multiple secure communication paths to coexist on a single physical link, reducing hardware complexity while maintaining security through virtual channel isolation and individual encryption keys.
Data Source
AI summary
In one example, a system for transmitting encrypted data includes a processor to select a virtual channel to be encrypted between an application processor and an image sensor during an initialization process. The processor can also transmit a virtual channel command corresponding to the selected virtual channel to the image sensor. The processor can also poll a register in the image sensor to verify the image sensor has stored an encryption key corresponding to the selected virtual channel and detect image data from the image sensor via the virtual channel, the image data encrypted with the encryption key.