Camera Image Authentication Circuit Using Partial-Region MAC Tags
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Solution Overview
Problem
Existing automotive camera systems lack effective security measures to authenticate legitimate camera sensors and prevent forged or falsified images, which can compromise safety and lead to fatal accidents in autonomous driving systems.
Innovation Solution
A security device and system on chip (SOC) are implemented to authenticate camera sensors and verify the authenticity of transmitted images using a security circuit and security processor, generating and comparing message authentication codes (MAC) on selected image regions to ensure the image is not forged or falsified.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a security device is added to authenticate camera sensors and verify image authenticity, then security function is improved, but device complexity increases
Solution Approach 1:
The security device is integrated within the camera device structure, with the security circuit embedded in the camera module and the SOC containing both the image processor and security processor. This nested architecture allows security functions to be incorporated without significantly increasing overall device complexity, as the security components are housed within existing structural frameworks.
Solution Approach 2:
The security verification process is divided into distinct functional components: the security circuit generates MAC values for image regions, the SOC receives and processes these values separately from main image processing, and the security processor independently verifies authenticity. This segmentation allows each component to perform its specific security function efficiently without overwhelming the entire system.
2Measurement precision
If MAC generation and verification is performed on the entire image, then authentication accuracy is improved, but processing time increases
Solution Approach 1:
The image is divided into multiple distinct regions, and the security circuit generates MAC values for each region separately. This segmentation allows parallel processing of different image portions, reducing the total time required to authenticate the entire image while maintaining comprehensive coverage of all critical areas.
Solution Approach 2:
Instead of processing every single pixel uniformly, the system applies MAC generation to selectively important regions of the image. This partial action approach focuses computational resources on critical areas that most impact authentication accuracy, achieving sufficient security verification without the time cost of exhaustive full-image processing.
3Reliability
If security processing is performed on all image regions, then security coverage is improved, but processing load increases
Solution Approach 1:
The image processing load is segmented across multiple components: the security circuit handles MAC generation for specific regions, the image processor manages overall image data flow, and the security processor handles verification. This distribution of processing tasks reduces the burden on any single component while maintaining comprehensive security coverage across all necessary image regions.
Solution Approach 2:
The system performs security processing on selectively important regions rather than uniformly across the entire image. This partial processing approach reduces overall computational load and power consumption while maintaining adequate security coverage for critical areas that most impact system safety and reliability.
Data Source
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AI summary
A security device providing a security function for an image, a camera device (400) including the same, and a system on chip (SOC) (401) for controlling the camera device (400 are provided. An image transmitting device (100) may include an image processor (410) configured to process an image to be transmitted to an external device (401), and a security circuit (430) including a key shared with the external device (401). The security circuit (430) may be configured to generate a tag used for image authentication by using data of a partial region (Image_p) of the image and the key based on region information (Info_reg) for selecting the partial region of the image. The image transmitting device (400) may be configured to transmit the tag, generated to correspond to the image, to the external device (401) with data of the image.