CSI-2 Extended Packets With Timed Security Messages
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Solution Overview
Problem
The existing CSI-2 packet structures are inadequate for supporting various applications, including in-vehicle and IoT uses, and the use of a 16-bit message count value for functional safety can be diverted as a nonce value for security, which is not suitable for countermeasures against attacks.
Innovation Solution
An information processing device and communication system that transmits and receives extended packets with a unique message to indicate abnormal states, using a session key for protection data and ensuring different timings for image data and unique message transmission via a common communication path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 16-bit message count value is used as a nonce value for security, then security functionality is enabled, but it is not suitable for countermeasures against attacks due to rollover issues
Solution Approach 1:
The patent segments the transmission process into two distinct parts: image data transmission and unique message transmission. The unique message (containing the nonce value) is transmitted separately from the image data, allowing independent timing control. This segmentation enables the nonce to be transmitted at a different timing via the common communication path, preventing attackers from predicting or manipulating the nonce value while maintaining security functionality.
2Productivity
If image data and unique message are transmitted via a common communication path at the same time, then communication efficiency is improved, but security is compromised due to potential timing attacks
Solution Approach 1:
The patent implements preliminary action by transmitting the unique message (containing the nonce value) at a different timing from the image data transmission. The nonce is transmitted first or at a predetermined timing before the main image data flow, allowing the receiving device to prepare security verification in advance. This preliminary transmission of security-critical information prevents timing attacks while maintaining efficient use of the common communication path.
3Adaptability or versatility
If existing packet structures are used, then compatibility with current systems is maintained, but they cannot support various applications including in-vehicle and IoT uses
Solution Approach 1:
The patent applies the nesting principle by embedding a unique message packet within the existing extended packet structure. The unique message is nested as a separate packet entity within the CSI-2 communication stream, containing its own header and data fields. This nested structure allows the system to maintain compatibility with existing CSI-2 infrastructure while adding new functionality for secure transmission in diverse applications like in-vehicle and IoT systems.
Data Source
AI summary
The present disclosure relates to an information processing device, a mobile device, and a communication system for enabling further enhancement of safety. When communication is performed with another information processing device to perform high-speed data transmission of transmitting data of a frame including image data, an extended packet including an extended packet header and packet data, and a unique message capable of notifying that at least one of an information processing device, the another information processing device, or the image data is in a state different from a normal time or a usual time are transmitted to the another information processing device or received from the another information processing device, a session key is derived and at least one of generation, verification, or decryption of protection data of the unique message is executed, the image data is stored in the packet data, and the image data and the unique message are transmitted at different timings via a part or whole of a common communication path regarding the communication. The present technology can be applied to, for example, a communication system conforming to an MIPI standard.