Challenge-Response Authentication for Replay Attack Prevention
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Solution Overview
Problem
Existing methods for encrypting image data in digital cameras using the outer key model with device authentication are inefficient due to redundant processing procedures, functional complexities, and vulnerability to replay attacks, especially when using the two-pass authentication method with common-key cryptographic models.
Innovation Solution
A data processing method that involves transmitting data to a partner device, receiving encrypted key information, and authenticating the device using a challenge-response mechanism to prevent replay attacks and simplify the authentication process, while ensuring secure key management and efficient message exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the two-pass authentication method with common-key cryptographic model is used, then device authentication is achieved, but the system becomes vulnerable to replay attacks and requires redundant processing procedures
Solution Approach 1:
The patent applies preliminary action by pre-sharing secret keys between the image input apparatus and the information holding device before authentication. This allows the system to perform rapid challenge-response authentication without complex key exchange procedures during actual authentication, thereby reducing authentication procedure complexity while maintaining security against replay attacks through the use of random challenges.
2Reliability
If the outer key method with device model is used, then key information security is improved, but processing procedures become more complex
Solution Approach 1:
The patent merges device authentication and key information transfer into a single integrated process. The information holding device both authenticates itself to the image input apparatus and simultaneously provides the decryption key, eliminating the need for separate authentication and key exchange procedures. This reduces processing procedure complexity while maintaining the security benefits of the outer key method with device model.
3Reliability
If mutual authentication is implemented between digital camera and device, then authentication reliability is improved, but processing procedures increase
Solution Approach 1:
The patent extracts the authentication function from the information holding device and concentrates it in the image input apparatus. The device simply provides challenge-response verification and key information, while the apparatus performs the authentication logic and key management. This extraction reduces the processing burden on the device and improves overall authentication efficiency while maintaining mutual authentication reliability.
Data Source
AI summary
To realize device authentication which is highly resistant to attacks with simple procedures. Hence, an authentication unit of an image input apparatus transmits first data to an authentication unit of an information holding device, and receives, from the authentication unit, encrypted key information and second data which is generated from the first data. The authentication unit authenticates a partner device based on the first data and second data. In the case that authentication is successful, the authentication unit of the image input apparatus decrypts the encrypted key information to acquire key information. Then the image input apparatus encrypts data using the key information, and transmits the encrypted data to the partner device.