Cryptographic Module Secure Mode Key Storage
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Solution Overview
Problem
Current key management and distribution systems in automotive security face challenges in ensuring the secure generation and authentication of digital signatures, particularly in transitioning between secure and non-secure modes without compromising confidentiality and integrity of secret keys and seed values.
Innovation Solution
A cryptographic module is configured to operate in secure and non-secure modes, where the secret key and seed value are stored securely during the secure mode, and used to generate digital signatures in the non-secure mode without granting access to these sensitive elements, utilizing a true random generator to enhance entropy and prevent unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device operates in secure mode to store secret key and seed value, then security and confidentiality are improved, but the device cannot generate signatures efficiently
Solution Approach 1:
The device dynamically switches between secure mode and non-secure mode based on operational requirements. In secure mode, the secret key and seed value are stored with full protection. In non-secure mode, the device generates signatures using these values without requiring mode switching, thus maintaining both security and efficiency
2Productivity
If the device operates in non-secure mode to generate signatures, then signature generation efficiency is improved, but access to secret key and seed value may be compromised
Solution Approach 1:
The device introduces a controlled access mechanism where the secret key and seed value are made available to the signature generation process only under strict conditions: the device must be in non-secure mode, and the values are provided through a controlled interface that prevents unauthorized access while enabling efficient signature generation
3Adaptability or versatility
If the device transitions between secure and non-secure modes, then flexibility and adaptability are improved, but system complexity increases
Solution Approach 1:
The device performs preliminary configuration in secure mode where the secret key and seed value are stored. After this initial setup, the device operates in non-secure mode for signature generation without requiring frequent mode transitions. This preliminary action reduces the need for complex mode switching during normal operation
Data Source
AI summary
A device is suggested including a cryptographic module, wherein the device is operable in a secure mode and in a non-secure mode, wherein the cryptographic module is configured in the secure mode by storing a secret key and a seed value in the cryptographic module, and wherein the device is operable in the non-secure mode to generate a signature based on input data utilizing the secret key and the seed value. Also, a method for operating such device is provided.