Fallback Certificate Authentication for Secure Device Startup
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Solution Overview
Problem
The generation of unique public/private key pairs for consumer electronic devices during startup is computationally expensive and delays the secure connection process, especially when certificates expire, requiring a method to facilitate immediate authentication without waiting for key pair generation.
Innovation Solution
Incorporating a fallback certificate and key pair within the firmware, allowing the device to use the fallback for initial authentication and generating a new certificate in the background once started, ensuring seamless startup and subsequent secure connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a unique certificate and public/private key pair are generated during startup, then device authentication security is improved, but startup time is significantly increased due to computational expense
Solution Approach 1:
A fallback certificate and key pair are pre-generated and embedded in the firmware during manufacturing, before the device is deployed. This preliminary action allows the device to immediately use the pre-prepared fallback credentials for authentication without waiting for expensive on-demand key pair generation, thus resolving the contradiction between security and startup time.
2Reliability
If certificate generation is performed on-demand during startup, then each device uses unique credentials improving security, but the computationally expensive key pair generation delays service availability
Solution Approach 1:
The fallback certificate and key pair are prepared in advance during firmware manufacturing, eliminating the need for time-consuming on-demand generation. This allows the device to immediately authenticate and become available for service while maintaining unique credentials through the device-specific fallback certificate.
Solution Approach 2:
Instead of generating new key pairs during startup, the system uses a copy (fallback certificate) that was pre-created during manufacturing. This copying approach avoids the computational expense of real-time key pair generation while still providing unique authentication credentials for each device.
3Ease of operation
If certificates are embedded in firmware during manufacturing, then device authentication is simplified, but all devices share the same credentials creating security vulnerabilities
Solution Approach 1:
While the fallback certificate is embedded in firmware for all devices (providing ease of operation), each device receives a unique device-specific identifier or customization that distinguishes its credentials. This local quality differentiation ensures that even though all devices use the same fallback certificate structure, each device's authentication is unique and secure.
Solution Approach 2:
During manufacturing, each device is preliminarily configured with unique identifiers or customized fallback credentials specific to that device, even though the fallback certificate mechanism itself is universal. This preliminary customization prevents the security vulnerability of identical credentials across all devices while maintaining the simplicity of embedded firmware authentication.
Data Source
AI summary
A system and method for of providing secure communication between a client device having a non-volatile read only memory and a first server is disclosed. One embodiment is evidenced by a method that comprises determining if a generation of a certificate is complete, the certificate generated in the client device and having a public key generated from a private key, providing the generated certificate to the first server to authenticate the client device if the generation of the certificate is complete, and retrieving a fallback certificate from the non-volatile read only memory and providing the fallback certificate to the first server to ephemerally authenticate the client device until the generated certificate is provided to the first server if the generation of the certificate is not complete.