Communication Device TLS Selection for Secure Compatibility
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Solution Overview
Problem
Existing communication systems face challenges in ensuring secure communication using the Transport Layer Security (TLS) protocol, particularly due to the disparity in compatibility and security levels between different versions, leading to potential vulnerabilities when less secure encryption schemes are used.
Innovation Solution
A communication device capable of supporting multiple TLS versions and encryption schemes, with a controller that determines the most secure version and encryption scheme based on received setting requests or candidate information, ensuring secure communication by avoiding the use of less secure options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a communication device supports multiple TLS versions and encryption schemes, then compatibility with different communication partners is improved, but the complexity of selecting the appropriate version and scheme increases
Solution Approach 1:
The communication device performs preliminary actions by obtaining candidate information from the other device before finalizing the TLS version and encryption scheme selection. This advance preparation allows the device to filter compatible options and make informed decisions, reducing the complexity of the selection process while maintaining compatibility across different devices
Solution Approach 2:
The device dynamically changes parameters (TLS version and encryption scheme) based on the candidate information received from the other device. By adjusting these parameters according to the specific communication context and device capabilities, the system achieves both compatibility and simplified selection through context-aware adaptation
2Reliability
If the system automatically selects the most secure encryption scheme, then communication security is improved, but the risk of incompatibility with older devices increases
Solution Approach 1:
The system dynamically adjusts the security level by selecting from multiple encryption schemes based on the capabilities of the communicating devices. Rather than using a fixed high-security setting that may cause incompatibility, the device adapts its security configuration in real-time based on the other device's supported schemes, ensuring both security and compatibility
Solution Approach 2:
The TLS version and encryption scheme parameters are changed based on the candidate information received from the other device. This parameter adaptation allows the system to optimize for security when possible while falling back to compatible (though potentially less secure) options when necessary, balancing security requirements with compatibility constraints
3Ease of operation
If the communication device sends all available version and scheme information to the other device, then the other device can make an informed selection, but the amount of data transmitted increases
Solution Approach 1:
The device extracts only the necessary candidate information (supported TLS versions and encryption schemes) from its full capability set and transmits this filtered information to the other device. By taking out only the relevant subset of information needed for protocol negotiation, the system enables informed selection while minimizing data transmission volume
Solution Approach 2:
The device performs preliminary filtering of its capability information before transmission, preparing only the candidate versions and schemes that are relevant for the current communication context. This preliminary action reduces the data transmission volume while still providing the other device with sufficient information to make informed selection decisions
Data Source
AI summary
In a case where a first communication device obtains a first setting request not including first version information indicating a first version of an encrypted communication protocol but including second version information indicating a second version of the encrypted communication protocol, the first communication device may send first setting information to a second communication device, the first setting information including the second version information and second scheme information indicating a second encryption scheme but not including first scheme information indicating a first encryption scheme which is less secure than the second encryption scheme.