Smart TV Trust Chain via Multi-Stage CA Issuance
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Solution Overview
Problem
Smart television terminals face security risks due to the potential leakage of private keys and unauthorized issuance of device certificates, compromising the uniqueness and confidentiality required for secure communication and authentication.
Innovation Solution
A method for establishing a trust chain in smart television terminals involves requesting a third CA for a third key pair and certificate, writing the private key and certificate into a security storage area, and generating a unique fourth key pair upon startup to request a fourth certificate from a fourth CA, ensuring secure online issuance and storage of certificates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device certificate and private key are pre-stored or issued online to the smart television terminal, then the terminal can perform secure communication and authentication functions, but there is a security risk that the private key might be leaked or the certificate might be issued to an illegal terminal without sufficient security authentication
Solution Approach 1:
The patent divides the certificate issuance process into multiple stages with different CAs (first CA for chip, second CA for terminal, third CA for model-specific certificates). Each stage handles a specific aspect of security, preventing any single point of failure and reducing the risk of comprehensive key leakage while maintaining authentication capabilities.
Solution Approach 2:
The patent introduces multiple Certificate Authorities as intermediaries between the terminal and the security infrastructure. These CAs act as trusted mediators that verify terminal identity and issue certificates without exposing the private key generation process, thereby reducing the risk of unauthorized certificate issuance while enabling secure communication.
2Ease of manufacture
If a single certificate issuance method is used for all smart television terminals, then the process is simple, but it cannot ensure the uniqueness and confidentiality requirements for different terminal models and chips
Solution Approach 1:
The patent implements local quality by creating model-specific certificates issued by a third CA that are tailored to each terminal model's characteristics. This allows the system to maintain simple issuance processes for common tasks while providing enhanced, customized security for specific terminal models and chip combinations, ensuring uniqueness without sacrificing overall process efficiency.
Data Source
AI summary
Method for establishing a trust chain, comprising: requesting a third CA for a third key pair and a third certificate, writing a private key of the third key pair and the third certificate into a security storage area, the third certificate comprising model information of the smart television (SMTV) terminal and information of a public key of the third key pair. The SMTV terminal check its possession of a fourth certificate on every start, generate a unique fourth key pair in absence of a fourth certificate, submit online a public key of the fourth key pair and a unique identification of each SMTV terminal to a fourth CA to request for a fourth certificate, and send along the third certificate and a signature signed on the request with the private key of the third key pair; write the fourth certificate into the security storage area upon receiving the fourth certificate.