SIM-Based Pseudonym Certificates for Private IoT Authentication
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Solution Overview
Problem
Traditional PKI models for securing IoT devices face scalability and privacy issues, with potential data leakage and device tracking during TLS handshakes, overburdening infrastructure when applied to large numbers of devices.
Innovation Solution
Utilizing a subscriber identity module (SIM) as a pseudonym certificate authority (PCA) to validate device identities and issue short-live certificates, acting as both a Registration Authority and Certificate Authority, ensuring device authentication and anonymization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PKI models are used for securing IoT devices, then authentication and encryption are provided, but scalability and privacy are compromised
Solution Approach 1:
The patent segments the PKI infrastructure by introducing intermediate Certificate Authorities (CAs) between the root CA and IoT devices. This hierarchical segmentation allows the system to scale by distributing certificate issuance across multiple CAs, each serving specific device groups, thereby reducing the burden on a single centralized authority while maintaining authentication security.
Solution Approach 2:
The patent employs intermediate CAs as mediators between the root CA and IoT devices. These intermediate CAs issue certificates to devices and validate them during TLS handshakes, enabling scalable authentication without requiring all devices to directly interact with the root CA, thus improving both scalability and privacy.
2Reliability
If traditional PKI models are used for securing IoT devices, then authentication is provided, but device tracking and data leakage risks increase
Solution Approach 1:
The patent implements dynamic certificate issuance where intermediate CAs can issue and revoke certificates for IoT devices at any time. This dynamic approach allows the system to respond to security threats by revoking compromised certificates without affecting the entire PKI infrastructure, thereby preventing device tracking while maintaining authentication security.
Solution Approach 2:
The patent enables the discarding of compromised certificates through the revocation mechanism. When a device or certificate is compromised, the system can revoke and discard the affected certificates, preventing further use while maintaining the integrity of other certificates in the PKI infrastructure.
3Reliability
If all devices use traditional PKI models, then authentication is achieved, but infrastructure strain increases enormously
Solution Approach 1:
The patent segments the PKI infrastructure into multiple hierarchical levels with intermediate CAs distributing the certificate issuance workload. This segmentation reduces the infrastructure strain on any single component while maintaining authentication capability across all devices.
Solution Approach 2:
The patent enables intermediate CAs to autonomously issue and manage certificates for IoT devices without requiring constant intervention from the root CA. This self-service capability reduces the operational burden on the infrastructure while maintaining secure authentication.
Data Source
AI summary
A system or method for using a subscriber identity module (SIM) as a pseudonym certificate authority (PCA) to anonymize and mitigate the tracking of a device having the SIM. The system or method can include one or more processors that can validate a device identity presented by the device where the SIM serves as a Registration Authority and that can issue a new certificate in response to a certificate sign request (CSR) submitted by the device where the SIM serves as a Certificate Authority (CA). In some embodiments, the SIM is an applet stored within the device. In some embodiments, the SIM acts as the PCA to generate short-live end-entity certificates dedicated to sign broadcast messages. Other embodiments are disclosed.