Conditional Message Routing for Roaming SMS Security
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Solution Overview
Problem
The reliability of visited network components, such as MSC/VLR, in telecommunications networks is questionable, particularly when a subscriber is roaming, making them vulnerable to malicious interceptions, as the home network lacks visibility and cannot verify the authenticity of responses from the subscriber device.
Innovation Solution
A conditional message routing method is implemented in the home network, where a reliability metric is evaluated for the visited network components, and messages are forwarded based on this assessment, using criteria such as previous communication success, encryption, and anomalous traffic patterns, to detect and prevent malicious components from intercepting SMS messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If messages are routed through visited network components when subscriber is roaming, then message delivery capability is improved, but security and reliability deteriorate due to lack of visibility and verification
Solution Approach 1:
The home network performs preliminary evaluation of the reliability metric for the visited network component before forwarding the message. This advance assessment allows the system to identify potentially malicious components and prevent message interception before it occurs, resolving the contradiction by ensuring security checks are done proactively rather than reactively
Solution Approach 2:
The patent introduces an intermediary reliability evaluation mechanism between the home network and the visited network component. This intermediary layer assesses the trustworthiness of the visited network component using multiple criteria (encryption capability, anomalous traffic detection, velocity checks) before allowing message routing, thus maintaining security while enabling message delivery through roaming networks
2Measurement precision
If reliability evaluation criteria are expanded to include multiple parameters, then security detection capability is improved, but system complexity increases
Solution Approach 1:
The reliability evaluation system is segmented into multiple independent criteria modules: encryption capability assessment, anomalous traffic pattern detection, velocity check, and previous communication success evaluation. Each module independently assesses a specific aspect of reliability, making the complex evaluation process manageable and maintainable while achieving comprehensive security detection
Solution Approach 2:
The reliability metric evaluation system serves multiple functions simultaneously: it assesses encryption capability, detects anomalous traffic patterns, performs velocity checks, and evaluates previous communication success. This multi-functional approach consolidates what would otherwise be separate security mechanisms into a single unified evaluation framework, reducing overall system complexity while maintaining comprehensive security detection
Data Source
AI summary
A computer implemented method of selective transmission of a communications message from a home telecommunications network to a visited telecommunications network for delivery to a subscriber device roaming via the visited network includes receiving the message at the home network; identifying a communications component of the visited network to which the messages is to be routed; evaluating a reliability metric for the communications component; and forwarding the message to the communications component of the visited network for delivery to the subscriber device in dependence on the evaluated reliability metric.