Secure Messaging Framework for SIM Swap OTP Blocking
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Solution Overview
Problem
Existing methods to prevent SIM swap fraud place a significant burden on individual users and are often ineffective once a SIM change has been initiated, allowing fraudsters to access accounts quickly and steal sensitive information.
Innovation Solution
A network-based messaging framework that includes setting a flag upon detection of a SIM change, temporarily blocking delivery of one-time passwords (OTPs) to new SIMs, using AI models to analyze text messages, and setting a time-limited flag to prevent unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mobile number portability is enabled to allow seamless phone number transfer, then customer service flexibility and ease of operation are improved, but vulnerability to SIM swap fraud increases
Solution Approach 1:
The system performs preliminary actions by detecting SIM change events and setting protective flags before fraud can occur. When a SIM change is detected, the system proactively blocks OTP messages from being delivered to the new SIM, preventing potential account takeover before it happens.
Solution Approach 2:
The patent introduces an intermediary security layer between the messaging system and the end user. The framework intercepts OTP messages at the network level, analyzes them using AI models, and determines whether to deliver them based on SIM change detection, acting as a mediator that protects users without requiring their direct involvement.
2Speed
If OTP messages are delivered to new SIMs immediately after SIM change, then message delivery speed is improved, but account security is compromised
Solution Approach 1:
The system performs preliminary security checks by detecting SIM changes and setting protective flags before OTP messages are delivered. This preliminary action prevents fraudulent message delivery while allowing legitimate messages to pass through once the protective period expires or is cleared.
Solution Approach 2:
The message delivery system dynamically adjusts its behavior based on the SIM change status. When a SIM change is detected, the system temporarily blocks OTP delivery; when no SIM change is detected or the protective period expires, normal delivery resumes. This dynamic adjustment balances security and delivery speed.
3Measurement precision
If AI models are used to analyze text messages for fraud detection, then fraud detection accuracy is improved, but system complexity and processing time increase
Solution Approach 1:
The system applies partial analysis by focusing AI model analysis specifically on OTP messages rather than all messages. The framework identifies messages containing OTP patterns and applies sophisticated AI analysis only to those, while other messages are handled by simpler rules, reducing overall system complexity while maintaining high detection accuracy for critical messages.
Data Source
AI summary
A telecommunications system is configured to prevent Subscriber Identity Module (SIM) swap scams. The system includes multiple network nodes and a database. When a SIM change occurs for a given phone number, a messaging process is triggered between the network nodes that temporarily sets a flag in the database associated with that phone number. While the flag is set in the database, messages for the phone number are not delivered in a normal manner. Instead, the messages are analyzed by the network for the presence of secure information, such as one-time passwords (OTPs). If a message is determined to be secure by the network, then delivery of the message is blocked, thereby preventing a fraudster from performing SIM swap fraud using the message.