Cell Broadcast via Encrypted Message to Embedded Client
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional GSM systems lack the ability to authenticate and limit which clients receive broadcast messages, preventing providers from determining listener demographics and message recipients.
Innovation Solution
A system that encrypts broadcast messages and provides mobile stations with client applications to retrieve cryptographic keys associated with subscribed services, allowing only authorized devices to decrypt and display the messages, with the option for keys to expire at predetermined times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If broadcast messages are transmitted to all clients in a geographic area, then message delivery coverage is improved, but message security and authorization control deteriorate
Solution Approach 1:
The patent segments the broadcast message delivery by dividing the audience into authorized and unauthorized segments. Each client device is assigned a unique cryptographic key that segments the message decryption capability, allowing only authorized devices to access the message content while maintaining broad broadcast coverage.
Solution Approach 2:
The patent introduces a cryptographic key as an intermediary between the broadcast message and the client device. This intermediary element mediates the access control, allowing the message to be transmitted broadly while ensuring only authorized devices can decrypt and access the content.
2Device complexity
If conventional broadcast messages are transmitted to all clients, then system complexity is reduced, but authorization control capability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-distributing cryptographic keys to client devices before message transmission. The network stores authorized device identifiers and corresponding keys in advance, enabling automatic authorization verification during broadcast without requiring complex real-time authentication protocols.
Solution Approach 2:
The patent changes the parameter of message transmission from unencrypted to encrypted form. This parameter change enables authorization control while maintaining broadcast simplicity, as the encryption/decryption operation is handled transparently at the device level without affecting the broadcast mechanism itself.
3Reliability
If cryptographic keys are provided to mobile stations, then message security is improved, but device complexity deteriorates
Solution Approach 1:
The patent implements self-service by enabling mobile stations to automatically retrieve and manage their own cryptographic keys through the network. The device autonomously performs key retrieval, storage, and usage for message decryption without requiring manual intervention or complex key management operations.
Solution Approach 2:
The patent uses the network as an intermediary to manage cryptographic key distribution. Rather than requiring complex local key management systems, the network serves as a centralized intermediary that provides keys to authorized devices, simplifying the overall system architecture.
Data Source
AI summary
A system for authorizing information services that are provided via broadcast messages to mobile stations. The broadcast messages are encrypted prior to being communicated to devices within a geographic area. The mobile stations are provided with a client application that retrieves cryptographic keys associated with the information services to which a customer is subscribed. When the mobile station receives encrypted broadcast messages, the client application determines if it has the cryptographic key to decrypt the message. If so, the information contained in the message is displayed. If not, then the message is ignored by the mobile station.