Private Gateway Message Archival via Grey List and Blockchain
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Solution Overview
Problem
Telecommunications service providers face challenges in complying with legal requests for communication data under CALEA, as IP transport elements like private gateways lack built-in intercept features, making real-time surveillance and data storage difficult due to manipulation techniques such as port changes and encryption.
Innovation Solution
A message archival and retrieval system that uses a 'grey list' to identify relevant data messages via private gateways, storing them in block chains for immutability and compliance, even when ports and protocols are changed or encrypted, and also accommodates voice messages for a robust database.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If private gateways are used to couple UE to radio access network, then device complexity is reduced and ease of operation is improved, but the ability to perform real-time surveillance and intercept communications is lost
Solution Approach 1:
A CALEA intercept server is introduced as an intermediary component within the private gateway system. This server acts as a mediator between the radio access network and law enforcement agencies, enabling surveillance capabilities to be maintained within the private gateway architecture without requiring modifications to the core gateway functionality. The intercept server captures communications locally and forwards them to authorized entities.
Solution Approach 2:
The private gateway system is segmented into distinct functional components: the core gateway infrastructure that handles general traffic routing, and a separate CALEA intercept server that handles surveillance operations. This segmentation allows the gateway to maintain its simplified operation while the intercept server provides the necessary surveillance functionality independently.
2Reliability
If traditional intercept methods are used in IP transport elements, then surveillance capability is maintained, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The CALEA intercept server is designed with multi-functionality, serving both as a surveillance intercept point and as a communication relay between law enforcement agencies and the radio access network. This universal design consolidates multiple functions into a single component, reducing overall system complexity while maintaining surveillance capabilities.
3Reliability
If message data is stored in block chains, then data integrity and immutability are improved, but storage time and processing speed are reduced
Solution Approach 1:
Messages are pre-processed and filtered at the private gateway level before being stored in the blockchain. The CALEA intercept server identifies and extracts only the relevant communications that require archival, preparing them in advance for blockchain storage. This preliminary action reduces the volume of data requiring blockchain processing and storage time.
Solution Approach 2:
Only the essential message data and metadata required for legal compliance are extracted and stored in the blockchain, while other processing and analysis operations are performed separately. This extraction approach minimizes the data volume in the blockchain, reducing storage time and improving retrieval efficiency while maintaining data integrity for the essential information.
Data Source
AI summary
A message archival and retrieval system is disclosed comprising a telecommunications service provider server that receives a request for messages associated with a party from a government agency server and transmits a grey list to one or more private gateways. The system also comprises a private gateway configured to couple a plurality of user equipment (UE) to a radio access network that receives the grey list from the telecommunications service provider server, identifies data messages associated with the party from one or more of the plurality of UE based on identifying information included in the grey list, continues transmission of the identified data messages to one or more intended endpoints, and stores the identified data messages and corresponding metadata in one or more block chains in a message data store. The one or more block chains are transmitted to the government agency server in response to the request for messages.