SS7 Interface Security via Message Filtering and Address Verification

The patent introduces an intermediary security system positioned between external SS7 networks and the mobile network core. This intermediary analyzes incoming SS7/MAP messages, verifies address legitimacy, checks for attack patterns, and filters malicious traffic before it reaches vulnerable network elements like HLR and VLR. This mediator approach allows the system to maintain SS7 protocol functionality while adding a protective layer that blocks fraud and attacks.

The patent implements preliminary security checks on incoming SS7/MAP messages before they are processed by the mobile network. The system pre-validates sender addresses against known mobile network prefixes, pre-identifies potential attack patterns such as bulk location requests or authentication bypass attempts, and pre-rejects suspicious messages. This preliminary action prevents malicious traffic from consuming network resources or compromising security.

The patent applies partial verification by focusing security checks on the most critical aspects of SS7/MAP messages. Rather than validating every single parameter, the system performs targeted checks on key fields such as sender address format, message type legitimacy, and obvious attack patterns. This selective approach provides sufficient security protection while minimizing processing overhead and maintaining fast message handling for legitimate traffic.

The patent uses lightweight, disposable security validation rules that can be quickly created, deployed, and discarded. Security filters are implemented as simple pattern-matching rules and address validation lists that require minimal computational resources. These validation mechanisms can be rapidly updated to counter new attack vectors without requiring complex, long-lived security infrastructure, thus reducing processing time while maintaining security.