Packet Security Gateway Filtering for Network Exfiltration Control
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Solution Overview
Problem
Conventional cyber defense systems struggle to prevent exfiltrations and other cyber attacks due to vulnerabilities in network protocols, misinterpretation by trust models, human engagement in vulnerable activities, and the inability to scale with network traffic volumes and performance requirements, making it difficult to distinguish malicious data transfers from normal behavior.
Innovation Solution
Implementing a packet security gateway (PSG) that applies dynamic security policies to filter network data transfers by examining packet header and application-level header information, using operators to allow or block packets based on predefined rules, specifically targeting HTTP methods and TLS versions to prevent exfiltration and enforce network usage policies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional packet filtering is used to block cyber attacks, then network security is improved, but the system cannot distinguish malicious data transfers from normal behavior
Solution Approach 1:
The patent implements dynamic security policies that can be updated in real-time based on threat intelligence and network conditions. The packet security gateway dynamically adjusts filtering rules to adapt to evolving threats while maintaining normal traffic flow, resolving the contradiction between security reliability and the difficulty of detecting malicious transfers.
Solution Approach 2:
The system changes multiple parameters simultaneously including packet header fields, application-level headers, and policy rules to identify and block malicious traffic. By monitoring multiple parameters (source/destination IPs, ports, protocols, HTTP methods, TLS versions), the system can distinguish exfiltration attempts from normal transfers, improving reliability without increasing detection difficulty.
2Reliability
If network filtering rules are applied to prevent exfiltration, then security is improved, but network performance and throughput are degraded
Solution Approach 1:
The patent segments the filtering process into multiple stages: initial packet header filtering, application-level header analysis, and policy-based decision making. This segmentation allows the system to quickly filter out obviously malicious traffic while applying more intensive analysis only to suspicious packets, maintaining high throughput while preventing exfiltration.
Solution Approach 2:
The system applies partial action by selectively applying deep inspection only to packets that match specific criteria (e.g., unusual HTTP methods, unexpected TLS versions). Normal traffic receives minimal processing, preserving network performance, while suspicious traffic undergoes comprehensive analysis to prevent exfiltration.
3Difficulty of detecting and measuring
If dynamic security policies with multiple operators are implemented, then exfiltration detection capability is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal packet security gateway architecture that handles multiple security functions through a single integrated system. The gateway can apply various operators (allow, block, redirect, log) based on unified policy rules that cover multiple threat types, reducing overall device complexity while maintaining advanced exfiltration detection capabilities.
Solution Approach 2:
The system introduces policy rules as intermediaries between the complex security requirements and the actual packet filtering operations. These rules act as a manageable layer that translates security policies into actionable filtering decisions, reducing the complexity of implementing and maintaining multiple security operators.
4Ease of operation
If conventional trust models are used to interpret network operations, then ease of operation is maintained, but exfiltrations are misinterpreted as trusted operations
Solution Approach 1:
The patent implements preliminary action by establishing security policies and rules before network operations occur. The system pre-configures filtering criteria and operators that automatically evaluate packets against known exfiltration patterns, ensuring that exfiltrations are identified and blocked before they can be misinterpreted as trusted operations by conventional trust models.
Data Source
AI summary
Aspects of this disclosure relate to filtering network data transfers. In some variations, multiple packets may be received. A determination may be made that a portion of the packets have packet header field values corresponding to a packet filtering rule. Responsive to such a determination, an operator specified by the packet filtering rule may be applied to the portion of packets having the packet header field values corresponding to the packet filtering rule. A further determination may be made that one or more of the portion of the packets have one or more application header field values corresponding to one or more application header field criteria specified by the operator. Responsive to such a determination, at least one packet transformation function specified by the operator may be applied to the one or more of the portion of the packets.