SSL Decoding Device Intercepts Encrypted Packets
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Solution Overview
Problem
Existing security measures struggle to inspect SSL-encrypted packets without blocking external SSL communication, which can decrease work efficiency and hinder data security.
Innovation Solution
An SSL decoding method that intercepts and decodes SSL packets between a client and a server, converting them into TCP packets for inspection by a security device, while maintaining communication with the server through re-encoding, using an SSL decoding device that verifies packet origin based on TTL values in IP headers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SSL communication is blocked to maintain security, then data security is improved, but work efficiency deteriorates
Solution Approach 1:
The patent introduces an SSL decoding device as an intermediary component positioned between the client and security device. This mediator intercepts SSL packets, decodes them into readable format, and forwards the decoded packets to the security device for inspection. The intermediary enables security inspection of encrypted traffic without blocking the communication, thus maintaining both security and work efficiency.
Solution Approach 2:
The patent segments the SSL communication process into distinct phases: packet interception at the SSL decoding device, decoding of SSL packets into readable format, and separate inspection by the security device. This segmentation allows the security inspection function to be isolated from the communication function, enabling both to operate simultaneously without interfering with each other.
2Difficulty of detecting and measuring
If SSL packets are inspected directly, then security inspection capability is improved, but device complexity increases
Solution Approach 1:
The SSL decoding device serves as a specialized intermediary that handles the complex task of SSL packet decoding. By separating this decoding function into a dedicated device, the main security inspection device doesn't need to incorporate complex SSL decoding capabilities, thus reducing overall system complexity while maintaining inspection capability.
Solution Approach 2:
The patent creates a virtual copy of the SSL communication stream through the SSL decoding device. The device intercepts SSL packets and generates decoded versions that replicate the original communication in readable format. This copying approach allows security inspection without requiring the inspection device to process encrypted data directly, simplifying the inspection device's architecture.
Data Source
AI summary
Decoding includes sensing a packet related to SSL handshake for connecting a SSL between a client and a server after a TCP session has been established between the client and the server in an SSL decoding device. If the packet for an SSL handshake is transmitted in a preset operating system, an SSL between the client and the SSL decoding device and an SSL between the SSL decoding device and the server is established. A TCP session between a virtual client corresponding to the client and a virtual server corresponding to the server is also established. A packet transmitted/received between the virtual client and the virtual server is transmitted when the TCP session is established. If a first SSL packet transferred from the client to the SSL decoding device is received, the SSL packet is decoded and transmitted to the security device and to the server.