Automatic SSL Bypass Through Failed-Handshake Fingerprint Caching
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Solution Overview
Problem
Conventional network appliances struggle to scale with encrypted traffic, leading to resource intensity and increased risk of data loss due to the concealment of malware and sensitive data within SSL/TLS traffic, which is difficult and expensive to inspect, resulting in reduced visibility and control.
Innovation Solution
A cloud-based system that detects failed client SSL connections, creates a cache entry with a traffic fingerprint, and bypasses subsequent connections matching the cached fingerprint, using a Time-To-Live (TTL) mechanism and enabling SSL inspection bypass rules with customizable error codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional appliances are used to inspect encrypted SSL traffic, then security inspection capability is provided, but resource intensity increases and scalability deteriorates
Solution Approach 1:
The patent extracts the SSL inspection function from conventional network perimeter appliances and relocates it to a cloud-based enforcement node. This extraction allows the cloud system to handle SSL decryption and inspection centrally, freeing up local appliances from resource-intensive encryption breaking operations while maintaining security inspection capabilities.
Solution Approach 2:
The patent introduces a cloud-based enforcement node as an intermediary between clients and destination servers. This intermediary performs SSL decryption and inspection centrally, acting as a mediator that handles the resource-intensive encryption breaking operations in the cloud rather than at the network perimeter appliances, thereby improving scalability.
2Loss of information
If SSL traffic inspection is performed to detect malware and sensitive data, then security visibility is improved, but processing cost and latency increase
Solution Approach 1:
The patent implements a caching mechanism that stores fingerprints of previously inspected SSL connections. When a new connection request arrives, the system performs preliminary checking against the cache before initiating full SSL inspection. This preliminary action reduces redundant decryption and inspection operations, thereby reducing processing latency while maintaining security visibility.
Solution Approach 2:
The patent applies different inspection strategies based on connection characteristics. By fingerprinting and categorizing SSL connections, the system applies full inspection only when necessary (when cache misses or new connection types are detected) and bypasses inspection for repeated, known-safe connections. This local quality approach optimizes the balance between security visibility and processing latency.
3Productivity
If cloud-based SSL inspection is implemented, then scalability is improved, but system complexity increases
Solution Approach 1:
The patent creates a universal cloud-based enforcement node that handles multiple functions: SSL certificate validation, decryption, traffic inspection, fingerprinting, and caching. This multi-functional cloud system replaces multiple specialized appliances, simplifying the overall architecture while improving scalability. The cloud system serves as a universal endpoint for all SSL inspection needs.
Solution Approach 2:
The patent uses fingerprinting to create simplified representations (copies) of SSL connections instead of maintaining full connection states. By storing only essential fingerprint data in the cache rather than complete session information, the system reduces memory requirements and simplifies the caching mechanism while maintaining the ability to recognize and bypass repeated connections efficiently.
Data Source
AI summary
The present disclosure relates to systems and methods for automatically bypassing SSL connections responsive to client SSL handshake failures. Various embodiments include detecting a first failed client SSL connection, creating a cache entry including a traffic fingerprint of the first failed client SSL connection, and bypassing subsequent connections matching the cached fingerprint of the first failed client SSL connection. Embodiments further include cache entries that include a TTL, wherein connections can be matched to the entries during the configured TTL. The present systems and methods are provided to alleviate issues associated SSL traffic interruptions and breakdowns.