API Hooks for Encrypted Traffic Filtering
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Solution Overview
Problem
Existing filtering technologies are ineffective for encrypted communication traffic, such as HTTPS, as they cannot inspect encrypted data without cracking the encryption, compromising security and requiring trust in intermediaries, which is not acceptable for secure communications.
Innovation Solution
Injecting application programming interface (API) hooks into client applications to divert data for filtering and modification before encryption and after decryption, allowing content filtering without exposing plain text, thus maintaining privacy and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encrypted communication is used to protect security and privacy, then security and privacy are improved, but filtering capability deteriorates because filters cannot inspect encrypted data
Solution Approach 1:
The patent performs filtering operations on the plaintext data before it is encrypted and transmitted. By intercepting the data at the application layer before encryption occurs, the system can apply filtering rules to the readable plaintext, then allow the filtered data to proceed through the encryption process. This preliminary action resolves the contradiction by enabling filtering capability without compromising the security of the encrypted transmission.
Solution Approach 2:
The patent introduces an intermediary component (the hook mechanism) that sits between the application layer and the encryption process. This intermediary captures plaintext data before encryption, applies filtering rules, and then allows the processed data to continue to the encryption stage. The intermediary enables filtering capability while maintaining the integrity and security of the encrypted communication channel.
2Difficulty of detecting and measuring
If proxy-in-the-middle method is used to filter encrypted traffic, then filtering capability is improved, but security deteriorates because the proxy must crack encryption and re-encrypt data
Solution Approach 1:
Instead of cracking encryption after it occurs (as proxy-in-the-middle does), the patent performs filtering action before encryption takes place. The hook mechanism intercepts plaintext data at the application layer, applies filtering rules, and then allows the already-filtered data to proceed through the normal encryption process. This eliminates the need to crack or re-encrypt data, maintaining security while enabling filtering.
Solution Approach 2:
The patent extracts the filtering operation from the encrypted communication path and places it in the plaintext domain before encryption. By separating the filtering function from the encryption/decryption process, the system avoids the security vulnerabilities inherent in proxy-in-the-middle approaches while maintaining filtering capability.
3Difficulty of detecting and measuring
If proxy-in-the-middle method is used to inspect encrypted communications, then filtering capability is improved, but trust requirements worsen because clients must trust the proxy with their credentials and data
Solution Approach 1:
The patent performs filtering at the application layer before data leaves the client device, eliminating the need for external proxy trust. Since filtering occurs locally before encryption, the client only needs to trust its own filtering mechanism, not an external proxy service. This dramatically reduces trust requirements while maintaining filtering capability.
Solution Approach 2:
The patent implements self-service filtering where the client device performs its own filtering operations through injected hooks. Rather than relying on an external proxy to filter traffic, the system enables the client to autonomously filter its own outbound plaintext data before encryption and inbound decrypted data after reception. This self-service approach eliminates the need for clients to trust external proxies with their credentials and sensitive information.
Data Source
AI summary
Application programming interface (API) hooks are injected into an application program executing at a client during run-time. Responsive to these hooks, data intended for encryption prior to transmission from the client is diverted, for example for content filtering, compression, etc., prior to being encrypted. In the case of encrypted data received at the client, the data is decrypted but before being passed to the application it is diverted, under control of the API hooks, for content filtering, decompression, etc.