What does NetSenX read from an encrypted connection?

Flow metadata (who connects to whom, when, how often and how much data moves) and a few protocol fields: the server name and the parameters in the TLSTLS: Transport Layer Security. The encryption that protects most internet traffic, such as HTTPS. handshake, and the answers to DNS queries. NetSenX never decrypts the session and does not read its encrypted content.

This answer also appears, with more context, here: Encrypted traffic analysis

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