+This paper puts forward a feasible, non-intrusive, method of tracking user activity using TLS’s Client Hello section of a handshake (specified in the TLS protocol), namely the `server_name` extension. This method can provide an attacker with relevant information regarding patterns and services utilized inside of the target network, further expanding their understanding of the attack surface, potentially, serving as a tool to determine the timing of an attack or, even, provide an attacker with knowledge of a point of entry to a given system. It is noteworthy that TLS Client Hellos will be encrypted in a future version of the TLS protocol, rendering this method infeasible in fully updated networks.
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