Encryption is now the default, and that is mostly good — except it blinds the network defender. Traditional inspection means breaking the encryption in the middle (a man-in-the-middle proxy), which is expensive, brittle, and increasingly defeated by certificate pinning. The defender needs visibility without holding the keys.
Cisco Technology, Inc.'s US11310246B2, “Endpoint-assisted inspection of encrypted network traffic” (issued April 19, 2022; CPC H04L 63/1416 — network intrusion detection, and H04L 63/0428 — encrypted data transmission), describes inspecting encrypted traffic with the endpoint's assistance rather than by full mid-stream decryption. Read it at US11310246B2.
Mechanically, the endpoint — which sees the traffic before encryption or has context the network lacks — supplies signals that let the network analysis reason about the encrypted flow without decrypting it. Cisco built related work on encrypted-traffic analytics that infers maliciousness from metadata and behavior; this endpoint-assisted variant adds the device's own perspective. Cisco filed continuation grants on this exact title in 2024, underscoring how much it invested in the approach.
Why this is a business story: encrypted-traffic visibility is a core selling point for Cisco's security portfolio and a genuine differentiator against decrypt-everything architectures that customers increasingly reject on cost and privacy grounds. Combined with the $28 billion Splunk acquisition, this is part of how Cisco positions security as a platform spanning network and endpoint — inspection that works without the decryption tax is a competitive wedge.
The grounded read: endpoint-assisted inspection restores visibility into encrypted traffic without the cost and fragility of decrypting it. Cisco's 2022 grant names that approach — a differentiator in a world where breaking encryption mid-stream is increasingly untenable.