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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/hybrid-key-exchange-deployment-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Post-Quantum CryptographyHybrid Key Exchange Deployment Patents: Filing Trends and Leading Assignees
- Concentrated at the top. The top 5 assignees hold 60.7% of all 140 records in scope, and the top 10 hold 98.6% — almost nothing sits outside a small group of filers.
- Filing has cooled from its 2019 peak. Volume peaked at 20 records in 2019, and the last complete three-year span shows -13% from 2021 (8) to 2024 (7).
- Transport-layer framing dominates the claim space. H04L covers 83.6% of records and H04W 40.7%, while device-processing and edge classes like G07C and A61B stay in single digits.
140
Published Records
61%
Top-5 Share of All Records
-13%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (8 records) with 2024 (7) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 140 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
Hybrid key exchange deployment sits at the intersection of key encapsulation mechanisms, cipher suite negotiation and the practical handshake mechanics — message size, fragmentation, downgrade protection, latency and session resumption — that determine whether a post-quantum scheme actually ships in a working protocol stack. This dataset tracks 140 published records filed or published between 2015 and mid-2026 that combine a key-establishment concept with one of these deployment-level constraints.
Because publication lags filing by roughly 18 months, the 2025 and 2026 figures in any trend understate real filing activity; treat the last complete year, 2024, as the most recent reliable data point.
Filing activity and technology composition, 2015-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Hybrid Key Exchange Deployment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
The data
Filing trend and technology composition
Two views of the same 140 records: how filing volume has moved year over year, and which IPC subclasses carry the claim weight.
Filing trend, 2017-2026
Filings rose from 2 in 2017 to a peak of 20 in 2019, then eased; the last complete comparison shows 2021 at 8 records against 2024 at 7, a -13% change. 2025 and 2026 are still filling in under the publication lag and should not be read as a decline.
IPC subclass composition
H04L (digital information transmission) appears in 83.6% of the 140 records and H04W (wireless networks) in 40.7%, confirming that most activity is framed as transport or network-layer protocol work rather than device or application claims. G06F, G07C, A61B, H04Q, G01S and G06T each cover a minority of records, marking narrower device- or sensor-adjacent filings. Records can carry more than one class, so these shares sum past 100%.
Shares are the percentage of the 140 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Hybrid Key Exchange Deployment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Representative and most-cited records
Representative record
Secure Session Resumption using Post-Quantum Cryptography (US20230308424A1)
ADEIA EMERGING TECHNOLOGIES INC.
A server and a device can support secure sessions with both post-quantum key encapsulation mechanisms and session resumption. In an initial secure session, the device and server mutually generate a first shared secret key from a first KEM based on a device key pair, and a second shared secret key from a second KEM based on a server key pair. A symmetric ciphering key is derived from both, the server encrypts a pre-shared-key identity with it, and the device and server mutually generate a PSK from both shared secrets to close out session establishment.Filed by Adeia Emerging Technologies, published 2023-09-28.
Most-cited records in scope
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20050163078A1 | Mobility architecture using pre-authentication, pre-configuration and/or virtual soft-handoff | 300 |
| 2 | US7046647B2 | Mobility architecture using pre-authentication, pre-configuration and/or virtual soft-handoff | 210 |
| 3 | US20040098588A1 | Interlayer fast authentication or re-authentication for network communication | 108 |
| 4 | US20150341791A1 | Electronic subscriber identity module provisioning | 55 |
| 5 | US7587598B2 | Interlayer fast authentication or re-authentication for network communication | 40 |
| 6 | US7215773B1 | Key validation scheme | 40 |
| 7 | US20170093565A1 | Pre-personalization of electronic subscriber identity modules | 37 |
| 8 | US20070171870A1 | Mobility architecture using pre-authentication, pre-configuration and/or virtual soft-handoff | 37 |
| 9 | US20010014153A1 | Key validation scheme | 37 |
| 10 | US20230308424A1 | Secure Session Resumption using Post-Quantum Cryptography | 32 |
Citation counts favour older records simply because they have had longer to be cited; read them as a signal of influence within this corpus, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Hybrid Key Exchange Deployment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for a filing decision
Read together, the concentration, trend and classification figures point to a field where claim space is already dense at the protocol layer but thin at the edges.
Concentration
60.7% / 98.6%
share of 140 records held by top 5 / top 10 assignees
A small group holds nearly all of the field
With the top 5 assignees accounting for 60.7% of all 140 records and the top 10 for 98.6%, this is not a fragmented emerging area — it is a field where a handful of established communications and device makers have already staked out the core claim territory. New entrants filing broad handshake or KEM claims will land in dense prior art.
Based on the 44-company assignee ranking.
Momentum
-13%
change from 2021 (8) to 2024 (7)
Volume has eased from its 2019 peak, not accelerated
Filing peaked at 20 records in 2019 and has since settled to a lower, steadier pace, with 2021 to 2024 showing a -13% change. That is consolidation around established approaches rather than an open land grab, though 2025-2026 figures are still incomplete under the publication lag.
2024 is the most recent complete year.
Classification
83.6% H04L
of 140 records carry an H04L class
Transport-layer framing crowds out device-level claims
H04L and H04W together dominate the classification picture, while G07C, A61B, G01S and G06T each sit under 5% of records. That gap suggests device-integration and sensor-adjacent applications of hybrid key exchange are far less claimed than the core protocol mechanics.
Classes overlap; shares sum past 100% of the 140 records.
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Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hybrid key exchange deployment, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Hybrid Key Exchange Deployment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is filing, and where the gaps sit
The ranked leaders span device makers, network equipment vendors and a few specialist cryptography firms; recent-year filing has slowed across the group as a whole.
Leader
19 records
records held by the top-ranked assignee
One filer sits well ahead of the field
The leading assignee holds 19 records against a fifth-place figure of 14 and a tenth-place figure of 7, showing a steep drop-off rather than a gradual one. That gap matters for freedom-to-operate work: the leader's claim set is the first one to clear.
Ranking covers 44 companies total.
Co-filing
10 pairs
co-assignee pairs identified
Collaboration is limited and concentrated
Only 10 co-assignee pairs appear across the dataset, with the strongest pairing linking a specialist research firm to a major device maker. Most records are single-assignee, meaning cross-licensing or joint-development signals are the exception here, not the norm.
Strongest pair recurs across multiple records.
Momentum
0 in latest year
records from several leading assignees in the most recent year
Recent-year activity has gone quiet across the top filers
Several of the assignees with the largest historical portfolios show zero records in the latest year, consistent with the field's overall cooling since 2019 rather than any single company's retreat. Read this alongside the publication lag: recent filings from these same firms may simply not have published yet.
Momentum reflects publication timing, not necessarily filing intent.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Apple Inc. | 0 | — |
| NYMI | 0 | — |
| Certicom Corp. | 0 | — |
| Koninklijke Philips N.V. | 0 | — |
| Motorola Solutions, Inc. | 0 | — |
| Telcordia Technologies, Inc. | 0 | — |
| Telefonaktiebolaget LM Ericsson (publ) | 0 | — |
| TOSHIBA AMERICA RESEARCH INC | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Hybrid Key Exchange Deployment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's next
Where to take this next
The landscape points to a dense core and a thin edge; the next step depends on whether you are clearing a filing or scouting a gap.
Run a freedom-to-operate check against the leader's portfolio
With one assignee holding 19 records and a steep drop to the rest of the field, any new hybrid key exchange filing should first be checked against that portfolio's specific claim scope.
Explore assignee portfolios in EurekaMap the under-claimed branches before drafting
Device-integration and sensor-adjacent classes remain thin relative to H04L and H04W; a claim drafted toward one of those branches has more room to establish a distinct position.
Search white space in EurekaTrack publication-lag-adjusted filing activity
2025-2026 figures will keep rising as filings publish; re-running this view in a few quarters will give a more accurate read on whether the 2021-2024 cooling continued.
Set up a monitoring alert in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Hybrid Key Exchange Deployment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Frequently asked questions
This landscape covers published records that combine a key-establishment concept — key encapsulation mechanisms, key agreement protocols or cipher suite negotiation — with a deployment-level constraint such as handshake message size, packet fragmentation, downgrade protection, handshake latency, session resumption or shared secret derivation. The search deliberately pairs the cryptographic primitive with the practical mechanics of shipping it in a protocol, since many filings claim the primitive alone without addressing deployment. There are 140 such records in scope, published between 2015 and mid-2026.
The assignee ranking covers 44 companies, with the leader holding 19 records against a fifth-place figure of 14 and a tenth-place figure of 7. The top 5 assignees together account for 60.7% of all 140 records, and the top 10 account for 98.6%, meaning nearly all activity sits within a small group of network equipment vendors, device makers and specialist cryptography firms. This is a concentrated field rather than a fragmented one, so a competitive review should prioritise the leading names before scanning the long tail.
Filing volume peaked at 20 records in 2019 and has since eased, with the most recent complete comparison — 2021 at 8 records versus 2024 at 7 — showing a -13% change. Figures for 2025 and 2026 are still incomplete because publication typically lags filing by around 18 months, so they should not be read as evidence of continued decline. The honest read is that the field has settled into a steadier, lower-volume pace after its 2019 peak rather than that it is shrinking.
H04L, digital information transmission, appears in 83.6% of the 140 records and H04W, wireless communication networks, in 40.7%, confirming that most claim activity sits at the transport and network protocol layer. Narrower classes — G07C, A61B, H04Q, G01S and G06T — each cover under 5% of records, pointing to comparatively light claiming around device authentication, medical, switching, positioning and image-processing applications of hybrid key exchange. Because a single record can carry multiple classes, these shares add up to more than 100% of the record total and should not be summed.
The clearest gaps sit in the classes with low record shares relative to the H04L/H04W core: device-integration scenarios (G07C, A61B), positioning-adjacent key derivation (G01S) and image-data applications (G06T) are all under 5% of the 140 records despite the underlying key-exchange mechanics being well established. Co-filing is also limited, with only 10 co-assignee pairs identified across the dataset, suggesting joint-development claim structures are underused. A first claim in one of these thinner branches has more room to establish distinct scope than another filing on core handshake or KEM mechanics.
Answers are grounded in the same dataset. Derived from a Patsnap search on Hybrid Key Exchange Deployment covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company's registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.