Encryption Implementation Patents: Who Leads, Where the Gaps Are 2026
- 1,804 families tracked, with filings peaking in 2025 at 168 after a flat-to-declining run from a 2022 midpoint of 109 — the field is well past its filing-growth phase.
- China and the US dominate filing venues, with 705 and 479 records respectively, more than four times the next-largest office, Europe at 172.
- No assignee shows year-over-year growth, the leading holders — including Huawei Technologies Co., Ltd. and International Business Machines Corporation (IBM) — all register zero filings in the latest tracked year.
Filing growth compares 2021 (96 records) with 2024 (143) — 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 1,804 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset isolates patent families at the intersection of encryption algorithm implementation — AES, RSA and related primitives — and the operational mechanics practitioners actually litigate and design around: key management, block cipher mode selection, key length, performance overhead, and digital signature schemes. The IPC scope spans H04L9 (cryptographic mechanisms), G06F21 (security arrangements) and G06F7 (arithmetic processing), which keeps the corpus centred on implementation rather than pure protocol theory.
Filing activity runs from 2015 through the middle of 2026, with the final year necessarily undercounted because publication typically lags filing by around 18 months. Treat the most recent one to two years of any trend line as a floor, not a ceiling.
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Filing trends and technology composition
Two views of the same 1,804 families: how filing volume has moved over time, and which IPC subclasses carry the claim density.
A filing curve that has already crested
Annual filings rose from 62 in 2017 to a peak of 168 in 2025, passing through 109 at the 2022 midpoint. The declining 2026 figure reflects the publication lag rather than a genuine drop-off, but the shape from 2022 to 2025 shows the growth phase has already happened — new entrants now face a filed-up field rather than an open one.
Concentration in digital transmission and data processing
H04L (digital information transmission) accounts for 1,551 of the records and G06F (electric digital data processing) for 697 — together far outweighing wireless (H04W, 116), dedicated ciphering (G09C, 112) and video/broadcast classes. That skew confirms most claims sit on transmission-layer and general-purpose implementation, not on domain-specific hardware or AI-assisted cryptography, which remain comparatively thin at 52 records under G06N.
Shares are the percentage of the 1,804 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Symmetric and Asymmetric Encryption Implementation with Eureka
This page is one run against one query. Ask Eureka your own question about symmetric and asymmetric encryption implementation and every answer comes back with the patent numbers behind it.
Try EurekaThe records other filings cite most
Cryptographic communication method, encryption algorithm shared control method, encryption algorithm conversion method and network communication system
An operating encryption algorithm is converted to another encryption algorithm. When different encryption algorithms are operated by a personal computer 100 for use by a group A and a personal computer 200 for use by group B, an encryption algorithm operated by the personal computer 100 is encrypted by the personal computer 100 with the encryption algorithm operated by the personal computer 200 and transmitted to the personal computer 200.Filed by Hitachi, Ltd. — a mid-2000s approach to cross-group algorithm negotiation that anticipates today's crypto-agility requirements.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5870474A | Method and apparatus for providing conditional access in connection-oriented, interactive networks with a mul… | 828 |
| 2 | US5757919A | Cryptographically protected paging subsystem | 509 |
| 3 | US5142578A | Hybrid public key algorithm/data encryption algorithm key distribution method based on control vectors | 313 |
| 4 | US20020162104A1 | Encrypted media key management | 290 |
| 5 | US20080022089A1 | Security system for handheld wireless devices using-time variable encryption keys | 285 |
| 6 | US20040091114A1 | Encrypting operating system | 274 |
| 7 | US6490353B1 | Data encrypting and decrypting apparatus and method | 256 |
| 8 | US20040179684A1 | Identity-based-encryption messaging system | 246 |
| 9 | US20110252243A1 | System and method for content protection based on a combination of a user pin and a device specific identifier | 219 |
| 10 | US5949882A | Method and apparatus for allowing access to secured computer resources by utilzing a password and an external… | 219 |
Citation counts favour older filings simply because they have had longer to accumulate references — read this as a map of foundational influence, not of current commercial relevance.
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Browse MCP servers →What the numbers mean for filing strategy
Four readings of the dataset that matter more for a filing decision than the raw counts alone.
Growth has already happened
The rise from 62 filings in 2017 to a 2025 peak of 168, with 109 at the 2022 midpoint, describes a field that expanded steadily and has now plateaued. A new entrant is filing into occupied claim space, not an empty one.
China and the US set the enforcement geography
With 705 filings at the Chinese office and 479 in the US against 172 at the EPO, 104 via WIPO/PCT and smaller counts in India and Australia, freedom-to-operate work should prioritise CN and US prior art before assuming European or PCT coverage is representative.
Transmission-layer claims dominate
H04L outnumbers every other subclass by a wide margin, with G06F a distant second at 697. Dedicated ciphering (G09C) and AI-assisted computation (G06N) trail well behind, at 112 and 52 respectively — signalling where claim density is light rather than absent.
Co-filing is rare and mostly intra-group
Only nine co-assignee pairs appear across 1,804 families, and the strongest links — such as IBM's own international entities, or Huawei Technologies Co., Ltd. with Institute of Information Engineering, Chinese Academy of Sciences — are corporate-affiliate or single-partner pairings rather than broad industry consortia.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to symmetric and asymmetric encryption implementation, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Huawei Technologies Co., Ltd. | Institute of Information Engineering, Chinese Academy of Sciences | 3 |
| International Business Machines Corporation (IBM) | IBM UNITED KINGDOM LTD INTELLECTUAL PROPERTY DEPARTMENT | 2 |
| International Business Machines Corporation (IBM) | IBM DEUTSCHLAND GMBH | 1 |
| Thomson Licensing | KARROUMI MOHAMED | 1 |
| Thomson Licensing | GREVIN AMAEL | 1 |
| RPK NEW ZEALAND | RAIKE WILLIAM MICHAEL | 1 |
| RPK NEW ZEALAND | MARTIN PATRICK JOHN | 1 |
| RPK NEW ZEALAND | HIGGINS SEAN JOSEPH | 1 |
With only nine co-assignee pairs identified across the entire corpus, most encryption implementation patents are filed solely by a single entity — cross-company joint filings are not a meaningful route to freedom-to-operate insight here.
Who holds the claim space — and who has stopped adding to it
The named leaders in this corpus — spanning telecom equipment makers, IT majors and consumer electronics groups — show a consistent pattern: strong historical filing, and none of them adding to it in the latest tracked year.
Filing has stopped at the top of the ranking
International Business Machines Corporation (IBM), Huawei Technologies Co., Ltd., Nippon Telegraph and Telephone Corporation (NTT), Thomson Licensing, Rizoop Volt Deva Co. and Panasonic Corporation (Japan) each show zero filings in the most recent tracked year, with Huawei Technologies Co., Ltd. registering a -100% year-over-year change. Some of this reflects publication lag, but the flat trend across every leader is too consistent to be lag alone.
IBM and Huawei anchor the only dense links
The strongest co-assignee relationship in the dataset — Huawei Technologies Co., Ltd. with Institute of Information Engineering, Chinese Academy of Sciences at three shared filings — is still modest in absolute terms. IBM's own affiliate pairings (with its UK and German IP units) round out the short list of repeat collaborations.
Foundational patents predate the current filing wave
The most-cited record in the corpus dates from the conditional-access era of pay-TV and interactive networks, well before the 2017–2025 filing run this landscape tracks. High citation counts here mark historical influence on later drafting, not present-day commercial weight.
| Assignee | Recent year | YoY |
|---|---|---|
| International Business Machines Corporation (IBM) | 0 | — |
| Huawei Technologies Co., Ltd. | 0 | -100% |
| Nippon Telegraph and Telephone Corporation (NTT) | 0 | — |
| Thomson Licensing | 0 | — |
| Rizoop Volt Deva Co. | 0 | — |
| Panasonic Corporation (Japan) | 0 | — |
| Ecocube Inc. | 0 | — |
| Bank of America Corporation | 0 | -100% |
Turning this landscape into a filing decision
The counts and rankings above describe where claim space is dense; deciding what to file next requires digging into the specific claims and the assignees behind them.
Check freedom-to-operate against the top-cited records
The most-cited patents in this corpus, several dating to the 1990s and early 2000s, still shape how later filings are drafted around key management and conditional access. Any new implementation claim should be checked against these before drafting.
Explore citation chains in EurekaMap the under-claimed IPC branches
G09C and G06N carry a fraction of the filing density of H04L and G06F. That gap is either genuine white space or an area practitioners have avoided for technical reasons — worth confirming before committing R&D spend.
Run an IPC gap analysis in EurekaTrack assignees who have gone quiet
Every leading assignee in this dataset shows zero filings in the latest tracked year. Confirm whether that reflects publication lag, a strategic pause, or a shift to trade-secret protection before assuming the space is open.
Monitor assignee activity in EurekaCommon questions about encryption implementation patents
This landscape tracks 1,804 published patent families filed between 2015 and mid-2026 within the scope of encryption algorithm implementation, key management, block cipher modes and digital signature schemes. Filings rose from 62 in 2017 to a peak of 168 in 2025. Because publication typically lags filing by around 18 months, the true count for 2025 and 2026 will end up higher once more filings publish.
The leading assignees identified in this corpus include International Business Machines Corporation (IBM) (IBM), Huawei Technologies Co., Ltd. (Huawei), Nippon Telegraph and Telephone Corporation (NTT) (NTT), Thomson Licensing (Thomson), Rizoop Volt Deva Co. and 松下电器产业株式会社 (Panasonic). Notably, every one of these leaders shows zero filings in the most recent tracked year, which suggests either a strategic pause, a shift toward other protection routes, or a filing pattern still working through publication lag. None of them show recent growth, so historical volume should not be read as current momentum.
IPC subclasses with comparatively light filing density — including G09C (dedicated ciphering and secret communication) at 112 records and G06N (AI-based computation) at 52 — sit well below the dominant H04L and G06F classes. That gap points to under-claimed territory around AI-assisted key derivation, post-quantum key exchange scheduling, and crypto-agility negotiation between differing algorithm implementations. Confirm the gap is genuine white space rather than a technically avoided dead end before filing there.
Patent applications are typically published around 18 months after filing, so any year within that window will look artificially low in a filing-trend chart. In this dataset, 2026 shows only 19 filings against a 2025 peak of 168, but that drop is a data artefact, not a real decline. Analysts should treat the final one to two years of any patent trend as a floor estimate that will rise as more applications publish.
China leads with 705 filings at its national office, followed by the United States at 479, well ahead of Europe (EPO) at 172, WIPO/PCT filings at 104, India at 78 and Australia at 39. This concentration means freedom-to-operate and competitive-clearance searches for encryption implementation should prioritise Chinese and US prior art first, since European or PCT-only searches will miss the majority of relevant filings.
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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.