H04L 9/50
Cryptographic mechanisms or cryptographic arrangements for secret or secure communications: using hash
Official title: {using hash chains, e.g. blockchains or hash trees}
H04L9/50 (Cryptographic mechanisms or cryptographic arrangements for secret or secure communications: using hash) appears on 12,483 US grants and 17,811 published applications in this corpus.
Search patents in H04L- Granted patents
- 12,483
- Published applications
- 17,811
- Assignees
- 3,957
- Inventors
- 20,664
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 4 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 4 | 0 |
| 1998 | 6 | 0 |
| 1999 | 8 | 0 |
| 2000 | 5 | 0 |
| 2001 | 11 | 7 |
| 2002 | 8 | 20 |
| 2003 | 6 | 14 |
| 2004 | 9 | 23 |
| 2005 | 7 | 31 |
| 2006 | 17 | 30 |
| 2007 | 21 | 37 |
| 2008 | 28 | 34 |
| 2009 | 13 | 40 |
| 2010 | 41 | 39 |
| 2011 | 21 | 33 |
| 2012 | 45 | 47 |
| 2013 | 41 | 46 |
| 2014 | 52 | 44 |
| 2015 | 53 | 56 |
| 2016 | 48 | 140 |
| 2017 | 64 | 286 |
| 2018 | 132 | 578 |
| 2019 | 417 | 1676 |
| 2020 | 1071 | 2888 |
| 2021 | 1640 | 2579 |
| 2022 | 2011 | 2082 |
| 2023 | 1859 | 2116 |
| 2024 | 1924 | 2162 |
| 2025 | 1868 | 1608 |
| 2026 | 1041 | 1195 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Client/server protocol for proving authenticity655US 6,085,320 ARSA Security Inc. · 2000
- Method of providing digital signatures579US 4,309,569 AThe Board of Trustees of the Leland Stanford Junior University · 1982
- Blockchain identity management system based on public identities ledger555US 9,635,000 B12017
- Protected resource access control utilizing credentials based on message authentication codes and hash chain values517US 8,984,602 B1EMC Corporation · 2015
- Protected resource access control utilizing intermediate values of a hash chain515US 8,990,905 B1EMC Corporation · 2015