H04K 1/00
Secret communication
H04K1/00 (Secret communication) appears on 1,432 US grants and 1,127 published applications in this corpus.
Search patents in H04K- Granted patents
- 1,432
- Published applications
- 1,127
- Assignees
- 650
- Inventors
- 2,487
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 24 | 0 |
| 1977 | 11 | 0 |
| 1978 | 11 | 0 |
| 1979 | 18 | 0 |
| 1980 | 23 | 0 |
| 1981 | 12 | 0 |
| 1982 | 11 | 0 |
| 1983 | 13 | 0 |
| 1984 | 7 | 0 |
| 1985 | 8 | 0 |
| 1986 | 17 | 0 |
| 1987 | 11 | 0 |
| 1988 | 13 | 0 |
| 1989 | 19 | 0 |
| 1990 | 20 | 0 |
| 1991 | 16 | 0 |
| 1992 | 19 | 0 |
| 1993 | 19 | 0 |
| 1994 | 15 | 0 |
| 1995 | 15 | 0 |
| 1996 | 13 | 0 |
| 1997 | 11 | 0 |
| 1998 | 22 | 0 |
| 1999 | 14 | 0 |
| 2000 | 13 | 0 |
| 2001 | 16 | 7 |
| 2002 | 21 | 39 |
| 2003 | 21 | 41 |
| 2004 | 13 | 42 |
| 2005 | 19 | 57 |
| 2006 | 36 | 84 |
| 2007 | 34 | 129 |
| 2008 | 59 | 83 |
| 2009 | 45 | 50 |
| 2010 | 78 | 53 |
| 2011 | 73 | 56 |
| 2012 | 60 | 28 |
| 2013 | 63 | 33 |
| 2014 | 76 | 38 |
| 2015 | 52 | 39 |
| 2016 | 41 | 39 |
| 2017 | 41 | 34 |
| 2018 | 27 | 30 |
| 2019 | 46 | 37 |
| 2020 | 43 | 53 |
| 2021 | 52 | 35 |
| 2022 | 32 | 41 |
| 2023 | 37 | 22 |
| 2024 | 33 | 29 |
| 2025 | 26 | 20 |
| 2026 | 13 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H04K 1/02Secret communication: by adding a second signal to make the desired signal305
- H04K 1/04Secret communication: by frequency scrambling, i.e. by transposing or inverting parts of119
- H04K 1/10Secret communication: by using two signals transmitted simultaneously or successively112
- H04K 1/06Secret communication: by transmitting the information or elements thereof at unnatural speeds95
- H04K 1/003Secret communication: by varying carrier frequency at or within predetermined or random77
- H04K 1/006Secret communication: by varying or inverting the phase, at periodic or random51
- H04K 1/08Secret communication: by varying the polarisation of transmitted waves16
Recent patents
- Flexible reference frequency allocation for smart jamming mitigation25 Aug 2026US 12,720,514 B2Nokia Technologies Oy
- System and method for controlling time dilation in time-sensitive networks18 Aug 2026US 12,712,659 B2Dolby Intellectual Property Licensing, LLC
- System and method for omnichannel social engineering attack avoidance4 Aug 2026US 12,701,135 B2Telepathy Labs, Inc.
- Communications system to adjust a signal scrambler26 May 2026US 12,640,833 B2Intel Corporation
- Performing authentication19 May 2026US 12,632,546 B1Raven White Security, Inc.
- Covert transmission method against active and passive cooperative attacks in cognitive radio network20 Aug 2026US 2026/0246557 A1China Three Gorges University
- Wireless audio system and method for wirelessly communicating audio information11 Jun 2026US 2026/0161344 A1Bestechnic (Shanghai) Co., Ltd.
- System and method for secure processing of speech signals using pseudo-speech representations16 Apr 2026US 2026/0105907 A1Microsoft Technology Licensing, LLC
- Lane scrambling over network communication channels5 Mar 2026US 2026/0067020 A1Mellanox Technologies, Ltd.
- Communication method and apparatus5 Mar 2026US 2026/0067152 A1
Most cited
By later US patents
- Remote medical supporting system1,503US 7,386,730 B2Olympus Corporation · 2008
- Computer system linked by using information in data objects1,131US 6,122,403 ADigimarc Corporation · 2000
- Signal processing apparatus and methods832US 4,694,490 A1987
- Signal processing appparatus and methods797US 5,335,277 AThe Personalized Mass Media Corporation · 1994
- Signal processing apparatus and methods615US 4,965,825 AThe Personalized Mass Media Corporation · 1990