Method and apparatus for generatng a cover image for steganography
US-2019356476-A1 · Nov 21, 2019 · US
by adding a second signal to make the desired signal unintelligible
by adding a second signal to make the desired signal unintelligible · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04K1/02 |
| Official title | by adding a second signal to make the desired signal unintelligible |
| Display label | by adding a second signal to make the desired signal unintelligible |
| Total patents | 128 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 15 |
| 2016 | 11 |
| 2017 | 15 |
| 2018 | 7 |
| 2019 | 15 |
| 2020 | 16 |
| 2021 | 9 |
| 2022 | 9 |
| 2023 | 11 |
| 2024 | 5 |
| 2025 | 13 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Transceiver and transceiver systems
US-2019334720-A1 · Oct 31, 2019 · US
Voice command masking systems and methods
US-10424299-B2 · Sep 24, 2019 · US
Apparatus and method for secure communication using artificial noise scheme
US-2019229833-A1 · Jul 25, 2019 · US
Supplementary apparatus, methods and computer program products, for cdma encapsulation
US-2019207645-A1 · Jul 4, 2019 · US
Apparatus and method for physical layer security commuication in wireless communication system
US-2019181974-A1 · Jun 13, 2019 · US
High-security communication system, and transmitter and receiver both used therein
US-10305681-B2 · May 28, 2019 · US
Space-time coding with separation
US-10305622-B1 · May 28, 2019 · US
Node apparatus and node apparatus control method
US-10288826-B2 · May 14, 2019 · US
Multi-pulse communication using spreading sequences
US-10237056-B2 · Mar 19, 2019 · US
Physical layer encryption using out-phased array linearized signaling
US-10225039-B2 · Mar 5, 2019 · US
Provision of a secured replica pseudo random noise signal
US-10225038-B2 · Mar 5, 2019 · US
Secure open-air communication system utilizing multichannel decoyed transmission
US-10110322-B2 · Oct 23, 2018 · US
Systems and methods for securing wireless communications
US-10069592-B1 · Sep 4, 2018 · US
Reference Signal Scrambling for Random Access
US-2018206272-A1 · Jul 19, 2018 · US
Traffic shape obfuscation when using an encrypted network connection
US-9973516-B2 · May 15, 2018 · US
Traffic shape obfuscation when using an encrypted network connection
US-9942247-B2 · Apr 10, 2018 · US
Process and system for determining a distance between a wearable object and a base station
US-2018095172-A1 · Apr 5, 2018 · US
Secure open-air communication system utilizing multichannel decoyed transmission
US-2018019826-A1 · Jan 18, 2018 · US
Magnetic stripe reader tamper protection
US-9852422-B1 · Dec 26, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04K1/02?
- CPC H04K1/02 is the Cooperative Patent Classification code for “by adding a second signal to make the desired signal unintelligible.”
- How many patents are filed under CPC H04K1/02 (by adding a second signal to make the desired signal unintelligible)?
- Our database includes 128 publications tagged with this CPC code.
- Is patent activity under CPC H04K1/02 growing?
- Publication counts under this code: 5 in 2024 vs 13 in 2025 (latest complete years).