ClassID:

224657

H04K1/04 - CPC Classification

Classification description:

Secret communication by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band

Recent Application in this class:
#1
20250126641
2025-04-17

MULTI-ACCESS POINT (MULTI-AP) JOINT TRANSMISSION IN A WIRELESS NETWORK

#2
20230299868
2023-09-21

OPERATING METHOD OF ELECTRONIC APPARATUS FOR TRANSMITTING SIGNAL AND ELECTRONIC APPARATUS SUPPORTING THE SAME

#3
20220368450
2022-11-17

Robust code / data hiding method against analog transmission (over the air) for digital audio

#4
20220360359
2022-11-10

COMMUNICATIONS SYSTEM

#5
20220094460
2022-03-24

Application of key exchange based physical layer security methods

#6
20210091865
2021-03-25

Intrusion detection and radio fingerprint tracking

#7
20210050032
2021-02-18

Method for preventing intelligible voice recordings

#8
20200285538
2020-09-10

Memory system for preventing write error

#9
20200145205
2020-05-07

Method for encoding and decoding data by varying the distinctive characteristics of an optical radiation, encoding device and decoding system

#10
20200099459
2020-03-26

Cooperative intrusion detection

#11
20200082123
2020-03-12

Selective enforcement of privacy and confidentiality for optimization of voice applications

#12
20200051541
2020-02-13

Masking open space noise using sound and corresponding visual

#13
20190349339
2019-11-14

Human capital management data transfer systems

#14
20190181967
2019-06-13

Cooperative intrusion detection

#15
20190147902
2019-05-16

Device and method for preventing intelligible voice recordings

#16
20190066686
2019-02-28

Selective enforcement of privacy and confidentiality for optimization of voice applications

#17
20180196712
2018-07-12

Apparatuses and methods for correcting errors and memory controllers including the apparatuses for correcting errors

#18
20180144735
2018-05-24

Masking open space noise using sound and corresponding visual

#19
20170302400
2017-10-19

Methods and apparatus to implement a third-order signal scrambler

#20
20170272182
2017-09-21

Intrusion detection and radio fingerprint tracking

#21
20160351181
2016-12-01

Masking open space noise using sound and corresponding visual

#22
20140146969
2014-05-29

Spectral and temporal stealthy fiber optic communication using sampling and phase encoding detection systems

#23
20120163604
2012-06-28

Method and device for establishing network connection

#24
20120114335
2012-05-10

System and method for transmitting optical signals

#25
20120076301
2012-03-29

Optical system with imparted secure codes

#26
20110243327
2011-10-06

System and method to prevent audio watermark detection

#27
20110228939
2011-09-22

SYSTEM AND METHODS FOR OCDM-BASED OPTICAL ENCRYPTION USING SUBSETS OF PHASE-LOCKED FREQUENCY LINES

#28
20110206203
2011-08-25

Subchannel security at the optical layer

#29
20110099365
2011-04-28

METHODS AND APPARATUS FOR MULTI-LEVEL DYNAMIC SECURITY SYSTEM

#30
20100232608
2010-09-16

OCDM-based photonic encryption system with provable security

#31
20100208912
2010-08-19

Masking sound generating apparatus, masking system, masking sound generating method, and program

#32
20100124332
2010-05-20

Secure wireless communications

#33
20090306988
2009-12-10

Systems and methods for reducing speech intelligibility while preserving environmental sounds

#34
20090199015
2009-08-06

Method for protecting audio content

#35
20080212777
2008-09-04

Methods and apparatus for multi-level dynamic security system

#36
20070083361
2007-04-12

Method and apparatus for disturbing the radiated voice signal by attenuation and masking

#37
20050271154
2005-12-08

System for allocating radio resources in multiband OFDM system

#38
20050231402
2005-10-20

Analog scrambler

#39
20050065778
2005-03-24

Secure speech

#40
20050031051
2005-02-10

Multiple access holographic communications apparatus and methods

#41
12844860
2014-09-30

Deterrence of device counterfeiting, cloning, and subversion by substitution using hardware fingerprinting