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Class Information
Number: 380/254
Name: Cryptography > Electric signal masking > By signal having discrete step amplitude variation
Description: Subject matter wherein the amplitude of the masking signal varies in discrete steps.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7613296 |
M6 block cipher system and method for encoding content and authenticating a device |
Nov. 3, 2009 |
| 7606388 |
Contents border detection apparatus, monitoring method, and contents location detection method and program and storage medium therefor |
Oct. 20, 2009 |
| 7599927 |
Method for searching content particularly for extracts common to two computer files |
Oct. 6, 2009 |
| 7482946 |
Method and apparatus for camouflaging business-activity information in a telemetry signal |
Jan. 27, 2009 |
| 7482947 |
Camouflaging business-activity information in a telemetry signal through randomization |
Jan. 27, 2009 |
| 7317796 |
System and method for video stream encryption |
Jan. 8, 2008 |
| 7003118 |
High performance IPSEC hardware accelerator for packet classification |
Feb. 21, 2006 |
| 6901514 |
Secure oblivious watermarking using key-dependent mapping functions |
May. 31, 2005 |
| 6889324 |
Digital measurement apparatus and image measurement apparatus |
May. 3, 2005 |
| 6330335 |
Audio steganography |
Dec. 11, 2001 |
| 6175627 |
Apparatus and method for embedding and extracting information in analog signals using distributed signal features |
Jan. 16, 2001 |
| 5832057 |
Lockout device for preventing telephone eavesdropping from an extension device, and method |
Nov. 3, 1998 |
| 5613001 |
Digital signature verification technology for smart credit card and internet applications |
Mar. 18, 1997 |
| 5422919 |
EMI suppression coding |
Jun. 6, 1995 |
| 5319708 |
System for the simultaneous coding of a number of television signals and for decoding thereof in radiofrequency |
Jun. 7, 1994 |
| 5283807 |
EMI suppression coding |
Feb. 1, 1994 |
| 5165098 |
System for protecting digital equipment against remote access |
Nov. 17, 1992 |
| 5029210 |
Cooperative communication system |
Jul. 2, 1991 |
| 4932057 |
Parallel transmission to mask data radiation |
Jun. 5, 1990 |
| 4737990 |
Unauthorized channel jamming signal applying method for CATV system |
Apr. 12, 1988 |
| 4644396 |
Gate circuit for central control of CATV system |
Feb. 17, 1987 |
| 4636852 |
Scrambling and descrambling of television signals for subscription TV |
Jan. 13, 1987 |
| 4361729 |
Narrowband analog message privacy system |
Nov. 30, 1982 |
| 4208545 |
Secrecy system |
Jun. 17, 1980 |
| 4188580 |
Secure communication system |
Feb. 12, 1980 |
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