Patents
Sitemap › H04 - Electric communication technique › H04K - Secret communication; Jamming of communication › H04K 1 - Secret communication
Patents for H04K 1 - Secret communication (16,771)
11/1998
11/04/1998CN1198275A Method and apparatus for transporting auxiliary data in audio signals
11/03/1998US5832214 Method and apparatus for data security for a computer
10/1998
10/28/1998EP0775419B1 Method of and apparatus for scrambling a video signal with network transmission and recording capability
10/28/1998CN1197338A Dynamic secret communicating method and system
10/13/1998US5822436 Photographic products and methods employing embedded information
10/13/1998US5822428 Data encryption for product information and access
10/13/1998US5822360 Method and apparatus for transporting auxiliary data in audio signals
10/08/1998WO1998044678A1 Encryption device for information in binary code
10/06/1998US5819108 Programming of software into programmable memory within a peripheral device
09/1998
09/30/1998CN1194744A Decryption of retransmitted data in an encrypted communication system
09/30/1998CN1194521A JTIDS signal direction finding and hopping-relieving intercept receiving method based on first-order bandpass sampling
09/29/1998US5815572 Video scrambling
09/22/1998CA2146439C Method and apparatus for encryption having a feedback register with selectable taps
09/22/1998CA2127042C Secure telecommunications
09/15/1998US5809148 Decryption of retransmitted data in an encrypted communication system
09/08/1998US5805635 Secure communication system
09/03/1998WO1998027504A3 Method and apparatus for embedding auxiliary data in a primary data signal
08/1998
08/27/1998WO1998037391A1 Process control transmitter with adaptive analog-to-digital converter
08/27/1998CA2282536A1 Process control transmitter with adaptive analog-to-digital converter
08/25/1998US5799088 Non-deterministic public key encrypton system
08/25/1998CA2128307C Secure telecommunications
08/18/1998US5796838 Method and apparatus for performing frequency spectrum inversion
08/18/1998US5796830 Interoperable cryptographic key recovery system
08/18/1998US5796782 Digital modulator with Root-Nyquist filter
08/12/1998EP0729678B1 Process and device for speech scrambling and unscrambling in speech transmission
08/11/1998US5793871 Optical encryption interface
08/11/1998US5793870 Display system
08/05/1998CN1189947A Cryptographic acess and labeling system
08/04/1998US5790666 Decryptor
07/1998
07/29/1998CN1189031A Analog signal launch modulating encryption and receiving control system
07/28/1998US5787180 Method of connecting a scrambler or encryption device to a hand-held portable cellular telephone
07/14/1998CA2087722C Authentication system for digital cellular communications
07/08/1998EP0852086A1 Method and apparatus for transporting auxiliary data in audio signals
07/08/1998EP0660985A4 Adaptive data recovery for spread spectrum systems.
07/07/1998US5778073 Method and device for speech encryption and decryption in voice transmission
07/07/1998US5777771 Generation of optical signals with RF components
06/1998
06/25/1998WO1998027504A2 Method and apparatus for embedding auxiliary data in a primary data signal
06/25/1998CA2273993A1 Method and apparatus for embedding auxiliary data in a primary data signal
06/23/1998US5771287 Apparatus and method for secured control of feature set of a programmable device
06/16/1998US5768377 Video signal descrambling apparatus
06/16/1998US5768376 Video signal scrambling apparatus
06/16/1998US5768374 Apparatus and method for continuous scrambling while transmitting or receiving synchronization data
06/11/1998WO1998025385A1 Method and system for improving security in network applications
06/11/1998CA2273252A1 Method and system for improving security in network applications
06/10/1998EP0846375A1 Process and device for the scalable coding of audio signals
06/10/1998EP0698320A4 A repertoire of mappings for a cryptosystem
06/03/1998CN1183684A Apparatus and method for providing secured communications
05/1998
05/26/1998USRE35808 Fair cryptosystems and methods of use
05/13/1998EP0841604A2 Personal date/time notary device
05/12/1998US5751806 Audio information dissemination using various transmission modes
05/06/1998EP0839417A1 Decryption of retransmitted data in an encrypted communication system
05/05/1998US5748763 Image steganography system featuring perceptually adaptive and globally scalable signal embedding
04/1998
04/28/1998US5745389 System and mechanism for assigning pre-established electronic addresses to printed circuit boards
04/21/1998US5742612 Method and device for interleaving a sequence of data elements
04/15/1998CN1179249A Establishment of cryptographic keys in radio networks
04/15/1998CN1179248A Apparatus and method for generating pseudorandom quantities based upon radio channel characteristics
04/07/1998CA2088111C Method and apparatus for using orthogonal coding in a communication system
04/02/1998DE19726079A1 Interception prevention method for cordless telephone
03/1998
03/26/1998WO1998012876A1 Methods and apparatus for encrypting and decrypting midi files
03/25/1998CN1177244A Secret, counter-wiretap, double direction telephone automatically monitoring recording circuit
03/18/1998EP0829151A1 Method of encoding sequences consisting of figure-coded data units
03/10/1998US5727064 Cryptographic system for wireless communications
03/03/1998US5724414 Secure communication system
02/1998
02/12/1998WO1998006195A1 Method and apparatus for echo data hiding in audio signals
02/12/1998WO1998006190A1 Packet-switched spread-spectrum system
02/11/1998EP0823159A1 Methods and systems for securing communication within a boundary
02/11/1998EP0722639A4 Automatic real-time highway toll collection from moving vehicles
02/10/1998US5717762 WACS-type mobile communication with a unified frame format
02/05/1998WO1998005143A1 Cryptographic key recovery system
02/04/1998EP0822482A2 Data processing device with a microprocessor and an additional computing unit
02/03/1998US5715332 Image transmission method, and apparatus therefor
02/03/1998CA2102082C Despreading technique for cdma systems
01/1998
01/27/1998US5712915 Encrypted digital circuit multiplication system
01/20/1998US5710816 Method and apparatus for ensuring receipt of voicemail messages
01/20/1998CA2075257C Wireless telephone with frequency inversion scrambling
12/1997
12/31/1997WO1997050205A1 Digitally signing agreements from remotely located nodes
12/30/1997CA2163023C Secure communication system
12/24/1997WO1997049211A1 Method and apparatus for data processing
12/17/1997CN1168038A Arrangement and method for checking identification signal
12/10/1997EP0812111A2 Method of scrambling three-dimensional image
12/10/1997EP0643889A4 Method and apparatus for coherent communication in a spread-spectrum communication system.
12/10/1997CN1167381A Identification signal reording method and device
12/09/1997US5696826 Method and apparatus for encrypting and decrypting information using a digital chaos signal
12/03/1997CN1166899A Scrambled information transmitting and receiving method
11/1997
11/30/1997CA2177622A1 Cryptographic data integrity apparatus and method based on pseudo-random bit generators
11/27/1997WO1997044934A1 Decryption of retransmitted data in an encrypted communication system
11/26/1997EP0808972A2 Identification signal registering method and apparatus
11/19/1997EP0808042A2 Automatic adaptation of a cryptographic device to a telephone
11/19/1997EP0807733A2 Identification signal checking apparatus and methods
11/19/1997EP0807732A2 Checking of identification signals
11/05/1997EP0805599A2 Video encoder/decoder with scrambling functions
11/05/1997EP0804840A2 Apparatus and method for generating pseudorandom quantities based upon radio channel characteristics
11/05/1997EP0804839A1 Establishment of cryptographic keys in radio networks
11/05/1997CN1164152A Encrypting apparatus and encrypting method
10/1997
10/29/1997CN1163521A Control and safety system for electronic servitude
10/28/1997US5682404 Method and apparatus for signal transmission and reception
10/22/1997CN1163030A Digital radio with vocoding encrypting coder
10/15/1997EP0800745A1 Time-shifted conditional access
10/08/1997EP0799538A1 Scrambled information transmitting and receiving
09/1997
09/18/1997WO1997034404A1 Infrared communications system and method
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