| Patents for H04K 1 - Secret communication (16,771) |
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| 06/18/1996 | US5528692 Frequency inversion scrambler with integrated high-pass filter having autozero to remove internal DC offset |
| 06/12/1996 | EP0398931B1 Cryptographic method and apparatus with electronically redefinable algorithm |
| 06/05/1996 | CN1124078A Secure access telephone extension system and method |
| 06/04/1996 | US5524134 Telecommunications security module |
| 05/29/1996 | EP0714180A2 Wacs-type mobile communication with a unified frame format |
| 05/29/1996 | EP0713621A1 Method and apparatus for uniquely encrypting a plurality of services at a transmission site |
| 05/23/1996 | WO1996005670A3 Digital radio with vocoding encrypting codec |
| 05/22/1996 | CN1123076A A method and system for audio information dissemination using various transmission modes |
| 05/22/1996 | CN1122975A Digital voice privacy apparatus and method |
| 05/14/1996 | US5517568 Method of detecting unauthorized use of a wireless communication channel |
| 05/09/1996 | WO1996013920A1 Method and apparatus for secure identification of a mobile user in a communication network |
| 04/24/1996 | EP0708561A2 Method and apparatus for free previews of communication network services |
| 04/16/1996 | US5509072 Communication apparatus |
| 04/10/1996 | CN1120377A Generation of optical signals with RF components |
| 04/09/1996 | US5506904 System and method for transmitting and receiving variable length authorization control for digital services |
| 04/09/1996 | US5506889 Digital voice privacy apparatus and method |
| 04/02/1996 | US5504815 Method and apparatus for scrambling and descrambling |
| 03/31/1996 | CA2154410A1 Digital voice privacy apparatus and method |
| 03/26/1996 | US5502766 Data enclave and trusted path system |
| 03/14/1996 | WO1996008092A1 Roving software license for a hardware agent |
| 03/13/1996 | EP0700617A1 Secure communication system |
| 03/13/1996 | EP0700614A1 Nonlinear dynamic substitution devices and methods for block substitutions |
| 03/12/1996 | US5499297 System and method for trusted path communications |
| 03/06/1996 | EP0699360A1 Method and apparatus for signal transmission and reception |
| 02/28/1996 | EP0698320A1 A repertoire of mappings for a cryptosystem |
| 02/22/1996 | WO1996005698A1 Method of and apparatus for scrambling a video signal with full network transmission and recording capability |
| 02/22/1996 | WO1996005670A2 Digital radio with vocoding encrypting codec |
| 02/20/1996 | US5493612 Secure communication keying system |
| 02/14/1996 | CN1116890A Apparatus and method for storing data |
| 02/07/1996 | EP0695485A1 Fair cryptosystems and methods of use |
| 02/07/1996 | CN1030955C Independent external security module for digitally upgradeable television signal decoder |
| 01/30/1996 | US5488663 Encoding methods for generating a digital signal containing modulated bit allocation information, and record carriers containing that signal |
| 01/24/1996 | CN1030809C Authentication system for digital cellular communications |
| 01/16/1996 | US5485520 Automatic real-time highway toll collection from moving vehicles |
| 01/10/1996 | EP0691059A1 Secure access telephone extension system and method |
| 12/27/1995 | EP0688480A1 A method and system for audio information dissemination using various transmission modes |
| 12/27/1995 | EP0455699B1 Method and apparatus for preventing external detection of signal information |
| 12/27/1995 | CN1114091A method for automatically authorizing payment for bank bill and the system for carrying out the method |
| 12/26/1995 | US5479514 Method and apparatus for encrypted communication in data networks |
| 12/05/1995 | US5473693 Apparatus for avoiding complementarity in an encryption algorithm |
| 12/05/1995 | US5473692 Roving software license for a hardware agent |
| 11/28/1995 | US5471531 Method and apparatus for low cost audio scrambling and descrambling |
| 11/28/1995 | CA2037326C Communication apparatus for speech signal |
| 11/22/1995 | EP0683614A1 Reception apparatus and method |
| 11/22/1995 | EP0682830A1 A multiplex control packet for digital services |
| 11/15/1995 | EP0682428A2 Bidirectional wireless communications system with initialization of scrambling/descrambling sequences using multiple identification codes |
| 11/08/1995 | EP0681380A1 Frequency inversion scrambler with integrated high-pass filter |
| 11/02/1995 | EP0680171A2 Low power security mode for a cellular telephone |
| 11/02/1995 | DE4413523A1 Information system EM field superimposition method |
| 10/31/1995 | USRE35078 Method and apparatus for encrypting and decrypting time domain signals |
| 10/25/1995 | EP0679029A1 System for cooperating with a satellite transponder |
| 10/18/1995 | EP0677939A2 Wireless communications privacy method and system |
| 10/18/1995 | CN1110444A Line for automatic transmitting cipher |
| 10/03/1995 | US5455861 Secure telecommunications |
| 10/03/1995 | CA2003698C Off-premises cable television channel interdiction method and apparatus |
| 10/03/1995 | CA1337214C In-band controller |
| 09/20/1995 | EP0672273A1 Method and apparatus for encryption having a feedback register with selectable taps |
| 09/13/1995 | EP0671830A2 Secure communication apparatus and method |
| 09/13/1995 | EP0671701A1 Magnetic card and device for reading this card |
| 09/05/1995 | US5448643 Authenticaton system |
| 09/05/1995 | US5448640 Parallel distributed sample descrambling circuit for cell-based asynchronous transfer mode physical layer |
| 08/30/1995 | EP0669741A2 Method and apparatus for encrypted communication in data networks |
| 08/15/1995 | US5442341 Remote control security system |
| 08/15/1995 | CA1336721C Cryptographic method and apparatus with electrically redefinable algorithm |
| 08/01/1995 | US5438620 Method and apparatus for scrambling and descrambling of video signal with edge fill |
| 08/01/1995 | US5438332 Method of hardening transmissions, in particular between a control station and a transponder, and a device implementing the method |
| 07/20/1995 | WO1995019668A1 A method and system for audio information dissemination using various transmission modes |
| 07/19/1995 | CN1105510A Method and apparatus for coherent communication in a spread-spectrum communication system |
| 07/18/1995 | US5434920 Secure telecommunications |
| 07/13/1995 | WO1995012922A3 Method and apparatus for low cost audio scrambling and descrambling |
| 07/11/1995 | US5432697 Technique for controlling the symbolic dynamics of chaotic systems to generate digital communications waveforms |
| 07/05/1995 | EP0660985A1 Adaptive data recovery for spread spectrum systems |
| 07/04/1995 | US5430800 Facsimile apparatus |
| 06/28/1995 | EP0660563A1 Apparatus for implementing a symmetric block ciphering algorithm without the complementation property |
| 06/28/1995 | EP0660562A2 Clock frequency modulation for secure microprocessors |
| 06/28/1995 | EP0660559A1 Multicarrier frequency-hopping communication system |
| 06/28/1995 | EP0446280B1 Off-premises cable television channel interdiction method and apparatus |
| 06/14/1995 | EP0658054A2 Apparatus and method for securing communication systems |
| 06/13/1995 | CA2012549C Method and apparatus for descrambling a television signal |
| 06/08/1995 | WO1995015634A1 System and method for transmitting and receiving variable length authorization control for digital services |
| 06/08/1995 | WO1995015633A1 A non-deterministic public key encryption system |
| 06/08/1995 | WO1995015627A1 Process and device for speech scrambling and unscrambling in speech transmission |
| 06/06/1995 | US5422953 Personal date/time notary device |
| 06/06/1995 | CA2013982C Functionally modifiable cable television converter system |
| 05/23/1995 | CA2077084C Hole placement and fill system based on category selection |
| 05/17/1995 | CN1028468C Off premises cable television channel interdiction method and apparatus |
| 05/11/1995 | WO1995012922A2 Method and apparatus for low cost audio scrambling and descrambling |
| 05/03/1995 | EP0651533A2 Method and apparatus for privacy and authentication in a mobile wireless network |
| 04/25/1995 | US5410599 Voice and data encryption device |
| 04/13/1995 | WO1995010147A1 Automatic real-time highway toll collection from moving vehicles |
| 04/12/1995 | EP0648031A2 Audio scrambling system for scrambling and descrambling audio signals |
| 04/11/1995 | US5406627 Digital data cryptographic system |
| 04/04/1995 | US5404402 Clock frequency modulation for secure microprocessors |
| 04/04/1995 | US5404394 Secure communication system |
| 03/22/1995 | EP0643889A1 Method and apparatus for coherent communication in a spread-spectrum communication system |
| 03/21/1995 | US5400404 Modulation/demodulation circuit and communication system utilizing the same |
| 03/21/1995 | US5400401 In a communications system |
| 03/09/1995 | WO1995006906A1 Method and apparatus for encryption having a feedback register with selectable taps |
| 03/08/1995 | EP0642279A2 Secure telecommunications |
| 03/08/1995 | EP0642278A2 Secure telecommunications |