| Patents for H04L 9 - Arrangements for secret or secure communication (111,914) |
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| 03/26/1991 | US5003593 Teleconferencing method for a secure key management system |
| 03/21/1991 | WO1991003896A2 Computer communications system |
| 03/20/1991 | EP0417447A2 Data protection by detection of intrusion into electronic assemblies |
| 03/19/1991 | US5001756 Decryption device with variable clock |
| 03/19/1991 | US5001754 Encryption system and method |
| 03/19/1991 | US5001753 Crytographic system and process and its application |
| 03/19/1991 | US5001752 Public/key date-time notary facility |
| 03/19/1991 | US5001750 Secret communication control apparatus |
| 03/19/1991 | CA2025504A1 Method and device for the protected transmission of data |
| 03/14/1991 | DE4026698A1 Synchronisationsverfahren in einem mobilfunksystem Synchronization method in a mobile communications system |
| 03/13/1991 | WO1991004620A1 Synchronizing method in a mobile radio system |
| 03/13/1991 | EP0416894A2 Method and apparatus for encrypting and decrypting time domain signals |
| 03/13/1991 | CN1049946A Method of transferring data, electronic document of like, system for transferring data, electronic document or like and card to be used when carrying out method |
| 03/05/1991 | US4997288 Power supply arrangement for fault-tolerant operation in a microcomputer-based encryption system |
| 02/27/1991 | EP0414314A1 Single-number generation method for micro-chip card and use of same for the cooperation of the card with a host-system |
| 02/27/1991 | EP0413752A1 In-band controller |
| 02/27/1991 | EP0413737A1 Security system network |
| 02/26/1991 | WO1991003014A2 Method and apparatus for high precision weighted random pattern generation |
| 02/26/1991 | US4996711 Selected-exponent signature systems |
| 02/19/1991 | US4995082 Method for identifying subscribers and for generating and verifying electronic signatures in a data exchange system |
| 02/19/1991 | US4995081 Method and system for personal identification using proofs of legitimacy |
| 02/19/1991 | US4995080 Television signal scrambling system and method |
| 02/18/1991 | WO1991003113A1 Encryption system |
| 02/13/1991 | CN1011655B Restoring framing in a communications system |
| 02/12/1991 | US4993070 Ciphertext to plaintext communications system and method |
| 02/12/1991 | US4993069 Data processing |
| 02/12/1991 | US4993068 Unforgeable personal identification system |
| 02/12/1991 | US4993067 Secure satellite over-the-air rekeying method and system |
| 02/12/1991 | US4992783 Method and apparatus for controlling access to a communication system |
| 02/07/1991 | WO1991001428A1 System for protecting documents or objects enclosed in a tamper-proof container |
| 02/07/1991 | CA2016009A1 Method and apparatus for externally defining the operational mode of a digital radio transceiver |
| 02/06/1991 | EP0411712A1 Method and device for enciphering data to be transferred and for deciphering the enciphered data, and a computer system comprising such a device |
| 02/06/1991 | EP0411597A2 Telecommunication system for protected translation of digital signals by means of a passive optical bus network |
| 02/05/1991 | US4991210 Unpredictable blind signature systems |
| 02/05/1991 | US4991209 Random local message encryption |
| 02/05/1991 | CA1279924C Cryptographic system using interchangeable key blocks and selectable key fragments |
| 01/31/1991 | DE3924264A1 Electronic data key distributor with emergency erasure facility - has eeprom erased by simultaneous manual resetting of all rocker switches |
| 01/30/1991 | EP0410869A1 Method for processing data by compression and permutation for microcircuit card |
| 01/30/1991 | EP0410516A1 Processing method for an irregular permutation of data protected by encryption |
| 01/30/1991 | EP0410515A1 Rotation method for a word of "p" binary elements and device in which said method is used |
| 01/30/1991 | EP0410037A1 Hierarchical key management system |
| 01/30/1991 | CN2070519U 数字报警电话 Digital alarm call |
| 01/29/1991 | US4989245 Controlled authorization of descrambling of scrambled programs broadcast between different jurisdictions |
| 01/29/1991 | US4989244 Data encripting transfer |
| 01/29/1991 | CA1279709C Key distribution method |
| 01/24/1991 | DE3922642A1 Transmitting crypto-coded data between two subscribers - involves public code of exchange and exclusive code for each subscriber |
| 01/23/1991 | EP0409725A1 System for the protection of documents or objects locked up in a security container |
| 01/22/1991 | US4987594 Stand-alone utility device with antitheft code with method for its use |
| 01/22/1991 | US4987593 One-show blind signature systems |
| 01/16/1991 | EP0407465A1 One-show blind signature systems |
| 01/15/1991 | US4985919 Secure communication control system |
| 01/10/1991 | WO1991000661A1 Soft logic cryptographic circuit |
| 01/09/1991 | EP0407060A2 Method of providing mandatory secrecy and integrity file security in a computer system |
| 01/09/1991 | EP0406457A1 Data enciphering and deciphering method |
| 01/09/1991 | EP0406291A1 Digital data security system |
| 01/08/1991 | US4984272 Secure file handling in a computer operating system |
| 01/08/1991 | US4984271 Cipher system with closed cipher procedure |
| 01/02/1991 | EP0406187A1 Method and arrangement for encryption |
| 01/02/1991 | EP0405215A2 A method for utilizing an encrypted key as a key identifier in a data packet in a computer network |
| 01/02/1991 | CN1048271A Method and apparatus for remotely controlling and monitoring use of computer software |
| 01/02/1991 | CN1011108B Method for providing telecommunication connections with computer |
| 01/01/1991 | US4982430 Bootstrap channel security arrangement for communication network |
| 01/01/1991 | US4982429 Encipher method and decipher method |
| 01/01/1991 | US4982401 Method and apparatus for detecting transmission errors in cordless telephones |
| 01/01/1991 | US4981370 Document authentication apparatus |
| 12/28/1990 | CA2018270A1 Method for utilizing an encrypted key as a key identifier in a data packet in a computer network |
| 12/25/1990 | US4980913 Security system network |
| 12/25/1990 | US4979832 For combining a first data source and a second data source into result data |
| 12/20/1990 | DE3215975C1 Multi-channel directional ratio system - combines available channels on transmitting side in digital form in time-multiplexing framework |
| 12/19/1990 | EP0403456A2 Encryption circuit |
| 12/19/1990 | EP0403204A2 Cordless telephone systems and methods of operation |
| 12/17/1990 | WO1990016124A1 Key allocation in public communications systems taking account of security gradations |
| 12/16/1990 | CA2018926A1 Cordless telephone systems and methods of operation |
| 12/12/1990 | EP0402301A1 A method of transferring data and a system for transferring data |
| 12/12/1990 | EP0402083A2 Teleconferencing method for a secure key management system |
| 12/11/1990 | US4977596 Cryptographic synchronization recovery by measuring randomness of decrypted data |
| 12/11/1990 | US4977595 Method and apparatus for implementing electronic cash |
| 12/11/1990 | CA1277764C System for enabling descrambling on a selective- subscription basis in a subscriber communication network |
| 12/08/1990 | WO1990015490A1 A method of transferring data, an electronic document or the like, a system for transferring data, an electronic document or the like and a card to be used in accordance with the method |
| 12/05/1990 | EP0400362A2 Method for hierarchical key management with partial keys for transmitting digital information |
| 12/05/1990 | EP0400103A1 Public key diversification method. |
| 12/04/1990 | US4975952 Method of data communication |
| 11/29/1990 | WO1990014735A1 Apparatus and method for enhancing the reliability of digital messages |
| 11/28/1990 | EP0399587A1 Method for enciphering a series consisting of at least one symbol |
| 11/28/1990 | EP0398931A1 Cryptographic method and apparatus with electronically redefinable algorithm. |
| 11/20/1990 | US4972481 Ciphering and deciphering device |
| 11/20/1990 | US4972478 Soft logic cryptographic circuit |
| 11/20/1990 | US4972474 Integer encryptor |
| 11/20/1990 | US4972473 Data communication method and apparatus using neural-networks |
| 11/20/1990 | US4972472 Method and apparatus for changing the master key in a cryptographic system |
| 11/14/1990 | EP0397079A2 Parallel pseudo-random generator for emulating a serial pseudo-random generator and method for carrying out same |
| 11/14/1990 | EP0396894A2 Secure management of keys using control vectors with multi-path checking |
| 11/12/1990 | CA2016635A1 Parallel pseudo-random generator for emulating a serial pseudo-random generator and method for carrying out same |
| 11/06/1990 | US4969190 Encrypting system of data |
| 11/06/1990 | US4969189 Authentication system and apparatus therefor |
| 11/06/1990 | US4969188 Process and apparatus for the protection of secret elements in a network of encrypting devices with open key management |
| 11/01/1990 | WO1990013192A1 Method for the protection of a telecommunication link |
| 10/31/1990 | EP0395618A2 Cryptographic system by blocs of binary data |
| 10/31/1990 | CN2064961U 密码辨识器 Password identifier |
| 10/30/1990 | CA1275700C2 Method and apparatus for transceiving cryptographically encoded digital data |