| Patents for G09C 1 - Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system (12,544) |
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| 11/28/1991 | WO1991018459A2 Device for converting a digital block and the use thereof |
| 11/26/1991 | US5068895 Encryption and decryption methods using bit-length preservation decryptor |
| 11/26/1991 | US5068894 Method of generating a unique number for a smart card and its use for the cooperation of the card with a host system |
| 11/21/1991 | EP0457709A1 Cipher machine |
| 10/28/1991 | WO1991017614A2 Distributed information system having automatic invocation of key management negotiations protocol and method |
| 10/22/1991 | US5060265 Method of protecting a linear feedback shift register (LFSR) output signal |
| 10/16/1991 | EP0451476A2 Secure key management using programmable control vector checking |
| 10/15/1991 | US5058161 Method and apparatus for secure identification and verification |
| 10/15/1991 | US5058157 Method and apparatus for encrypting and decrypting time domain signals |
| 10/08/1991 | US5056142 Decryption device |
| 10/08/1991 | US5056137 Method and apparatus for encoding and decoding signals |
| 10/03/1991 | WO1991014980A1 Process for authenticating a user using a data station |
| 10/02/1991 | EP0449716A1 System for condensing digital data |
| 10/02/1991 | EP0449349A1 Method for the modular reduction of numbers |
| 10/02/1991 | EP0449265A2 Random number generator |
| 10/01/1991 | US5054067 Block-cipher cryptographic device based upon a pseudorandom nonlinear sequence generator |
| 09/26/1991 | DE4008971A1 Verfahren zur authentifizierung eines eine datenstation benutzenden anwenders A method for authentication of a data-station-use product user |
| 09/17/1991 | CA1289240C Method to authentify external validation data by means of a portable device such as a memory card |
| 09/17/1991 | CA1289239C Method for certifying the authenticity of data exchanged between two devicesconnected by a transmission line |
| 09/10/1991 | US5048086 Encryption system based on chaos theory |
| 09/03/1991 | US5046096 Windowed rotatable cover which reveals one indicia on one surface and a second indicia on a second surface corresponding to the first that encodes and decodes messages |
| 08/28/1991 | EP0443752A2 Block-cipher cryptographic device based upon a pseudorandom nonlinear sequence generator |
| 08/28/1991 | EP0443679A1 Coding method, according to the RSA method, by a microcontroller and a device using this method |
| 08/20/1991 | US5042067 Password security method |
| 08/14/1991 | EP0290589A4 Fully programmable linear feedback shift register |
| 08/08/1991 | WO1991011794A1 Equipment for protecting data in a data-processing system |
| 08/06/1991 | US5038376 Block substitution based encryption by a modulo 2 addition method and apparatus |
| 07/31/1991 | CN2082006U Anti-theft puzzle lock for tv set |
| 07/24/1991 | EP0438154A2 Multimedia network system |
| 07/10/1991 | EP0265477B1 Data conversion |
| 07/09/1991 | US5031215 Unambiguous alphabet for data compression |
| 06/26/1991 | EP0434551A1 Method of generating a pseudo-random number in a dataprocessing-system, and a system for carrying out the method |
| 06/26/1991 | EP0434550A1 Method of generating a pseudo-random number in a portable electronic objects system and a system for carrying out the method |
| 06/20/1991 | WO1991009382A1 Method for generating a random number in a system comprising portable electronic objects, and system for implementing said method |
| 06/20/1991 | WO1991009381A1 Method for generating a random number in a data processing system, and system for implementing said method |
| 06/19/1991 | EP0432186A1 Form and procedure for selecting a code to be kept secret. |
| 06/18/1991 | US5025479 Recognition method for character set |
| 06/05/1991 | EP0429824A2 Secure key management using control vector translation |
| 06/04/1991 | US5022080 Electronic notary |
| 05/22/1991 | CN1051650A Method and apparatus for encrypting and decrypting time domain signals |
| 05/15/1991 | EP0427465A2 Databaseless security system |
| 05/14/1991 | CA1284223C System and method for diversifying a basic key and authenticating saidkey |
| 05/02/1991 | EP0425053A1 Data processing system having memory card authenticating means, electronic circuit for use in that system and method for using this authentication |
| 04/23/1991 | US5010572 Distributed information system having automatic invocation of key management negotiations protocol and method |
| 04/18/1991 | WO1991005421A1 Method and apparatus for encoding and decoding signals |
| 04/17/1991 | EP0422757A2 Public/key date-time notary facility |
| 04/16/1991 | US5008935 Efficient method for encrypting superblocks of data |
| 04/10/1991 | EP0421754A2 Block substitution based encryption by a modulo 2 addition method and apparatus |
| 04/09/1991 | US5007089 Secure key management using programable control vector checking |
| 04/02/1991 | US5005200 Public key/signature cryptosystem with enhanced digital signature certification |
| 03/27/1991 | EP0418742A1 Method and device for secure data transmission |
| 03/27/1991 | EP0418328A1 Card-computer moderated systems. |
| 03/26/1991 | US5003596 Method of cryptographically transforming electronic digital data from one form to another |
| 03/19/1991 | US5001753 Crytographic system and process and its application |
| 03/19/1991 | US5001752 Public/key date-time notary facility |
| 03/19/1991 | CA2025504A1 Method and device for the protected transmission of data |
| 03/13/1991 | EP0416894A2 Method and apparatus for encrypting and decrypting time domain signals |
| 03/12/1991 | CA1281420C Transaction approval 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 |
| 02/19/1991 | US4995082 Method for identifying subscribers and for generating and verifying electronic signatures in a data exchange system |
| 02/18/1991 | WO1991003113A1 Encryption system |
| 02/12/1991 | US4993069 Data processing |
| 02/05/1991 | CA1279924C Cryptographic system using interchangeable key blocks and selectable key fragments |
| 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 |
| 01/16/1991 | EP0407465A1 One-show blind signature systems |
| 01/08/1991 | US4984271 Cipher system with closed cipher procedure |
| 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 | EP0265497A4 Information transfer and use, particularly with respect to objects such as gambling chips |
| 01/01/1991 | US4982429 Encipher method and decipher method |
| 01/01/1991 | US4982401 Method and apparatus for detecting transmission errors in cordless telephones |
| 12/28/1990 | CA2018270A1 Method for utilizing an encrypted key as a key identifier in a data packet in a computer network |
| 12/04/1990 | CA1277421C Personal identification encryptor system and method |
| 11/22/1990 | EP0397664A1 Personal identification encryptor system with error-correcting code and method |
| 11/20/1990 | US4972477 Encoder/decoder |
| 11/14/1990 | EP0396894A2 Secure management of keys using control vectors with multi-path checking |
| 11/06/1990 | US4969190 Encrypting system of data |
| 11/06/1990 | US4969188 Process and apparatus for the protection of secret elements in a network of encrypting devices with open key management |
| 10/24/1990 | EP0393806A2 Cryptographic method and apparatus for public key exchange with authentication |
| 10/23/1990 | US4965766 Digital input/out circuit capable of sending and receiving data in different modes |
| 10/03/1990 | EP0389895A1 Method and apparatus for user identification based on permuted kernels |
| 10/03/1990 | CN1045875A Cryptographic electronic program controller and application method thereof |
| 10/02/1990 | US4961221 Communication method and system with encryption of information |
| 09/26/1990 | EP0238537B1 System for preventing software piracy employing multi-encrypted keys and single decryption circuit modules |
| 09/19/1990 | EP0387599A2 Method of encrypting transmitted data using a unique key |
| 09/12/1990 | EP0386867A2 Improved public key/signature cryptosystem with enhanced digital signature certification |
| 09/11/1990 | US4956863 Cryptographic method and apparatus for public key exchange with authentication |
| 08/29/1990 | EP0384475A1 Method for subscriber identification and for the generation and verification of electronic signatures in a data exchange system |
| 08/29/1990 | EP0383985A1 Method for subscriber identification and for generation and verification of electronic signatures in a data exchange system |
| 08/28/1990 | US4953211 Encryption apparatus |
| 08/28/1990 | US4953209 Self-verifying receipt and acceptance system for electronically delivered data objects |
| 08/16/1990 | EP0382410A2 Memory aid |
| 08/08/1990 | EP0381523A2 Server-aided computation method and distributed information processing unit |
| 08/07/1990 | US4947430 Undeniable signature systems |
| 07/18/1990 | EP0377706A1 System and method for the secure handling of encryptor keys. |
| 07/12/1990 | WO1990007846A1 Process for scrambling pal secam and ntsc composite video signals and decoder of resulting scrambled signals |
| 07/10/1990 | US4941176 In a data processing system |
| 06/27/1990 | EP0375540A1 Method for scrambling composite PAL, SECAM and NTSC video signals, and decoder for signals scrambled by this method |
| 06/27/1990 | EP0374225A1 Method and device for authentication. |