| 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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| 07/19/1994 | US5331436 Encoder and decoder |
| 07/07/1994 | WO1994015423A1 A cryptographic method |
| 07/07/1994 | WO1994015422A1 System and method for key distribution using quantum cryptography |
| 07/07/1994 | WO1994015421A1 Method of extending the validity of a cryptographic certificate |
| 07/06/1994 | EP0605289A1 Method and apparatus for authentication using a zero knowledge protocol |
| 07/05/1994 | US5327497 Preboot protection of unauthorized use of programs and data with a card reader interface |
| 07/05/1994 | CA1330597C Encoding and decoding methods |
| 06/28/1994 | US5325434 Method for authenticating communications participants, system for application of the method and first communications participant and second communication participant for application in the system |
| 06/28/1994 | US5325433 Encryption communication system |
| 06/22/1994 | EP0602335A2 Cryptographic key management apparatus and method |
| 06/21/1994 | US5323464 In a data processing network |
| 06/21/1994 | US5323244 Recording and reproducing apparatus |
| 06/21/1994 | US5323146 Method for authenticating the user of a data station connected to a computer system |
| 06/15/1994 | EP0601907A2 A compact microelectronic device for performing modular multiplication and exponentiation over large numbers |
| 06/14/1994 | US5321755 Information-encrypting device and method |
| 06/09/1994 | WO1994013081A1 Methods and apparatus for uniquely end encrypting data |
| 06/09/1994 | WO1994013080A1 Method and apparatus for improved security within encrypted communication devices |
| 06/09/1994 | WO1994012966A1 Method for secret notation of alphanumerical access codes and device for performing the same |
| 06/08/1994 | EP0600646A2 Secure document and method and apparatus for producing and authenticating same |
| 06/08/1994 | CN2168289Y Coder for note and seal impression |
| 06/07/1994 | US5319705 Method and system for multimedia access control enablement |
| 05/31/1994 | US5317639 Non-linear block substitution devices derived by constructive corruption |
| 05/31/1994 | US5317638 Data processing system |
| 05/26/1994 | WO1994011969A1 Apparatus and method for providing data security in a computer system having a removable memory |
| 05/25/1994 | EP0598036A1 Nonlinear dynamic substitution devices and methods for block substitutions. |
| 05/24/1994 | CA2005391C Communication method and system with encryption of information |
| 05/18/1994 | EP0597481A2 Efficient signature schemes based on birational permutations |
| 05/18/1994 | EP0596945A1 Digital signature algorithm |
| 05/17/1994 | US5313521 Cryptographic communications system |
| 05/11/1994 | WO1994010778A1 Method and apparatus for authentication of client server communication |
| 05/11/1994 | WO1994010660A1 Method and system for writing data onto a medium so as to enable subsequent verification of authenticity |
| 05/11/1994 | CN1086623A Touch-type multi-digit coder |
| 05/10/1994 | US5310999 Secure toll collection system for moving vehicles |
| 05/04/1994 | EP0595720A1 Process and system for recording information on a data carrier enabling to later certify the originality of this information |
| 04/26/1994 | US5307414 Encryption template |
| 04/26/1994 | US5307411 Means for identification and exchange of encryption keys |
| 04/20/1994 | EP0592808A2 Commercial data masking |
| 04/05/1994 | US5301235 Arrangement for transforming plaintext into ciphertext for use in a data communications system |
| 04/05/1994 | US5301233 Process for the transmission and reception of personalized programs |
| 03/30/1994 | EP0589459A1 Recording and reproducing apparatus |
| 03/29/1994 | US5299263 Two-way public key authentication and key agreement for low-cost terminals |
| 03/24/1994 | DE4305960C1 Digital dictation system with protection device against unauthorised listening - contains memory cards with stored codes accessible only by internal comparators controlling access to stored information |
| 03/09/1994 | EP0586022A1 Improved public key/signature cryptosystem with enhanced digital signature certification field |
| 03/05/1994 | CA2077576A1 Encryption template |
| 03/01/1994 | CA2036858C Secure key management using programmable control vector checking |
| 02/02/1994 | EP0581375A1 Method for modifying pseudorandom sequences and apparatus for scrambling or descrambling information |
| 02/01/1994 | US5283422 Information transfer and use, particularly with respect to counterfeit detection |
| 01/25/1994 | US5282247 Apparatus and method for providing data security in a computer system having removable memory |
| 01/12/1994 | CN1080757A Electronic code device |
| 01/06/1994 | WO1993021581A3 Cryptographic data security in a secured computer system |
| 01/05/1994 | EP0577328A2 Secure toll collection system for moving vehicles |
| 01/04/1994 | US5276735 Data enclave and trusted path system |
| 12/28/1993 | US5274466 Encoder including an error decision circuit |
| 12/09/1993 | WO1993024906A1 Protecting programs and data with card reader |
| 12/09/1993 | CA2137274A1 Protecting programs and data with card reader |
| 11/30/1993 | US5267313 File security system |
| 11/24/1993 | EP0570983A1 Hardware encryption apparatus using multiple linear transformations |
| 11/24/1993 | EP0570388A1 Method, identification device and verification device for identification and/or performing digital signature. |
| 11/23/1993 | US5265164 Cryptographic facility environment backup/restore and replication in a public key cryptosystem |
| 11/09/1993 | US5261003 Data communication system and method with data scrambling |
| 11/09/1993 | US5261000 On-line terminal unit |
| 11/03/1993 | EP0567474A1 Method and apparatus for access control and/or identification. |
| 10/28/1993 | WO1993021581A2 Cryptographic data security in a secured computer system |
| 10/28/1993 | CA2118246A1 Data enclave and trusted path system |
| 10/20/1993 | EP0566492A1 Method for authenticating a data processing system from a computer diskette |
| 10/20/1993 | CN1077554A Mutual check anti-fake method of dual direction label coding |
| 10/14/1993 | WO1993020538A1 A cryptographic communications method and system |
| 10/13/1993 | EP0565314A2 Method and apparatus for creating, supporting, and using travelling programs |
| 10/13/1993 | EP0565281A2 Information handling system incorporated with an information security measure |
| 10/12/1993 | US5253297 Data processing system with cryptographic facility |
| 10/05/1993 | US5251258 Key distribution system for distributing a cipher key between two subsystems by one-way communication |
| 09/29/1993 | EP0562468A1 Image forming apparatus with copy guard |
| 09/22/1993 | EP0561685A2 An electronic data protection system |
| 09/21/1993 | US5246375 Memory aiding device |
| 09/21/1993 | CA1322418C Data cryptography operations using control vectors |
| 09/14/1993 | US5245657 Verification method and apparatus |
| 09/14/1993 | US5245655 Method and a device for the protected transmission of data |
| 09/01/1993 | EP0557359A1 Pocketable slide card for recording personal codes. |
| 08/31/1993 | US5241599 Cryptographic protocol for secure communications |
| 08/17/1993 | US5237307 Non-contact tamper sensing by electronic means |
| 08/10/1993 | US5235641 File encryption method and file cryptographic system |
| 08/03/1993 | US5233653 Apparatus and method for enciphered facsimile transmission and reception |
| 07/27/1993 | US5231668 Digital signature algorithm |
| 07/20/1993 | CA1320581C Information transfer and use particularly with respect to objects such as gambling chips |
| 06/30/1993 | EP0482154B1 Device for converting a digital block and the use thereof |
| 06/22/1993 | US5222141 Apparatus and method for encoding data |
| 06/22/1993 | US5222139 Cryptographic method and apparatus |
| 06/16/1993 | EP0546681A1 Information-encrypting and decrypting method |
| 06/15/1993 | CA1319198C Secure management of keys using extended control vectors |
| 06/02/1993 | CN2135179Y Toothed plate |
| 05/25/1993 | US5214704 Nonlinear dynamic substitution devices and methods for block substitutions |
| 05/25/1993 | US5214703 Device for the conversion of a digital block and use of same |
| 05/25/1993 | US5214701 Method of processing data by compression and permutation for microcircuit cards |
| 05/25/1993 | US5214698 Method and apparatus for validating entry of cryptographic keys |
| 05/19/1993 | EP0542703A1 A system for the safe transmission of messages |
| 05/19/1993 | EP0541727A1 Method for secure time-stamping of digital documents |
| 05/18/1993 | CA1318028C System and method for providing for secure encryptor key management |
| 05/11/1993 | CA1317677C Secure management of keys using control vectors |
| 05/08/1993 | CA2081155A1 System for the safe transmission of messages |
| 05/05/1993 | EP0539727A2 Cryptographic facility environment backup/restore and replication in a public key cryptosystem |