| 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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| 06/16/1981 | CA1103358A1 Digital signature system and apparatus |
| 05/19/1981 | CA1101509A1 Machine enciphering and deciphering |
| 05/05/1981 | CA1100593A1 Programmable security system and method |
| 05/05/1981 | CA1100588A1 Message verification and transmission error detection by block chaining |
| 04/29/1981 | EP0027572A1 Method and apparatus for ciphered transmission of information |
| 03/04/1981 | EP0024308A1 Method and apparatus for enciphering and deciphering information |
| 12/09/1980 | US4238854 Cryptographic file security for single domain networks |
| 12/09/1980 | US4238853 Cryptographic communication security for single domain networks |
| 10/21/1980 | US4229818 Method and apparatus for enciphering blocks which succeed short blocks in a key-controlled block-cipher cryptographic system |
| 10/21/1980 | US4229817 Portable electronic cryptographic device |
| 10/07/1980 | US4227253 Cryptographic communication security for multiple domain networks |
| 08/19/1980 | US4218582 Public key cryptographic apparatus and method |
| 07/15/1980 | CA1081852A1 Electronic enciphering-and deciphering apparatus in the form of a pocket calculator |
| 07/09/1980 | EP0012974A1 Method for enciphering data blocks of a given length |
| 06/03/1980 | US4206315 Digital signature system and apparatus |
| 05/13/1980 | US4202626 Signature verification and authentication systems |
| 02/05/1980 | US4187393 Key generator |
| 01/09/1980 | EP0006419A1 Signature verification and authentication system |
| 07/31/1979 | CA1059630A1 Transaction execution system with secure data storage and communications |
| 07/12/1979 | WO1979000418A1 Method and device for encryption and decryption |
| 06/27/1979 | EP0002579A1 A method of creating a secure data file |
| 06/27/1979 | EP0002578A1 Data communication method |
| 06/27/1979 | EP0002478A1 Cryptographic apparatus |
| 06/13/1979 | EP0002389A1 Multiple domain data communication |
| 06/13/1979 | EP0002388A1 Data processing terminal |
| 06/05/1979 | US4157454 Method and system for machine enciphering and deciphering |
| 05/29/1979 | US4156314 Rotors for a ciphering machine |
| 05/15/1979 | US4154006 Coding and decoding machine |
| 03/13/1979 | US4143978 Electro-mechanical cipher machine |
| 02/27/1979 | US4141659 Bowden wire substitute mechanism |
| 02/20/1979 | CA1048935A1 Block cipher system for data security |
| 01/30/1979 | CA1047407A1 Programmable cryptic device for enciphering and deciphering data |
| 01/23/1979 | CA1046942A1 Product block cipher system for data security |
| 11/07/1978 | US4124311 Mechanical movements for coding machines |
| 10/31/1978 | US4123747 Identity verification method and apparatus |
| 06/13/1978 | US4095046 Electronic enciphering- and deciphering apparatus in the form of a pocket calculator |
| 02/14/1978 | US4074066 Message verification and transmission error detection by block chaining |
| 12/27/1977 | US4065752 Check digit generation and verification apparatus |
| 01/18/1977 | US4004089 Programmable cryptic device for enciphering and deciphering data |
| 11/02/1976 | US3990060 Cryptographic magnetic bubble domain memory |
| 10/12/1976 | US3984922 Rotors |
| 06/08/1976 | US3962539 Product block cipher system for data security |
| 05/18/1976 | US3958081 Block cipher system for data security |
| 05/11/1976 | US3956615 Transaction execution system with secure data storage and communications |