Patents
Sitemap › G09 - Educating; Cryptography; Display; Advertising; Seals › G09C - Ciphering or deciphering apparatus for cryptographic or other purposes involving the need for secrecy › 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
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)
01/1988
01/13/1988EP0252850A1 Method for certifying the authenticity of data exchanged between two devices connected locally or remotely by a transmission line
01/13/1988EP0252849A1 Method for authenticating external authorization data by a portable object such as a memory card
01/13/1988EP0252499A2 Method, apparatus and article for identification and signature
01/12/1988CA1231457A1 Method and apparatus to provide security for computer systems
01/05/1988US4718038 Data security device for storing data at a peripheral part of the device during power down thus preventing improper retrieval
12/1987
12/02/1987EP0247703A1 Pseudo-random binary sequence generators
12/01/1987CA1229894A1 Cryptographic analysis system
11/1987
11/25/1987EP0246714A1 Pseudo-random binary sequence generators
11/05/1987WO1987006786A1 Data conversion
11/04/1987EP0243651A2 Personal identification encryption system and method
10/1987
10/22/1987WO1987006372A1 Information transfer and use, particularly with respect to objects such as gambling chips
10/07/1987EP0239749A2 Cryptographic method and processor for carrying out this method
10/06/1987US4698617 ROM Protection scheme
09/1987
09/30/1987EP0238537A1 System for preventing software piracy employing multi-encrypted keys and single decryption circuit modules.
09/15/1987US4694491 Cryptographic system using interchangeable key blocks and selectable key fragments
09/02/1987EP0234100A2 Method and apparatus for synchronizing the generation of separate, free-running, time-dependent codes
08/1987
08/04/1987US4683968 System for preventing software piracy employing multi-encrypted keys and single decryption circuit modules
04/1987
04/14/1987US4658094 Encryption apparatus and methods for raising a large unsigned integer to a large unsigned integer power modulo a large unsigned integer
04/07/1987US4656474 Process and apparatus for authenticating the signature of a signed message
03/1987
03/17/1987CA1219371A1 System for the printing and reading of encrypted messages
03/12/1987WO1987001483A1 System for preventing software piracy employing multi-encrypted keys and single decryption circuit modules
03/11/1987EP0213873A2 Code system and hard lock device for use in the code system
02/1987
02/03/1987US4641346 System for the printing and reading of encrypted messages
01/1987
01/20/1987US4638120 Method and system for transmission of confidential data
12/1986
12/16/1986US4629873 Method and means for producing and analyzing secret identifying code marks in machine-scanned data carriers
11/1986
11/26/1986EP0202989A1 Enciphering apparatus using substitutions and permutations
10/1986
10/29/1986EP0199620A2 Encryption apparatus and methods for raising a large unsigned integer to a large unsigned integer power modulo a large unsigned integer
10/01/1986EP0195779A1 Cryptographic analysis system
09/1986
09/17/1986EP0194769A1 Cryptographic system for a direct broadcast by satellite network
09/02/1986US4610025 Cryptographic analysis system
08/1986
08/06/1986EP0189734A1 Method and apparatus for converting a digital data sequence into an enciphered form
07/1986
07/02/1986EP0185724A1 An encoder/decoder
06/1986
06/17/1986CA1206271A1 Encryption/decryption device for use with rom's
06/11/1986EP0183753A1 Apparatus for the marking of products in connection with a centre instructed to control said marking.
04/1986
04/30/1986EP0179612A2 Cryptographic system for direct broadcast satellite network
03/1986
03/26/1986EP0175359A2 Apparatus for providing security in computer systems
02/1986
02/19/1986EP0171408A1 Pseudo-random binary sequence generators.
02/04/1986US4568822 Apparatus for generating a composite supply
01/1986
01/22/1986EP0168667A2 Secured message transfer system and method using updated session code
01/16/1986WO1986000445A1 Cryptographic analysis system
01/03/1986WO1986000162A1 An encoder/decoder
12/1985
12/19/1985WO1985005714A1 Method for the marking of products in connection with a centre instructed to control said marking
11/1985
11/27/1985EP0162707A2 ROM protection scheme
11/26/1985US4555591 Integrated circuit devices for secure data encryption
09/1985
09/11/1985EP0154252A2 Programmable read only memory device and memory system employing the same
08/1985
08/21/1985EP0152251A2 Broadcasting system
08/15/1985WO1985003604A1 Pseudo-random binary sequence generators
05/1985
05/29/1985EP0142892A1 Method for manufacturing an information slide or information disc
05/21/1985CA1187611A1 Authorization card
04/1985
04/24/1985EP0138386A2 Identification card
02/1985
02/19/1985US4500750 System for providing data communication
09/1984
09/26/1984EP0119707A1 Automatic verification
09/11/1984US4471164 Stream cipher operation using public key cryptosystem
08/1984
08/28/1984CA1173538A1 Rsa public-key data encryption system
08/01/1984EP0114522A2 ROM protection device
04/1984
04/18/1984EP0105553A1 Device for enciphering digital signals comprising one or more DES circuits
04/11/1984EP0105241A2 Computer system for preventing copying of program
04/03/1984US4441095 Code translator
03/1984
03/07/1984EP0101711A1 A portable device for storing and transferring data
02/1984
02/21/1984US4432567 Authorization card
01/1984
01/03/1984US4424414 Exponentiation cryptographic apparatus and method
12/1983
12/27/1983US4423287 End-to-end encryption system and method of operation
12/27/1983CA1159566A1 Method and means for producing and analysing secret identifying code marks in machine-scanned data carriers
12/20/1983CA1159123A1 Method and device for coding and/or decoding and securing data
11/1983
11/23/1983EP0094460A1 Recording information
09/1983
09/01/1983WO1983003018A1 A portable device for storing and transferring data
07/1983
07/06/1983EP0083209A2 A microcomputer for processing instructions of different types
07/06/1983EP0082958A2 Cryptographic data communications
07/05/1983CA1149483A1 Cryptographic communication and file security using terminals
06/1983
06/15/1983EP0011615B1 Method and device for encryption and decryption of data
06/07/1983CA1147863A1 Method and apparatus for secure message transmission for use in electronic funds transfer systems
05/1983
05/31/1983US4386234 Cryptographic communication and file security using terminals
04/1983
04/20/1983EP0077238A1 Method and apparatus for authenticating the signature of a message
02/1983
02/08/1983CA1141001A1 Method and means for securing the distribution of encoding keys
01/1983
01/18/1983US4369434 Enciphering/deciphering system
01/18/1983US4369333 Method and apparatus for enciphering and deciphering of information
01/05/1983EP0068805A1 End-to-end encryption system and method of operation
10/1982
10/28/1982WO1982003717A1 Ciphering electronic circuit/mechanical-spatial combinative toy
10/05/1982CA1133087A1 Code translator
09/1982
09/28/1982US4351982 RSA Public-key data encryption system having large random prime number generating microprocessor or the like
07/1982
07/20/1982CA1128159A1 Public key cryptographic apparatus and method
07/13/1982US4339820 Method and device for coding and/or decoding and securing data
07/06/1982CA1127258A1 Method and apparatus for enciphering blocks which succeed short blocks in a key-controlled block-cipher cryptographic system
06/1982
06/24/1982WO1982002129A1 Rsa public-key data encryption system having large random prime number generating microprocessor or the like
06/01/1982US4333073 Electromechanical decoder
06/01/1982CA1124812A1 Cryptographic communication security for multiple domain networks
06/01/1982CA1124811A1 Cryptographic file security for single domain networks
06/01/1982CA1124810A1 Cryptographic communication security for single domain networks
05/1982
05/25/1982US4331845 Output switch assembly and operating mechanism
03/1982
03/30/1982US4322577 Cryptosystem
03/09/1982US4319223 Full code means for electromechanical decoder
11/1981
11/24/1981US4302810 Method and apparatus for secure message transmission for use in electronic funds transfer systems
09/1981
09/09/1981EP0035448A1 Method and system for transmitting confidential information
09/08/1981US4288659 Method and means for securing the distribution of encoding keys
09/02/1981EP0034755A1 Authentification card
07/1981
07/28/1981US4281215 Method and apparatus for securing data transmissions
07/22/1981EP0032193A1 Communication apparatus
07/15/1981EP0032107A1 Enciphering and deciphering system
06/1981
06/30/1981CA1104256A1 Identity verification method and apparatus
06/17/1981EP0030381A2 Process and apparatus for the manufacture of documents protected against counterfeiting and misuse, and document used therein
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