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)
06/1990
06/26/1990US4937574 Data conversion
06/23/1990CA2006458A1 Method for scrambling pal, secam and ntsc composite video signals and decoder for unscrambling said signals
06/20/1990EP0374028A1 Method and communication system with information enciphering
06/13/1990EP0171408B1 Pseudo-random binary sequence generators
06/12/1990US4933971 Method for encrypting transmitted data using a unique key
06/12/1990US4933970 Variants of the fiat-shamir identification and signature scheme
06/12/1990US4933969 Data authentication and protection system
06/06/1990EP0371787A2 Decryption device
06/05/1990US4932056 Method and apparatus for user identification based on permuted kernels
05/1990
05/23/1990CN1008142B Cryptographic system
05/15/1990US4926480 Card-computer moderated systems
05/09/1990EP0367700A2 A method of verifying receipt and acceptance of electronically delivered data objects
05/02/1990EP0365930A2 Random number generator circuit
03/1990
03/28/1990CN1040893A Cordless telephone
03/08/1990WO1990002394A1 Form and procedure for selecting a code to be kept secret
03/06/1990US4907275 Encryption apparatus
03/06/1990US4907272 Method for authenticating an external authorizing datum by a portable object, such as a memory card
03/06/1990US4907270 Method for certifying the authenticity of a datum exchanged between two devices connected locally or remotely by a transmission line
02/1990
02/27/1990US4905277 Method for enciphering and deciphering instructions in a microcomputer, and a microcomputer used for effecting same
02/27/1990US4905176 Random number generator circuit
02/20/1990CA1266096A1 Fully programmable linear feedback shift register
01/1990
01/30/1990US4897876 Method of and an arrangement for digital signal encryption
01/30/1990CA1265109A1 Encoder/decoder
01/25/1990WO1990000843A1 Cordless telephone
01/17/1990EP0351102A2 Encryption apparatus
01/09/1990US4893338 System for conveying information for the reliable authentification of a plurality of documents
12/1989
12/28/1989WO1989012863A1 System and method for the secure handling of encryptor keys
12/19/1989US4888802 System and method for providing for secure encryptor key management
12/19/1989US4888800 Secure messaging systems
12/05/1989US4885779 Personal identification encryptor system with error-correcting code and method
12/05/1989US4885778 Method and apparatus for synchronizing generation of separate, free running, time dependent equipment
11/1989
11/30/1989WO1989011762A1 Card-computer moderated systems
11/30/1989WO1989011706A1 Method and device for authentication
11/30/1989DE3915262A1 Method for generating authenticated secret codes
11/29/1989EP0343805A2 Reproduction of secure keys by using distributed key generation data
11/23/1989EP0342832A2 Dynamic feedback arrangement scrambling technique keystream generator
11/23/1989EP0183753B1 Apparatus for the marking of products in connection with a centre instructed to control said marking
11/08/1989EP0340633A2 Encoding and decoding method and apparatus
11/07/1989US4879747 Method and system for personal identification
11/02/1989DE3911842A1 Diagram disc for patient guidance and monitoring
10/1989
10/31/1989CA1262575A1 System for preventing software piracy employing multi- encrypted keys and single decryption circuit modules
09/1989
09/27/1989EP0334616A2 Method and system for personal identification
09/27/1989EP0334503A2 Data-processing apparatus and method
09/26/1989US4870683 Personal identification encryptor system and method
09/26/1989US4870681 Cryptographic method and cryptographic processor for carrying out the method
09/21/1989WO1989008957A1 One-show blind signature systems
09/05/1989US4864615 Reproduction of secure keys by using distributed key generation data
08/1989
08/22/1989US4860353 Dynamic feedback arrangement scrambling technique keystream generator
08/10/1989DE3824311A1 Method for coding and decoding a signal and device for carrying out said method
08/01/1989US4853961 Reliable document authentication system
07/1989
07/26/1989EP0325238A2 Improved variants of the Fiat-Shamir identification and signature scheme
07/18/1989US4850017 Controlled use of cryptographic keys via generating station established control values
06/1989
06/13/1989CA1255769A1 Secured message transfer system and method using updated session code
05/1989
05/31/1989EP0318097A1 Undeniable signature systems
05/30/1989US4835682 Computer system for preventing copying of program from a storage medium by modifying the program using a unique key
05/18/1989WO1989004570A1 Personal identification encryptor system with error-correcting code and method
04/1989
04/20/1989WO1989003557A1 Self-correcting registers, error-detecting/correcting registers, and inversion coding using one bit, and other information storage media
04/18/1989US4822985 Transaction approval system
04/12/1989EP0311470A1 Methods and systems to authenticate authorizations and messages with a zero knowledge-proof system and to provide messages with a signature
04/11/1989US4820910 Security system and lock
03/1989
03/21/1989US4814589 Information transfer and use, particularly with respect to objects such as gambling chips
03/07/1989US4811393 Method and system for diversification of a basic key and for authentication of a thus-diversified key
01/1989
01/10/1989US4797922 Method of, and apparatus for, transforming a digital data sequence into an encoded form
11/1988
11/30/1988EP0292943A2 Digital input/output circuit capable of sending and receiving data in different modes
11/30/1988EP0292790A2 Controlling the use of cryptographic keys via generating station established control values
11/22/1988US4786941 Method of protection of confidential documents
11/17/1988EP0290589A1 Fully programmable linear feedback shift register
11/15/1988CA1244949A1 Cyphering device using substitutions and permutations
11/02/1988EP0289086A2 A method of and arrangement for digital signal encryption
11/01/1988CA1244090A1 Cryptographic system for direct broadcast satellite network
10/1988
10/04/1988US4776011 Recursive key schedule cryptographic system
09/1988
09/21/1988EP0283432A1 Method and apparatus for protecting secret elements in a cryptographic devices network with open key management
09/14/1988EP0282123A1 System and method for cryptography, including application
09/13/1988US4771461 Initialization of cryptographic variables in an EFT/POS network with a large number of terminals
09/07/1988EP0281225A2 Secure information storage
09/07/1988EP0281224A2 Secure messaging systems
08/1988
08/31/1988EP0280035A2 Method for the programme securing and for integrity checking of a secured programme
08/24/1988CN87107370A Cryptographic system
08/17/1988EP0278170A2 Cipher system
08/10/1988EP0277186A1 Data encipherment
08/02/1988CA1240053A1 Marking process of products in relationship with an organization responsible for the control of said marking
07/1988
07/27/1988EP0275578A1 Device for setting, at choice, one or more bar codes each representing a data character or a symbol
07/26/1988US4760600 Cipher system
07/13/1988EP0274191A2 Transaction approval system
07/12/1988US4757187 Method for marking products in relation with an organization which is commissioned to check this marking
06/1988
06/14/1988US4751733 Substitution permutation enciphering device
06/02/1988WO1988004097A1 Fully programmable linear feedback shift register
05/1988
05/31/1988US4748668 Method, apparatus and article for identification and signature
05/31/1988US4748576 Pseudo-random binary sequence generators
05/17/1988CA1236885A1 Broadcasting system
05/04/1988EP0265497A1 Information transfer and use, particularly with respect to objects such as gambling chips
05/04/1988EP0265477A1 Data conversion.
04/1988
04/05/1988CA1234920A1 Rom protection scheme
03/1988
03/29/1988US4734921 Fully programmable linear feedback shift register
02/1988
02/11/1988WO1988001119A1 Data encipherment
02/03/1988EP0254812A2 Cryptovariable initialisation in a public key network
01/1988
01/28/1988WO1988000744A1 Process for diversifying a basic key and for authenticating a thus diversified key as having been prepared from a predetermined basic key, and system for its implementation
01/28/1988WO1988000743A1 Process for authenticating external clearance data by a portable object such as a memory card
01/28/1988WO1988000742A1 Process for certifying the authenticity of data exchanged between two devices locally or remotely connected by a transmission line
01/20/1988EP0253722A1 Method for diversifying a basic key and for authenticating a key worked out from a predetermined basic key and system for operation
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