Patents
Sitemap › H04 - Electric communication technique › H04L - Transmission of digital information, e.g. telegraphic communication › H04L 9 - Arrangements for secret or secure communication
Patents for H04L 9 - Arrangements for secret or secure communication (111,914)
08/1987
08/04/1987US4683968 System for preventing software piracy employing multi-encrypted keys and single decryption circuit modules
07/1987
07/29/1987EP0230327A2 Teletext transmission systems
07/15/1987EP0228830A2 Communications network
07/15/1987EP0228455A1 Scrambling apparatus
07/08/1987EP0228108A2 Receiving scrambled signals
07/07/1987CA1223990A1 Portable telephone id code transfer system
07/07/1987CA1223932A1 Cryptographic transmission system
07/01/1987EP0227318A2 Encryption/decryption system
07/01/1987EP0227072A2 Data transmission security arrangement for a plurality of data stations sharing access to a communication network
06/1987
06/30/1987US4677670 Paired-secure message identification controller for computers and the like
06/24/1987EP0225959A1 Method and apparatus for encrypting and decrypting communications between a user and a computer over the telephone network, in vocal form in the direction computer to user and in frequency-coded form in the direction user to computer
06/23/1987US4675477 Electronic device providing automatic permutations of a Vigenere Square
06/16/1987EP0225756A2 Method of secured communications in a telecommunications system
06/16/1987CA1223075A1 Personal identification system
06/04/1987WO1987003442A1 Method and apparatus for synchronizing encrypting and decrypting systems
05/1987
05/27/1987EP0223122A2 Secure component authentication system
05/27/1987EP0222818A1 Method and apparatus for scrambling and descrambling television signals
05/26/1987US4668103 Polygraphic encryption-decryption communications system
05/26/1987CA1222296A1 User authentication system
05/21/1987DE3540173A1 Method for generating basic keys for the encrypted transmission of information
05/13/1987EP0221589A1 Device for establishing a connection between a telecommunication network and a controllable system, such as a computer system, provided with an access control unit controllable via a separate network terminal
05/13/1987EP0221558A2 Data converter
05/13/1987EP0221538A2 Data randomization equipment and method
05/12/1987US4665396 Validation check for remote digital station
05/06/1987EP0220437A1 Generator for producing binary cipher sequences
05/05/1987US4663500 Cryptographic system
04/1987
04/28/1987US4661991 Circuit arrangement for preventing unauthorized access to a communication system which is protected by a subscriber-specific password
04/28/1987US4661980 Intercept resistant data transmission system
04/28/1987US4661658 Offline PIN validation with DES
04/28/1987US4661657 Method and apparatus for transmitting and receiving encoded data
04/15/1987EP0218305A1 Blind Unanticipated signature systems
04/14/1987US4658292 Enciphering key distribution system for subscription TV broadcast or catv system
04/14/1987US4658094 Encryption apparatus and methods for raising a large unsigned integer to a large unsigned integer power modulo a large unsigned integer
04/14/1987US4658093 Software distribution system
04/14/1987CA1220536A1 Method of distributing and utilizing enciphering keys
04/07/1987US4656474 Process and apparatus for authenticating the signature of a signed message
04/02/1987DE3534416A1 Method for protecting data transmissions
03/1987
03/31/1987US4654480 Method and apparatus for synchronizing encrypting and decrypting systems
03/26/1987WO1987001840A1 Data processing system for a financial environment
03/24/1987US4652698 Method and system for providing system security in a remote terminal environment
03/18/1987EP0214609A2 Electronic transaction method and system
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
03/11/1987EP0213682A2 Method of, and apparatus for data communication
03/10/1987US4649233 Method for establishing user authenication with composite session keys among cryptographically communicating nodes
03/05/1987DE3530760A1 Encryption of digitised information
03/03/1987CA1218720A1 Common control audio decryptor
02/1987
02/24/1987US4645871 Non-interfering in-band protocol-independent diagnostic scanning in a digital multipoint communication system
02/10/1987US4642424 Cryptographic transmission system
02/03/1987US4641346 System for the printing and reading of encrypted messages
01/1987
01/21/1987EP0209079A2 Method for making an enciphered radio communication
01/20/1987US4638120 Method and system for transmission of confidential data
01/15/1987WO1987000377A1 Scrambling apparatus
01/14/1987EP0208238A2 High speed residue calculating apparatus
01/13/1987US4636583 Synchronization of long codes of bounded time uncertainty
01/07/1987EP0207534A1 System for storing and distributing keys for cryptographically protected communication
01/06/1987US4634808 Descrambler subscriber key production system utilizing key seeds stored in descrambler
12/1986
12/30/1986US4633037 Generation of identification keys
12/30/1986US4633036 Method and apparatus for use in public-key data encryption system
12/30/1986EP0206821A2 Data transmission system
12/30/1986EP0206319A2 Data encoding/decoding circuit
12/17/1986EP0205095A2 Method and arrangement for protecting the access to a computer
12/16/1986US4630201 On-line and off-line transaction security system using a code generated from a transaction parameter and a random number
12/16/1986US4629874 Prepayment metering system
12/04/1986WO1986007225A1 Restoring framing in a communications system
12/04/1986WO1986007224A1 Method and apparatus for scrambling and descrambling television signals
12/03/1986EP0203853A2 Satellite communication system and method with message authentication suitable for use in financial institutions
12/03/1986EP0203424A2 Method and circuit arrangement for verifying the authorization to gain access to a signal-processing system
12/03/1986CN86103445A Restoring framing in a communications system
12/02/1986US4627074 Method and arrangement for transmitting characters
12/02/1986CA1214865A1 Catv communications system
11/1986
11/26/1986EP0202989A1 Enciphering apparatus using substitutions and permutations
11/26/1986EP0202768A2 Technique for reducing RSA crypto variable storage
11/26/1986EP0202248A1 Communication system
11/25/1986US4625076 Signed document transmission system
11/19/1986CN86103053A Method and apparatus for scrambling and descrambling television signals
11/05/1986EP0200704A2 Bootstrap channel security arrangement for communication network
11/05/1986EP0200310A2 Direct broadcast satellite signal transmission system
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
10/29/1986EP0199161A2 Method for bitwise encrypted transmission
10/15/1986EP0197392A2 Improvements in cryptographic communication
10/08/1986EP0111489B1 Encryption system key distribution method and apparatus
09/1986
09/17/1986EP0194839A2 Communications network using IC cards
09/17/1986EP0194782A2 Telecommunications security device
09/17/1986EP0194769A1 Cryptographic system for a direct broadcast by satellite network
09/16/1986US4612627 Digital signal composing circuit for cross-fade signal processing
09/16/1986US4612413 Authentication system between a card reader and a pay card exchanging data
09/16/1986CA1211521A1 Cryptographic system
08/1986
08/27/1986EP0112844B1 Method and apparatus for encrypted radio communications
08/26/1986US4608455 Processing of encrypted voice signals
08/20/1986EP0191684A1 Method for distributing data by an organism to one or a plurality of receivers, and system for carrying out this method
08/20/1986EP0191324A2 Offline pin cryptographic validation
08/20/1986EP0191162A2 Method of software protection
08/19/1986US4607137 Method of distributing and utilizing enciphering keys
08/12/1986CA1209704A1 Generator of encoding or decoding 8-bit bytes which can be used in a videography system
08/12/1986CA1209664A1 Broadcasting encrypted signals
08/06/1986EP0189823A2 Method for transmitting digital information
08/06/1986EP0189734A1 Method and apparatus for converting a digital data sequence into an enciphered form
08/06/1986EP0189476A1 Security system and method for remote terminal network.
07/1986
07/30/1986CN86100623A Method of diffusing data by an organism to one or several addresses and system for carrying out said method
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