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)
08/1982
08/10/1982US4343967 Autokey code generator
08/10/1982CA1129554A1 System for securing postage printing transactions
07/1982
07/27/1982US4341925 Random digital encryption secure communication system
07/22/1982WO1982002446A1 Security method and device for three-party communication of confidential data
07/20/1982CA1128159A1 Public key cryptographic apparatus and method
07/14/1982EP0055986A2 Security system and apparatus for the three-way communication of confidential data
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
06/01/1982USRE30957 Variant key matrix cipher system
06/01/1982US4332977 Teletypewriter privacy system
06/01/1982CA1124864A1 Cryptographic architecture for use with a high security personal identification system
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
05/11/1982US4329545 Circuit arrangement for the control of semi-duplex data transmission system
04/1982
04/20/1982US4326098 High security system for electronic signature verification
04/07/1982EP0048903A1 Security system for preventing unauthorized manipulations during electronic text transmission in data networks
04/06/1982US4323729 Circuit arrangement for the control of a crypto operation in the case of procedure-controlled semi-duplex data transmission systems
03/1982
03/30/1982US4322577 Cryptosystem
03/30/1982US4322576 Message format for secure communication over data links
03/30/1982CA1121014A1 Method and apparatus for transaction and identity verification
03/30/1982CA1121013A1 Cryptographic file security for multiple domain networks
03/17/1982EP0047285A1 A system for authenticating users and devices in on-line transaction networks.
03/02/1982US4318125 Solid state digital audio scrambler system for teletransmission of audio intelligence through a television system
03/02/1982US4317957 System for authenticating users and devices in on-line transaction networks
03/02/1982CA1119268A1 Cryptographic verification of operational keys used in communication networks
02/1982
02/23/1982CA1118896A1 Security system for remote cash dispensers
02/16/1982US4316055 Stream/block cipher crytographic system
02/09/1982US4315101 Method and apparatus for securing data transmissions
02/02/1982US4314097 Authenticator device for precluding compensating text modifications in transmitted messages
01/1982
01/26/1982US4313031 Encipher-decipher device having semi-automatic generation of the code key during data entry
01/12/1982US4310720 Computer accessing system
01/06/1982EP0043027A1 Electronic signature verification method and system
01/05/1982US4309569 Method of providing digital signatures
12/1981
12/15/1981US4306111 Simple and effective public-key cryptosystem
12/10/1981WO1981003560A1 Data compression,encryption,and in-line transmission system
12/08/1981US4305152 Security communication system
12/08/1981US4304961 Authenticator code generator
11/1981
11/25/1981EP0040198A1 Computer system
11/24/1981US4302810 Method and apparatus for secure message transmission for use in electronic funds transfer systems
11/17/1981US4301327 Reduction of message redundancy by multiple substitution: a message preprocessing scheme for secure communications
11/04/1981EP0038875A1 Process and circuit for data eneryption
10/1981
10/27/1981CA1111563A1 Method for authenticating the identity of a user of an information system
10/14/1981EP0037762A1 Method and system for transmitting signed messages
09/1981
09/17/1981WO1981002655A1 A system for authenticating users and devices in on-line transaction networks
09/09/1981EP0035448A1 Method and system for transmitting confidential information
09/09/1981EP0035048A1 Cipher system using a variant key matrix
09/08/1981US4288659 Method and means for securing the distribution of encoding keys
08/1981
08/27/1981EP0027137A4 Apparatus for enciphering and/or deciphering data signals.
08/19/1981EP0033833A2 Transaction execution system, method of operating such a system and terminal for use in such a system
08/11/1981US4283599 Method and apparatus for securing data transmissions
08/11/1981CA1106930A1 Apparatus for the transmission end-enciphering and reception end-deciphering of information
08/05/1981EP0033014A1 System for enciphering and deciphering data
07/1981
07/28/1981US4281216 Key management for encryption/decryption systems
07/28/1981US4281215 Method and apparatus for securing data transmissions
07/22/1981EP0032193A1 Communication apparatus
07/15/1981EP0032107A1 Enciphering and deciphering system
07/09/1981WO1981001933A1 Message format for secure communication over data links
06/1981
06/23/1981US4275265 Complete substitution permutation enciphering and deciphering circuit
06/16/1981US4274085 Flexible mode DES system
06/16/1981CA1103358A1 Digital signature system and apparatus
06/03/1981EP0029444A1 Data transmission system
06/02/1981CA1102453A1 Computer accessing system
06/02/1981CA1102421A1 Security controlled information exchange system
05/1981
05/19/1981US4268715 Method and apparatus for securing data transmissions
05/19/1981CA1101509A1 Machine enciphering and deciphering
05/13/1981EP0028273A1 Method and device for generating secret keys
05/13/1981EP0028272A1 Method and device for the transmission of enciphered information
05/06/1981EP0027853A1 Data enciphering and deciphering method
05/05/1981CA1100593A1 Programmable security system and method
05/05/1981CA1100588A1 Message verification and transmission error detection by block chaining
04/1981
04/29/1981EP0027572A1 Method and apparatus for ciphered transmission of information
04/28/1981US4264782 Method and apparatus for transaction and identity verification
04/28/1981US4264781 Apparatus for encoding and decoding data signals
04/22/1981EP0027423A1 Digital-signal ciphering and deciphering arrangement
04/22/1981EP0027137A1 Apparatus for enciphering and/or deciphering data signals.
04/16/1981WO1981001063A1 Computer system
04/15/1981EP0027058A1 Computer system
04/14/1981US4262359 Five V insertion unit
04/14/1981US4262358 DES Parity check system
04/08/1981EP0026458A2 Method of synchronizing key devices operating in a packet-switched network
03/1981
03/31/1981US4259720 Security system for electronic funds transfer system
03/10/1981US4255811 Key controlled block cipher cryptographic system
03/04/1981EP0024308A1 Method and apparatus for enciphering and deciphering information
02/1981
02/24/1981US4253158 System for securing postage printing transactions
02/03/1981US4249180 Past dependent microcomputer cipher apparatus
01/1981
01/28/1981EP0023074A1 Data encryption/decryption system and method for generating a key word for such a system
01/28/1981EP0022986A1 Method of enciphered data transmission in half-duplex operation between data terminal equipments of two data stations
01/20/1981US4246442 Method and device for confirming correct connection between data terminals in data communication system using telephone network
01/07/1981EP0022069A1 Apparatus for enciphered transmission of messages
01/07/1981EP0021401A1 A method and apparatus for transaction and identity verification
01/07/1981EP0021387A1 Apparatus for supplying written information to a body of persons authorized to receive it
12/1980
12/11/1980WO1980002756A1 Data transmission system
12/10/1980EP0019756A1 Process for verifying the synchronism between two cryptographic devices
12/09/1980US4238854 Cryptographic file security for single domain networks
12/09/1980US4238853 Cryptographic communication security for single domain networks
11/1980
11/18/1980US4234932 Security system for remote cash dispensers
11/12/1980EP0018784A1 Communication system with digital audio scrambler and unscrambler subsystems for transmission of audio intelligence through a television system
11/04/1980US4232187 Teletype character modification unit
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