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)
11/1980
11/04/1980US4232186 Method of and means for generating complex electrical coding waves for secret communications
10/1980
10/30/1980WO1980002349A1 Apparatus for enciphering and/or deciphering data signals
10/29/1980EP0018129A1 Method of providing security of data on a communication path
10/29/1980EP0018081A1 Method and system for securing postage printing transactions
10/21/1980US4229818 Method and apparatus for enciphering blocks which succeed short blocks in a key-controlled block-cipher cryptographic system
10/21/1980US4229817 Portable electronic cryptographic device
10/14/1980CA1087749A1 Confidential mail processing system
10/14/1980CA1087734A1 Cash dispensing system
10/07/1980US4227253 Cryptographic communication security for multiple domain networks
09/1980
09/30/1980US4225962 Mosaic printer
09/30/1980US4225935 Coding method and system with enhanced security
09/23/1980US4224666 Data processing system which protects the secrecy of confidential data
09/17/1980EP0015534A1 System for ciphered transmission of data
09/16/1980US4223403 Cryptographic architecture for use with a high security personal identification system
08/1980
08/19/1980US4218738 Method for authenticating the identity of a user of an information system
08/19/1980US4218582 Public key cryptographic apparatus and method
07/1980
07/29/1980US4215421 Data-processing system which protects the secrecy of confidential data
07/09/1980EP0012974A1 Method for enciphering data blocks of a given length
07/08/1980US4211891 Method for setting code text generators in ciphering devices
06/1980
06/17/1980US4208739 Integrated encryption and channel coding technique
06/17/1980US4208545 Secrecy system
06/17/1980US4208544 Checker and automatic synchronizer for coding equipment
06/03/1980US4206315 Digital signature system and apparatus
05/1980
05/20/1980US4204088 Means for establishing various communication conditions in a cryptographic system
05/14/1980EP0011050A1 Enciphering and deciphering apparatus
05/13/1980US4203166 Cryptographic file security for multiple domain networks
05/13/1980US4202626 Signature verification and authentication systems
05/06/1980US4202051 Digital data enciphering and deciphering circuit and method
04/1980
04/29/1980US4200770 Cryptographic apparatus and method
04/29/1980CA1076676A1 Enciphering-and deciphering apparatus in the form of a typewriter
03/1980
03/25/1980US4195200 Key controlled block-cipher cryptographic system employing a multidirectional shift matrix
03/25/1980US4195196 Variant key matrix cipher system
03/11/1980US4193131 Cryptographic verification of operational keys used in communication networks
03/11/1980US4192967 Teletype mixer apparatus for coding and decoding
02/1980
02/05/1980US4187392 Synchronous universal binary scrambler
01/1980
01/23/1980EP0007002A1 Transaction terminal systems provided with potential user authentication
01/22/1980US4185166 Multi-mode digital enciphering system
01/09/1980EP0006419A1 Signature verification and authentication system
01/08/1980US4182929 Circuit for simulating the scrambling of an electromechanical rotor
01/01/1980US4181816 Devices for combining random sequences, using one or more switching operations
12/1979
12/18/1979US4179663 Devices for generating pseudo-random sequences
12/11/1979US4178474 Signaling system
12/04/1979US4177355 Array device for data scrambling
11/1979
11/27/1979US4176399 Analog noise generator
11/27/1979US4176247 Signal scrambler-unscrambler for binary coded transmission system
11/27/1979US4176246 Apparatus for the transmission end-enciphering and reception end-deciphering of information
11/14/1979EP0005179A2 Authenticating the identity of a user of an information system
10/1979
10/23/1979US4172213 Byte stream selective encryption/decryption device
10/09/1979US4170714 Digital cryptographic system and testing thereof
09/1979
09/25/1979US4169212 Multi-mode digital enciphering system
09/18/1979US4168395 Start/stop teleprinter scrambler
09/04/1979US4166922 Multi-mode digital enciphering system with repeated priming sequences
08/1979
08/28/1979CA1061483A1 Alignment of bytes in a digital data bit stream
08/21/1979US4165444 Apparatus for electronic encypherment of digital data
08/07/1979US4163870 Circuit for producing a pulse succession
07/1979
07/31/1979US4162762 Data processing machine, especially ciphering equipment
07/31/1979CA1059630A1 Transaction execution system with secure data storage and communications
07/24/1979US4162483 Bilateral master station-plural satellite station signalling apparatus
07/12/1979WO1979000418A1 Method and device for encryption and decryption
07/03/1979US4160123 Methods of and apparatus for the encoded transmission of information
07/03/1979US4160120 Link encryption device
06/1979
06/27/1979EP0002580A1 A process for the verification of cryptographic operational keys used in data communication networks
06/27/1979EP0002579A1 A method of creating a secure data file
06/27/1979EP0002578A1 Data communication method
06/27/1979EP0002478A1 Cryptographic apparatus
06/26/1979US4159468 Communications line authentication device
06/13/1979EP0002390A1 Method for cryptographic file security in multiple domain data processing systems
06/13/1979EP0002389A1 Multiple domain data communication
06/13/1979EP0002388A1 Data processing terminal
06/05/1979US4157454 Method and system for machine enciphering and deciphering
06/05/1979US4157453 Cryptographic telegram transmission system
05/1979
05/22/1979US4156108 Pulse producing system for secrecy transmissions
05/08/1979CA1054067A1 Method and apparatus for synchronizing a receiver end-key generator with a transmitter end-key generator
05/08/1979CA1054066A1 Method and apparatus for the synchronization of a deciphering device functioning as receiver with an enciphering device functioning as transmitter
03/1979
03/27/1979CA1051552A1 Code calculator for validating banking transactions_
03/20/1979US4145569 Method and apparatus for synchronizing the ciphering and deciphering of binary-coded messages
03/20/1979US4145568 Method and apparatus for ciphering and deciphering messages
02/1979
02/20/1979US4140873 Multi-mode digital enciphering system
02/20/1979CA1049149A1 Circuit for producing a pulse train
02/20/1979CA1048935A1 Block cipher system for data security
01/1979
01/30/1979CA1047407A1 Programmable cryptic device for enciphering and deciphering data
01/23/1979CA1046942A1 Product block cipher system for data security
01/16/1979CA1046669A1 Spread spectrum communication techniques for a code division message multiplexing system
01/09/1979US4133974 System for locally enciphering prime data
01/09/1979US4133973 Digital cryptographic system having synchronous and asynchronous capabilities
09/1978
09/19/1978US4115657 Random digital code generator
09/12/1978US4114139 Security controlled information exchange system
08/1978
08/15/1978US4107458 Cipher computer and cryptographic system
07/1978
07/25/1978US4102493 Systems for storing and transferring data
05/1978
05/23/1978US4091423 Synchronous digital data scrambling system
05/02/1978US4087626 Scrambler and unscrambler for serial data
03/1978
03/14/1978US4079195 Method and apparatus for the synchronization of a deciphering device functioning as a receiver with an enciphering device functioning as transmitter
03/14/1978US4079188 Multi-mode digital enciphering system
03/07/1978US4078152 Block-cipher cryptographic system with chaining
02/1978
02/21/1978US4075460 Cash dispensing system
02/14/1978US4074066 Message verification and transmission error detection by block chaining
01/1978
01/31/1978US4071693 Method and apparatus for synchronizing a receiver end-key generator with a transmitter end-key generator
01/10/1978US4068089 Data indicator unit
11/1977
11/15/1977US4058673 Arrangement for ciphering and deciphering of information
09/1977
09/06/1977US4047008 Pseudo-random number sequence generator
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