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)
07/1989
07/18/1989US4850019 Data randomization equipment
07/18/1989US4850017 Controlled use of cryptographic keys via generating station established control values
07/04/1989US4845726 Maximum length linearly recurring sequence generator control device
07/04/1989US4845654 Pseudo random noise code generator
06/1989
06/29/1989DE3833031A1 Descrambler, particularly for digital satellite sound broadcast signals
06/27/1989CA1256610A1 Method of secured communications in a telecommunications system
06/27/1989CA1256577A1 Data encoding/decoding circuit
06/20/1989US4841570 One-way transformation of information
06/13/1989CA1255784A1 Signed document transmission system
06/13/1989CA1255769A1 Secured message transfer system and method using updated session code
06/06/1989US4837790 Maximum length linearly occurring code sequence generator
05/1989
05/31/1989EP0318097A1 Undeniable signature systems
05/24/1989EP0317400A1 Apparatus and method for securing data exchange between a teletext terminal and a host
05/03/1989EP0314203A2 System for enabling descrambling on a selective-subscription basis in a subscriber communication network
05/03/1989EP0313576A1 Gateway system and method for interconnecting telephone calls with a digital voice protected radio network.
05/02/1989US4827514 Method and apparatus to detect and recover a pseudo-random sequence
05/02/1989US4827513 Communications system
05/02/1989CA1253617A1 Digital signal composing circuit for cross-fade signal processing
04/1989
04/20/1989WO1989001690A3 Device for identifying news items
04/18/1989US4823389 Method and circuit apparatus for checking the authorization of access to a signal processing system
04/18/1989US4823388 Communications network using an enciphering and deciphering device
04/12/1989EP0311470A1 Methods and systems to authenticate authorizations and messages with a zero knowledge-proof system and to provide messages with a signature
04/06/1989WO1989003143A1 Field initialized authentication system for protective security of electronic information networks
04/05/1989EP0309447A1 Ciphering and deciphering device.
03/1989
03/28/1989US4817145 Generator for generating binary ciphering sequences
03/28/1989US4817143 Scrambled signal receiver
03/28/1989US4817142 Restoring framing in a communications system
03/28/1989US4816651 Process and apparatus for the simultaneous and remote reading and certifying of an information present in a memory of an electronic medium
03/22/1989EP0307627A1 Secret key generation and distribution method
03/21/1989US4815130 Stream cipher system with feedback
03/21/1989US4815128 Gateway system and method for interconnecting telephone calls with a digital voice protected radio network
03/21/1989US4815031 Method for granting a request to authorized data terminal users accessing from any locations
03/21/1989US4813912 For securing operation against tampering
03/07/1989US4811394 Variable starting state scrambling circuit
03/07/1989US4811393 Method and system for diversification of a basic key and for authentication of a thus-diversified key
03/07/1989US4811392 Communications network
03/01/1989EP0304733A1 Data-transmission method
03/01/1989EP0304547A2 Identification control apparatus, method for cryptographic identity control and method for detecting an interruption between a terminal and a communication system
03/01/1989EP0304458A1 Access systems
02/1989
02/28/1989US4809327 Encrtption of messages employing unique control words and randomly chosen encryption keys
02/28/1989US4809295 Code lengthening system
02/23/1989WO1989001690A2 Device for identifying news items
02/21/1989US4807288 Microprocessor intended particularly for executing the calculation algorithms of a public code encoding system
02/21/1989US4807284 Security device for sensitive data
02/14/1989US4805216 Method and apparatus for continuously acknowledged link encrypting
02/07/1989US4803726 Bit synchronization method for a digital radio telephone system
02/07/1989US4803725 Cryptographic system using interchangeable key blocks and selectable key fragments
02/07/1989CA1249865A1 Method for establishing user authentication with composite session keys among cryptographically communicating nodes
02/01/1989EP0301383A2 Pseudo random pattern generating device
01/1989
01/31/1989US4802220 Method and apparatus for multi-channel communication security
01/31/1989US4802217 Method and apparatus for securing access to a computer facility
01/25/1989EP0300824A2 Cryptographic communication
01/17/1989US4799259 Monolithic random digital noise generator
01/17/1989US4799061 Secure component authentication system
01/10/1989US4797928 Encryption printed circuit board
01/10/1989US4797922 Method of, and apparatus for, transforming a digital data sequence into an encoded form
01/10/1989US4797921 System for enciphering or deciphering data
01/10/1989US4797672 Voice network security system
12/1988
12/27/1988US4794644 Method of secured communications in a telecommunications system
12/20/1988US4792973 Selective enablement of descramblers
12/14/1988EP0294397A1 Automated transaction system using microprocessor cards.
12/13/1988US4791669 Encryption/decryption system
12/07/1988EP0294248A1 Method and apparatus for authorizing access to data or data communication lines
12/06/1988US4790012 Encryption-decryption system
11/1988
11/30/1988EP0292790A2 Controlling the use of cryptographic keys via generating station established control values
11/23/1988EP0292247A2 Authenticator
11/22/1988US4787027 System using an adapter board to couple a personal computer to a plurality of peripherals in a financial environment
11/17/1988EP0291405A2 Nonlinear random sequence generators
11/15/1988US4785410 Maximum length shift register sequences generator
11/15/1988CA1244949A1 Cyphering device using substitutions and permutations
11/08/1988US4783801 Apparatus for protecting secret information
11/08/1988US4783798 For ensuring that only authorized users are given access for transmissions
11/02/1988EP0289086A2 A method of and arrangement for digital signal encryption
11/01/1988US4782529 Decryption of messages employing unique control words and randomly chosen decryption keys
11/01/1988CA1244154A1 Digital signal transmitting system
11/01/1988CA1244090A1 Cryptographic system for direct broadcast satellite network
10/1988
10/26/1988EP0287720A1 Management of cryptographic keys
10/25/1988US4780840 Method of generating a pseudo-random sequence of signs of a large sequence length
10/25/1988CA1243738A1 Method and system for enciphering and deciphering information between a transmitting device and a receiving device
10/25/1988CA1243737A1 Self-synchronizing scrambler
10/13/1988DE3809795A1 Information transmission system using IC cards
10/12/1988EP0286489A1 Method and controller for enciphering a message according to a public key algorithm
10/05/1988EP0285520A1 Method for conveying secret keys to security modules and user cards in a data-processing network
10/04/1988US4776011 Recursive key schedule cryptographic system
09/1988
09/29/1988DE3731771A1 Coding method using genuine random sequences
09/28/1988EP0284133A2 Method for simultaneously reading from a distance and verifying information present in a memory of an electronic data carrier
09/28/1988EP0283758A2 Clock manipulated autonomous automaton
09/27/1988CA1242501A1 Method of recognizing the unauthorized use of an identification
09/27/1988CA1242500A1 Circuit arrangement for preventing unauthorized access to a communication system which is protected by a subscriber-specific password
09/21/1988EP0283432A1 Method and apparatus for protecting secret elements in a cryptographic devices network with open key management
09/21/1988EP0282570A1 Metering retrieval of encrypted data stored in customer data retrieval terminal.
09/14/1988EP0282123A1 System and method for cryptography, including application
09/13/1988US4771462 Communication port encryption/decryption method and apparatus
09/13/1988US4771461 Initialization of cryptographic variables in an EFT/POS network with a large number of terminals
09/13/1988US4771459 System for storing and distributing keys for cryptographically protected communication
09/13/1988US4771458 Secure data packet transmission system and method
09/07/1988WO1988006826A1 Access systems
09/07/1988EP0281225A2 Secure information storage
09/07/1988EP0281224A2 Secure messaging systems
09/07/1988EP0281223A2 Secure messaging systems
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