| 6038321 |
Data transfer method, communication system and storage medium |
| Mar-14-2000 |
In a communication system, a transmitter device encrypts variable-length data having a data length corresponding to a kind of information to be transferred or a communication capacity, using a natural... |
| 6031910 |
Method and system for the secure transmission and storage of protectable information |
| Feb-29-2000 |
A method and system for the secure transmission and storage of protectable information, such as patient information, by means of a patient card. The data stored on the patient card are protected by cryptographic... |
| 6023762 |
Multi-view personalized communications agent |
| Feb-8-2000 |
A data access and retrieval system comprises a plurality of user data sources each storing electronic data signals describing data specific to a user, or enabling services selected by a user; an agent... |
| 5864624 |
Method for activating and executing protected functions in a communication system |
| Jan-26-1999 |
In a communication system having a function or performance feature to be protected, the periodic transmission of encoded interrogation information is initiated by a security routine to ensure that the... |
| 5687238 |
Small size product cipher apparatus |
| Nov-11-1997 |
In a product cipher apparatus, a permutation is performed upon plaintext or ciphertext to generate a first message. At least two successive substitutions are performed upon the first message to generate... |
| 5659618 |
Multi-size cryptographic key system |
| Aug-19-1997 |
A system is employed for providing two different levels of protection for cryptographic devices transmitting digital information. The system is independent of the cryptographic algorithm used and works... |
| 5625349 |
Electronic lock and key system |
| Apr-29-1997 |
A system for controllably actuating a lock mechanism has a lock actuator control unit arranged to receive a key and to communicate with a programmable key control unit contained within the key. The lock... |
| 5222141 |
Apparatus and method for encoding data |
| Jun-22-1993 |
A first bit of the communication signal is encrypted and forwarded to a CRC where it is processed in parallel with the encryption of the second bit. The first bit is then passed to the scrambler and the... |
| 5214694 |
Scramble signal transmission system for earth station of communication satellite |
| May-25-1993 |
A system for transmitting a scramble signal for a sky port scramble system including an organization center for organizing data relating to customers etc. and first and second control units each having... |
| 4965766 |
Digital input/out circuit capable of sending and receiving data in different modes |
| Oct-23-1990 |
A digital input/output circuit to be connected between an internal data bus composed of 2.sup.n signal lines (n is zero or a positive integer) and 2.sup.n external terminals includes an output port for... |
| 4924520 |
Defining aircraft protocol by shorted pins |
| May-8-1990 |
Data protocol and format parameters are encoded by a modified connector located between a data source and a receiving memory. The modification includes the opening or shorting of pin connectors in a unique... |
| 4882751 |
Secure trunked communications system |
| Nov-21-1989 |
A trunked communications system that accommodates encrypted secure communications. The system uses both non-encrypted message detectors and encrypted message detectors to assure that the trunked central... |
| 4607137 |
Method of distributing and utilizing enciphering keys |
| Aug-19-1986 |
In a communication network with cryptographically protected connections a unique key is used for each connection between two subscribers, so that when one or more keys fall into the hands of an unauthorized... |
| 4596898 |
Method and apparatus for protecting stored and transmitted data from compromise or interception |
| Jun-24-1986 |
Protection of transmitted and stored data from compromise or interception is achieved by a combined terminal authentication and encryption technique using a random number as part of both the encryption... |
| 4405829 |
Cryptographic communications system and method |
| Sep-20-1983 |
A cryptographic communications system and method. The system includes a communications channel coupled to at least one terminal having an encoding device and to at least one terminal having a decoding... |
