| 5940508 |
Method and apparatus for seamless crypto rekey system |
| Aug-17-1999 |
Equipment (10, 20) for facilitating point-to-point cryptographic data communication systems is disclosed. The seamless rekey cryptosystem permits changing of the crypto key (70, 80) with no down time.... |
| 5930362 |
Generation of encryption key |
| Jul-27-1999 |
A set of Diffie-Hellman data encryption values is generated prior to receiving a request for the data encryption values. The data encryption values are then stored in a database. The generating and storing... |
| 5889861 |
Identity confidentiality method in radio communication system |
| Mar-30-1999 |
The radio communication system has at least one first radio station such as a base station and a plurality of second radio stations such as mobile stations. The base station at least possesses a public... |
| 5850445 |
Authentication key management system and method |
| Dec-15-1998 |
A system and method for automatically securely generating and programming an MS and SAMS with the sensitive authentication information while significantly reducing the risk of misappropriation of the sensitive... |
| 5832086 |
Method for updating a communication unit parameter in a wireless communication system |
| Nov-3-1998 |
In one embodiment of the present invention, an update method preference value (401) is determined as between a group update method and an individual update method for a wireless communication system (100).... |
| 5805992 |
Method for validating a communication link |
| Sep-8-1998 |
The method of the present invention generally validates a communication link in a communication system. In particular, the method validates a communication link between a cordless base station and authorization... |
| 5793866 |
Communication method and device |
| Aug-11-1998 |
A system (100) and method of improving activation security allows a remote device (104) to identify that there is a difference between a first signal transmitted by a central site (102) and a first signal... |
| 5768380 |
Method for sending a communication unit parameter to a plurality of communication units |
| Jun-16-1998 |
In a wireless communication system (100), a communication unit parameter is sent to a plurality of communication units (105-108) during a first period of time using either a group update method or an individual... |
| 5737423 |
Old modified smart card or similar apparatus having a remote inspection capability |
| Apr-7-1998 |
An apparatus and method for remote inspection of a smart card or similar apparatus. A smart card includes an antenna and receiver for receiving transmitted messages and a display. The smart card responds... |
| 5708711 |
Method for selecting a preferred time interval in which to update a communication unit parameter |
| Jan-13-1998 |
For each communication unit (105-108) in a wireless communication system (100), a traffic probability value is determined for each of a plurality of time intervals (400). Additionally, an update preference... |
| 5708710 |
Method and apparatus for authentication in a communication system |
| Jan-13-1998 |
A method and apparatus for performing authentication in a communication system. The method includes the steps of detecting an unexpected authentication message, updating a counter value, comparing the... |
| 5638450 |
Method and apparatus for establishing two way communications between a pager device and a paging service provider |
| Jun-10-1997 |
A two way communications path is established between a pager device and a paging service provider. The pager device generates a control command for the paging service provider, converts the control command... |
| 5619572 |
Method and apparatus for providing secure communications for a requested call |
| Apr-8-1997 |
A secure communication system (100) that is capable of over-the-air-rekeying (OTAR) employs a key management controller (108) to provide secure communications for a requested call. The key management controller... |
| 5613214 |
Mobile communication terminal authenticating system |
| Mar-18-1997 |
A mobile communication terminal authenticating system for renewing an authenticating key without transmitting the authenticating key between the mobile communication terminal and the mobile communication... |
| 5608802 |
Data ciphering device |
| Mar-4-1997 |
A data ciphering device that has special application in implementing the Digital European Cordless Telephone (DECT) standard data ciphering algorithm which requires a lengthy procedure of key loading and... |
| 5528691 |
Method for automatically assigning enctyption information to a group of radios |
| Jun-18-1996 |
This invention provides for a method for automatically assigning encryption keys to radios in a communication system. The radio users need only specify which radio units should be able to communicate with... |
| 5515439 |
Exchange certificate for one way validation of information |
| May-7-1996 |
In a communications system, a method is described allowing two users having established a communication session identified by a unique session freshness proof, to transmit and validate a new value of a... |
| 5414753 |
Number assignment module setting system for portable telephone set |
| May-9-1995 |
In a number assignment module setting system for a portable telephone set, a portable telephone set inputs number assignment module in a number assignment module setting mode. A number assignment module... |
| 5412722 |
Encryption key management |
| May-2-1995 |
A key management system permits a high degree of autonomous rekeying activity by communication units (105) in a secure communication system (100). Responsive to time reference information transmitted by... |
| 5412721 |
Method for loading and utilizing a key in a secure transmission device |
| May-2-1995 |
An encryption code and at least one key are provided to a secure transmission device, via an external keying device, and stored in a volatile memory. A user code, entered via a keypad by a user, is received... |
| 5404403 |
Key management in encryption systems |
| Apr-4-1995 |
A key management system for encryption keys removes the effect of secure communications loss during a rekey period in a secure communications system. Use of key indexes to partition encryption keys into... |
| 5404404 |
Method for updating encryption key information in communication units |
| Apr-4-1995 |
Within a communication system, updating encryption key information in communication units of a particular communication group begins when a key management terminal transmits a key update message for the... |
| 5402491 |
Method for providing limited secure services in secure trunking communication systems |
| Mar-28-1995 |
In a secure trunking communication system, limited secure service is provided during periods of limited service or failsoft operations using the following method. When the limited service or failsoft condition... |
| 5381479 |
Method for over the air rekeying of multiple communication groups |
| Jan-10-1995 |
In a secure communication system 100, communication units in different communication groups may be simultaneously rekeyed over the air by having a managing key unit 101 generate a key packet 121. This... |
| 5371794 |
Method and apparatus for privacy and authentication in wireless networks |
| Dec-6-1994 |
A method and apparatus is disclosed for providing a secure wireless communication link between a mobile nomadic device and a base computing unit. A mobile sends a host certificate (Cert.sub.-- Mobile)... |
| 5363447 |
Method for loading encryption keys into secure transmission devices |
| Nov-8-1994 |
An encryption code and at least one key are provided to a secure transmission device, via an external keying device, and stored in a first volatile memory. An encrypted representation of the at least one... |
| 5341427 |
Algorithm independent cryptographic key management apparatus |
| Aug-23-1994 |
An apparatus for secure communications contains a controller for automatically selecting one of several data ciphering devices utilizing one of a plurality of ciphering algorithms common to transmitting... |
| 5325432 |
Method for updating encryption key information in communication units |
| Jun-28-1994 |
Within a communication system, an encryption controller receives unit identification information from a plurality of encrypting/decrypting communication units. For any individual communication unit, the... |
| 5301232 |
Method and apparatus for over-the-air programming of communication devices |
| Apr-5-1994 |
In a communication system (300), a controller interface (302) provides for monitoring of channel activity in order to determine communication devices (400) which are communicating using old encryption... |
| 5293576 |
Command authentication process |
| Mar-8-1994 |
A slave station, such as an orbiting satellite, and a master station, such as a ground control station, have their own lists of random pads. The master and slave station lists are identical. When the master... |
| 5278905 |
Method and apparatus for processor base encryption |
| Jan-11-1994 |
The penalties and drawbacks associated with encrypting information in a portable device having a microprocessor are avoided by, in advance of the time for encryption to begin, having the microprocessor... |
| 5247576 |
Key variable identification method |
| Sep-21-1993 |
In a communication system that includes a plurality of communication units, a communication resource allocator, and a limited number of transceivers that transceive information amongst the plurality of... |
| 5241597 |
Method for recovering from encryption key variable loss |
| Aug-31-1993 |
A method for recovering from encryption key variable loss, either inadvertent or the result of tampering. A predetermined key encryption key is encrypted with itself at the time when keys are first loaded,... |
| 5216715 |
Key distribution in public communication networks taking account of security gradations |
| Jun-1-1993 |
A public communication system for a plurality of communication services (ISDN) has an arrangement for the authentification of the subscriber stations (TLN A, TLN B) for the key transmission. For a first... |
| 5208859 |
Method for rekeying secure communication units by group |
| May-4-1993 |
A method for storing and managing rekeying information for a secure communication system, as well as for carrying out a rekeying operation. Encryption key variables stored in memory (301) are represented... |
| 5185797 |
Encrypted trunked control channel system |
| Feb-9-1993 |
A trunked communication system (400) transmits and receives encrypted signals over the system control channel (402). The trunked system (b 400) includes a plurality of radios (300) which can communicate... |
| 5185795 |
Authentication of rekey messages in a communication system |
| Feb-9-1993 |
A method of message authentication in an encrypted communication system with over-the-channel rekeying features the ability of a communication unit (107) to authenticate (1709) a rekeying message (701)... |
| 5185796 |
Encryption synchronization combined with encryption key identification |
| Feb-9-1993 |
In an encrypted radio system, transmsitters and receivers can each be provided with a plurality of encryption algorithms (407 and 425) and/or encryption key variables (408 and 426). A unique logical ID... |
| 5173938 |
Key management system |
| Dec-22-1992 |
This key management system effectively solves the key distribution problems of distance, time, operator error, and security risk by transferring encryption keys with appropriate system information between... |
| 5164986 |
Formation of rekey messages in a communication system |
| Nov-17-1992 |
Formation and sending of rekeying messages (305, 415, 515, and 605) in an encrypted communication system with over-the-channel rekeying of communication units is performed by a KMC, key management controller... |
| 5150408 |
Key distribution communication system |
| Sep-22-1992 |
This method of key distribution locates (401,501) an individual communication unit (107) within an encrypted communication system with over-the-channel rekeying and then rekeys (415, 515) the unit. The... |
| 5146497 |
Group rekey in a communication system |
| Sep-8-1992 |
This method of key distribution rekeys (605) a group of communication units (107) within an encrypted communication system with over-the-channel rekeying. The method uses a key management controller (101)... |
| 5146498 |
Remote key manipulations for over-the-air re-keying |
| Sep-8-1992 |
A method of remotely changing an original voice encryption key in a secure radio (10) is provided which includes a central controller (20) transmitting to the secure radio a digital word (42) representing... |
| 5124117 |
Cryptographic key distribution method and system |
| Jun-23-1992 |
A method for establishing cryptographic communications comprising the steps of: generating a first key-encryption-key signal; transforming, using a public-key-encryption algorithm, the first key-encryption-key... |
| 5093860 |
Key management system |
| Mar-3-1992 |
This key management system effectively solves the key distribution problems of distance, time, operator error, and security risk by transferring encryption keys with appropriate system information between... |
| 5001756 |
Decryption device with variable clock |
| Mar-19-1991 |
A decryption device wherein an encryption/decryption module can be operated at various clock speeds, and wherein an associated processor controls these clock speeds depending upon the moment to moment... |
| 4993067 |
Secure satellite over-the-air rekeying method and system |
| Feb-12-1991 |
A secure satellite over-the-air rekeying method and system are shown. This system provides a geometric filter for allowing message input to a satellite from ground stations having a particular predefined... |
| 4914697 |
Cryptographic method and apparatus with electronically redefinable algorithm |
| Apr-3-1990 |
A cryptographic apparatus for encrypting and decrypting digital words includes a mechanism that permits a cipher algorithm to be electronically stored after the manufacture of the apparatus. The storing... |
| 4811377 |
Secure transfer of radio specific data |
| Mar-7-1989 |
The apparatus and method for transferring radio specific data from the memory of an integral logic unit of a radiotelephone to a second, replacement, memory is disclosed. Security of the data is realized... |
| 4688250 |
Apparatus and method for effecting a key change via a cryptographically protected link |
| Aug-18-1987 |
Messages sent from an earth station to a satellite by a command link are authenticated within the satellite before being executed. Authentication is accomplished by comparing a codeword appended to the... |
