| 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... |
| 5357571 |
Method for point-to-point communications within secure communication systems |
| Oct-18-1994 |
In a secure communication system, a secure point-to-point communication may be accomplished in the following manner. A first communications unit receives a request from an operator for a point-to-point... |
| 5319705 |
Method and system for multimedia access control enablement |
| Jun-7-1994 |
A method and system are disclosed for securely distributing a plurality of software files from a software distribution processor to a user processor, while selectively enabling the user processor to only... |
| 5309516 |
Group cipher communication method and group cipher communication system |
| May-3-1994 |
Method and system which permit, among a plurality of terminals, group cipher communication from a desired terminal to a number of desired terminals while ensuring safety of security. A plurality of secret... |
| 5301247 |
Method for ensuring secure communications |
| Apr-5-1994 |
A method for initiating secure communications between two stations. In this method, a first portion of a session data encryption key (DEK1) is randomly generated by an EDU in one of the stations. The DEK1... |
| 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... |
| 5297208 |
Secure file transfer system and method |
| Mar-22-1994 |
This invention is a system and method for securely and robustly transferring a file from one computer to another without having a prearranged encryption key. Data is transferred by first generating some... |
| 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... |
| 5276735 |
Data enclave and trusted path system |
| Jan-4-1994 |
A data communication system providing for the secure transfer and sharing of data via a local area network and/or a wide area network. The system includes a secure processing unit which communicates with... |
| 5272754 |
Secure computer interface |
| Dec-21-1993 |
Communication elements for secure data communication between remote nodes of a computer system on a standard communications medium. Terminals, workstations and personal computers are connected through... |
| 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... |
| 5224164 |
Method and apparatus for transliterating messages |
| Jun-29-1993 |
It is the object of the invention to realize a low-cost, low-effort cryptoanalytically secure encrypting/decrypting method for high data rates and large code key spaces. The solution provides for a message... |
| 5224166 |
System for seamless processing of encrypted and non-encrypted data and instructions |
| Jun-29-1993 |
A data processing system includes an internal cache memory in a secure physical region that is not accessible to a user of the system. An external memory is positioned outside of the secure physical region... |
| 5224163 |
Method for delegating authorization from one entity to another through the use of session encryption keys |
| Jun-29-1993 |
A method for delegating authorization from one entity in a distributed computing system to another for a computing session is disclosed wherein a session public/private encryption key pair is utilized... |
| 5222137 |
Dynamic encryption key selection for encrypted radio transmissions |
| Jun-22-1993 |
A radio (100) transmits and receives encrypted signals having unencrypted key identifiers, allowing other radios having the corresponding key identifiers and encryption keys to communicate with radio (100).... |
| 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... |
| 5214696 |
Data processing system and method to produce softcopy book readers which are limited to reading only books published by a specific publisher |
| May-25-1993 |
A data processing system method and program are disclosed for limiting a book reading program for softcopy books, to be capable of reading only softcopy books published by a selected publisher. The method... |
| 5214698 |
Method and apparatus for validating entry of cryptographic keys |
| May-25-1993 |
A cryptographic facility implements a multiple key part import procedure. The installation manager can verify that a key part has been correctly entered and has not been compromised. The security requirement... |
| 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... |
| 5200999 |
Public key cryptosystem key management based on control vectors |
| Apr-6-1993 |
A data processing system, method and program are disclosed, for managing a public key cryptographic system. The method includes the steps of generating a first public key and a first private key as a first... |
| 5199069 |
Automatic encryption selector |
| Mar-30-1993 |
A radio (100) capable of automatically selecting an encryption algorithm from among a plurality of algorithms (122 and 124) is disclosed. The method for automatically selecting the proper encryption hybrid... |
| 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... |
| 5182772 |
Method and apparatus for encoding, transmitting, receiving and de-coding information |
| Jan-26-1993 |
A clear language dictionary of items of information to be transmitted is provided for composing messages and is also electronically impressed in first memory elements of sending and receiving computers.... |
| 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... |
| 5170431 |
Electronic bolt lock with enhanced security features |
| Dec-8-1992 |
A high security bolt lock is described having the ability to reencrypt the combination code for the lock each time a key is used and thus partially defeat the use of an unauthorized key. The lock may be... |
| 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... |
| 5161189 |
Encryption and decryption of chained messages |
| Nov-3-1992 |
A single sync field (501) and multiple messages or message segments (503, 507, 511, and 515) are chained (407) together and encrypted (407) as a whole. When this encrypted chained message is received,... |
| 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... |
| 5136648 |
Message storage security system |
| Aug-4-1992 |
A voice message system having a plurality of user voice mailboxes is disclosed. The voice message system utilizes a method in which a message is encrypted using a unique encrypting key corresponding to... |
| 5131040 |
Method for backing up and erasing encryption keys |
| Jul-14-1992 |
A method for backing up and erasing encryption keys that provides a backup power supply (110) so that keys stored in a memory (104) will not be lost inadvertently, while still permitting keys to be erased,... |
| 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... |
| 5073935 |
Method for secure communication |
| Dec-17-1991 |
A method for the secure communication of messages. A first party is provided with a set of numbers that have the property that when encrypted using an RSA encryption key the resulting set of encrypted... |
| 5058164 |
Encryption of streams of addressed information to be used for program code protection |
| Oct-15-1991 |
An encryption method is taught which chooses certain bytes of data, stored in a particular on-chip memory, as encryption keys. These chosen bytes are used to encrypt themselves, and all of the remaining... |
| 5046094 |
Server-aided computation method and distributed information processing unit |
| Sep-3-1991 |
A server-aided computation method using a main unit for processing secret information and at least one auxiliary unit for supporting a computation that said main unit executes, said method comprising the... |
| 5033084 |
Method and apparatus for protection of software in an electronic system |
| Jul-16-1991 |
A method and apparatus for protecting software used in an electronic system. An electronic key is associated with the software, which is at least partially unreadable unless modified. The electronic system... |
| 5029206 |
Uniform interface for cryptographic services |
| Jul-2-1991 |
A security kernel of a secure processing system for providing security management, key management and kernel security functions. The secure processing system includes two parallel subsystems, a red subsystem... |
| 5016277 |
Encryption key entry method in a microcomputer-based encryption system |
| May-14-1991 |
An improved multi-channel data encryption system is described. The multi-channel data encryption device of the present invention includes a plurality of data of encryption devices in a single unit wherein... |
| 4972472 |
Method and apparatus for changing the master key in a cryptographic system |
| Nov-20-1990 |
A method and apparatus for changing the key in a cryptographic system or device are disclosed. A memory contains three storage areas for pending, active, and retired keys. New keys are loaded into the... |
| 4969188 |
Process and apparatus for the protection of secret elements in a network of encrypting devices with open key management |
| Nov-6-1990 |
Each encryption device of a communication network is divided into a base part and a security module in credit card form. The security module contains the functional stages required for the coding/decoding... |
| 4965804 |
Key management for encrypted packet based networks |
| Oct-23-1990 |
In a packet based communication network 10, a key management center 20 is used to distribute cryptographic keys for either a switched virtual circuit or a permanent virtual circuit. The disclosed methods... |
| 4944007 |
Public key diversification method |
| Jul-24-1990 |
A method is disclosed whereby individual members of a group of members or entities may be provided, under the control of a trusted member, referred to as the parent, with respective individual secret keys... |
| 4941176 |
Secure management of keys using control vectors |
| Jul-10-1990 |
The invention is an apparatus and method for validating that key management functions requested for a cryptographic key by the program have been authorized by the originator of the key. The invention includes... |
| 4933969 |
Data authentication and protection system |
| Jun-12-1990 |
A secure information storage system in which a directory stores identifying titles and pointers to areas of a memory storing respective messages. To protect the messages against unauthorized changes, a... |
| 4918728 |
Data cryptography operations using control vectors |
| Apr-17-1990 |
Data cryptography is achieved in an improved manner by associating with the data cryptography key, a control vector which provides the authorization for the uses of the key intended by the originator of... |
| 4912762 |
Management of cryptographic keys |
| Mar-27-1990 |
A method for simplifying key management in situations where unique cryptographic keying relationships are required end-to-end between pairs of parties and a symmetric encryption algorithm is to be used.... |
| 4910773 |
Method of dispatching secret keys to security modules and user cards in a data processing network |
| Mar-20-1990 |
The present invention relates to a method for dispatching at least one predetermined secret key, in order to make the implementation of a provision of service secure, characterized in that it comprises... |
| 4897875 |
Key management system for open communication environments |
| Jan-30-1990 |
A telecommunications security device for use on the communication medium includes a first and a second security unit each arranged to be inserted into for example the telephone line adjacent a user device.... |
