| 5812666 |
Cryptographic key management and validation system |
| Sep-22-1998 |
A Key Management System for generating, distributing and managing cryptographic keys used by an information transaction system that employs cryptographic means to produce evidence of information integrity.... |
| 5812664 |
Key distribution system |
| Sep-22-1998 |
This invention is a system for producing and distributing new decryption keys to verifiers. Verifier decryption key updates are printed in a secure manner on paper or postcards and mailed to the owners... |
| 5790663 |
Method and apparatus for software access to a microprocessor serial number |
| Aug-4-1998 |
A method and apparatus for software to access a microprocessor serial number. Provision of the serial number allows the manufacturer better control over its product and also permits software vendors to... |
| 5751805 |
Data-protecting system |
| May-12-1998 |
A data-protection system which permits authorized users to use a target data through a simple operation but does not permit unauthorized users to use the program even though they may be able to copy it.... |
| 5719938 |
Methods for providing secure access to shared information |
| Feb-17-1998 |
The inventive methods employ symmetric encryption with first and second keys to provide secure access to information accessible to be shared among a dynamically changing set of authorized users on a network... |
| 5712800 |
Broadcast key distribution apparatus and method using chinese remainder |
| Jan-27-1998 |
A communication system utilizing low bandwidth requirements for transmitting an encoded value formulated using the Chinese Remainder procedure to receivers having a private key. The system offers the advantages... |
| 5661803 |
Method of token verification in a key management system |
| Aug-26-1997 |
A method of token verification in a Key Management System provides a logical device identifier and a master key created in a logical security domain to a transaction evidencing device, such as a digital... |
| 5646992 |
Assembly, distribution, and use of digital information |
| Jul-8-1997 |
Hierarchically organized graphical representations of items and groups of the items of digital information which are available to be ordered by a user are displayed. The user interactively explores the... |
| 5636280 |
Dual key reflexive encryption security system |
| Jun-3-1997 |
A security system is disclosed, which system is for granting access to a host computer in response to a demand from a remote computer. The security system has a permanent encryption key mounted on the... |
| 5615264 |
Encrypted data package record for use in remote transaction metered data system |
| Mar-25-1997 |
The disclosed system relates to metered use cryptographic systems, and particularly to a data package and system operation for effecting metered purchases of encrypted data from a local encrypted database.... |
| 5604807 |
System and scheme of cipher communication |
| Feb-18-1997 |
A cipher communication system and scheme capable of realizing the cipher communication without affecting the already existing application programs and hardware, and establishing a synchronization at the... |
| 5604801 |
Public key data communications system under control of a portable security device |
| Feb-18-1997 |
A data communications system is described in which messages are processed using public key cryptography with a private key unique to one or more users (150) under the control of a portable security device... |
| 5602918 |
Application level security system and method |
| Feb-11-1997 |
A system and method for establishing secured communications pathways across an open unsecured network, without compromising the security of any parties to the communication, involves establishing secured... |
| 5600722 |
System and scheme of cipher communication |
| Feb-4-1997 |
A cipher communication system and scheme capable of realizing the cipher communication without affecting the already existing application programs and hardware, and establishing a synchronization at the... |
| 5557679 |
Method for personalization of an active card |
| Sep-17-1996 |
Personalization of an active so-called SIM card for a mobile telephone system of the GSM type is effected in a place connected to the central computer of the system via a communication network. The card... |
| 5555309 |
Cryptographic key management apparatus and methods |
| Sep-10-1996 |
The present invention provides for a cryptographic key management method and apparatus in which the cryptographic keys are provided as vector keys in that they comprise a key value and control information... |
| 5544245 |
Mutual authentication/cipher key delivery system |
| Aug-6-1996 |
The network and each user i share an encryption algorithm EK.sub.i () using his authentication key K.sub.i as a cipher key, its inverse function EK.sub.i.sup.-1 (), a specific function F() and its inverse... |
| 5448638 |
Security apparatus and system for retail environments |
| Sep-5-1995 |
A gasoline service station includes gasoline dispensers and a PIN pad including keypads for receiving personal identification numbers and assembled into a network for securely communicating personal identification... |
| 5440631 |
Information distribution system wherein storage medium storing ciphered information is distributed |
| Aug-8-1995 |
A system for use when distributing information stored in a piece of storage medium from a supplier to users through a distributor(s). The information is ciphered when stored in each piece of storage medium... |
| 5432849 |
Secure cryptographic operations using control vectors generated inside a cryptographic facility |
| Jul-11-1995 |
The invention described herein suggests methods of cryptographic key management based on control vectors in which the control vectors are generated or derived internal to a cryptographic facility implementing... |
| 5428684 |
Electronic cashless transaction system |
| Jun-27-1995 |
A key control method is for use in an electronic cashless transaction system including at least a bank center, a store transaction terminal and an IC card being used as an electronic cashless transaction... |
| 5410602 |
Method for key management of point-to-point communications |
| Apr-25-1995 |
A method of secure key distribution in a communication system having a plurality of subscriber units and an infrastructure communication center is provided. A first subscriber unit sends a request to the... |
| 5406626 |
Radio receiver for information dissemenation using subcarrier |
| Apr-11-1995 |
A radio receiver receives FM subcarrier transmissions, and stores the transmitted textual information in a random access memory. The information is typically news, weather, sports, entertainment or other... |
| 5381478 |
Cipher communication system for transaction data |
| Jan-10-1995 |
A cipher communication system for communicating transaction data between a host computer and a portable electronic device, wherein the host computer includes a first memory for storing a master key data,... |
| 5351296 |
Financial transmission system |
| Sep-27-1994 |
A method and device for determining and securely transmitting an account code of a financial card over a communications link in a communications network to a remote location which also allows a telephone... |
| 5337357 |
Method of software distribution protection |
| Aug-9-1994 |
A method is provided for protecting distributed software which relies on a unique factor such as an accessible serial number or the generation of a profile or fingerprint of the computer of the user which... |
| 5319710 |
Method and means for combining and managing personal verification and message authentication encrytions for network transmission |
| Jun-7-1994 |
The method and means of transmitting a user's transaction message to a destination node in a computer-secured network operates on the message, and a sequence number that is unique to the transaction message... |
| 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... |
| 5313521 |
Key distribution protocol for file transfer in the local area network |
| May-17-1994 |
A cryptographic communications apparatus and method for use with a first terminal, a file server, a key distribution center and a communications channel. The method is made simple by using classical-key-encryption... |
| 5267313 |
File security system |
| Nov-30-1993 |
A file security system of such a constitution that after plaintext has been enciphered by data encryption key means the encryption key means per se is stored or made freely transmissible in the state further... |
| 5265164 |
Cryptographic facility environment backup/restore and replication in a public key cryptosystem |
| Nov-23-1993 |
A computer apparatus, program and method function in a data processing system to replicate a cryptographic facility. The system includes a first cryptographic facility containing a portable part which... |
| 5247575 |
Information distribution system |
| Sep-21-1993 |
An information distribution system provides information to a user, when the information corresponds to criteria individually selected by the user, and then charges the user only for the selected information... |
| 5235641 |
File encryption method and file cryptographic system |
| Aug-10-1993 |
In an information processing system having an upper rank apparatus and an external storage device which performs transmission and reception of data between the storage device and the upper rank apparatus,... |
| 5177791 |
Secure translation of usage-control values for cryptographic keys |
| Jan-5-1993 |
A working key of a certain key type is to be transmitted from a first system (having a first usage-control value associated with keys of the certain type) and a second system (having a second usage-control... |
| 5142578 |
Hybrid public key algorithm/data encryption algorithm key distribution method based on control vectors |
| Aug-25-1992 |
The patent describes a method and apparatus for securely distributing an initial Data Encryption Algorithm (DEA) key-encrypting key by encrypting a key record (consisting of the key-encrypting key and... |
| 5134656 |
Pre-payment television system using a memory card associated with a decoder |
| Jul-28-1992 |
According to the invention, on the emitter side, a number generator (10) delivers a random code (XAL) which is sent to the input of a master card (11) which ciphers such code according to a predetermined... |
| 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... |
| 5111504 |
Information processing apparatus with replaceable security element |
| May-5-1992 |
A field upgradeable security system deciphers signals received from a communication network. An information processor includes a receptacle for receiving a replaceable security element. The replaceable... |
| 5081677 |
Crypotographic key version control facility |
| Jan-14-1992 |
A facility for making dynamic changes to a system master key without stopping the system, and without loss of integrity to ongoing cryptographic operations. A version number is generated and associated... |
| 5081676 |
Method and apparatus for protecting multiple copies of computer software from unauthorized use |
| Jan-14-1992 |
A hardware device containing a first permanent key and a second key is plugged in a specified port of a computer to establish a communication path between the hardware device and computer. The first and... |
| 5058162 |
Method of distributing computer data files |
| Oct-15-1991 |
A method of distributing a plurality of data files to a plurality of recipients including the steps of: placing encrypted copies of the data files to be distributed on a plurality of identical media and... |
| 5029207 |
External security module for a television signal decoder |
| Jul-2-1991 |
A decoder for descrambling encoded satellite transmissions comprises an internal security element and a replaceable security module. The program signal is scrambled with a key and then the key itself is... |
| 5014312 |
Security system for the protection of programming zones of a chip card |
| May-7-1991 |
The use of chip cards, with the level of security of the type associated with chip cards of the type used by banks, is extended to move widespread use by organizing a secure dispatch of blank chip cards... |
| 5010571 |
Metering retrieval of encrypted data stored in customer data retrieval terminal |
| Apr-23-1991 |
A system for controlling and accounting for retrieval of data from a CD-ROM memory containing encrypted data files from which retrieval must be authorized. The system includes an authorization and key... |
| 5008936 |
Backup/restore technique in a microcomputer-based encryption system |
| Apr-16-1991 |
An improved method and system for backing-up secure files in a data encryption unit is described. In accordance with the teachings of this invention, encrypted files are read from the memory of a first... |
| 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... |
| 4993069 |
Secure key management using control vector translation |
| Feb-12-1991 |
A cryptographic system and method is provided which accepts a key K encrypted under a key formed by exclusive-ORing a key-encrypting key KK with a first control vector C5 and outputs the same key K encrypted... |
| 4933971 |
Method for encrypting transmitted data using a unique key |
| Jun-12-1990 |
The invention comprises a method for encrypting data for communication between a host computer and each of a plurality of remote terminals in a network. A method is provided for periodically generating... |
| 4924513 |
Apparatus and method for secure transmission of data over an unsecure transmission channel |
| May-8-1990 |
Apparatus and methods, readily adapted to interface with a standard data transmission network having an unsecure transmission channel, e.g., "Ethernet," for the provision of secure transmission of data... |
| 4888800 |
Secure messaging systems |
| Dec-19-1989 |
A secure communication system wherein encrypted messages are passed between selected pairs of user terminals in a secure messaging system. A link is first established between the two terminals of the pair,... |
