| 4888802 |
System and method for providing for secure encryptor key management |
| Dec-19-1989 |
A system and method for storing encrypter keys in a secure manner to prevent a "debugger" or an unauthorized user of a user application from compromising the keys. A static RAM with a battery support is... |
| 4887296 |
Cryptographic system for direct broadcast satellite system |
| Dec-12-1989 |
A three key cryptographic system is used in the transmission of digitized signals to a plurality of receivers, each having a unique address number and a factory stored signature key which is a function... |
| 4881263 |
Apparatus and method for secure transmission of data over an unsecure transmission channel |
| Nov-14-1989 |
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... |
| 4864615 |
Reproduction of secure keys by using distributed key generation data |
| Sep-5-1989 |
A key security system provides for the reproduction of secure keys by using distributed key generation data and a distributed encrypted prekey. The system encrypts program key generation data with a program... |
| 4853961 |
Reliable document authentication system |
| Aug-1-1989 |
A system for reliably authenticating a document includes a device having a decryption key therein that, upon application to information provided by a user, reveals not only a plain text message indicating... |
| 4850017 |
Controlled use of cryptographic keys via generating station established control values |
| Jul-18-1989 |
A method for controlling the use of a cryptographic key at a using station by a generating station in a network of generating and using stations is disclosed. A control value specifying the use of the... |
| 4817140 |
Software protection system using a single-key cryptosystem, a hardware-based authorization system and a secure coprocessor |
| Mar-28-1989 |
The invention provides a software asset protection mechanism which is based on the separation of the software to be protected from the right to execute that software. Protected software can only be executed... |
| 4794644 |
Method of secured communications in a telecommunications system |
| Dec-27-1988 |
The Telecommunications system includes at least two exchanges and a plurality of user equipments. Each equipment includes a store for holding a user variable data word particular to that user. Each exchange... |
| 4771458 |
Secure data packet transmission system and method |
| Sep-13-1988 |
A bit packet communication system includes a head end having a software implemented 16 bit shift register with a plurality of feed-forward taps and a different plurality of feedback taps for simultaneously... |
| 4757534 |
Code protection using cryptography |
| Jul-12-1988 |
A cryptographic method for discouraging the copying and sharing of purchased software programs allows an encrypted program to be run on only a designated computer or, alternatively, to be run on any computer... |
| 4747050 |
Transaction security system using time variant parameter |
| May-24-1988 |
An electronic funds transfer system (EFT) is described in which retail terminals located in stores are connected through a public switched telecommunication system to card issuing agencies data processing... |
| 4731842 |
Security module for an electronic funds transfer system |
| Mar-15-1988 |
A security module for use in an electronic funds transfer terminal is contained in a tamper-resistant housing. The module has a PIN pad and is designed to encrypt secret data, such as users personal identity... |
| 4694491 |
Cryptographic system using interchangeable key blocks and selectable key fragments |
| Sep-15-1987 |
A cryptographic system is used for the secure transmission of digitized signals to a plurality of receivers. At the transmission end, a key consisting of two blocks, each including a plurality of key fragments,... |
| 4578530 |
End-to-end encryption system and method of operation |
| Mar-25-1986 |
An efficient end-to-end encryption system including key management procedures for providing secure, financial data communication between a system user at one of a plurality of transaction terminals of... |
| 4536647 |
Pocket banking terminal, method and system |
| Aug-20-1985 |
A portable banking terminal under control of an authorized user and operating within a system of banks and retailers may be initialized for personal use under separate controls by the banks and the retailers... |
| 4500750 |
Cryptographic application for interbank verification |
| Feb-19-1985 |
In a data communication network which includes terminals interconnected via a central switch, a process for verifying the identity of a terminal user who is provided with secret data associated with his... |
| 4458109 |
Method and apparatus providing registered mail features in an electronic communication system |
| Jul-3-1984 |
The method and the apparatus provide a security feature in an electronic communication system which contains a first and a second terminal and a communication network. The first terminal is designed for... |
| 4453074 |
Protection system for intelligent cards |
| Jun-5-1984 |
There is disclosed a protection system for intelligent cards. Each card has stored in it a code which is the encryption of a concatenation of a user secret password and a common reference text. The encryption... |
| 4423287 |
End-to-end encryption system and method of operation |
| Dec-27-1983 |
An efficient end-to-end encryption system including key management procedures for providing secure, financial data communication between a system user at one of a plurality of transaction terminals of... |
| 4386234 |
Cryptographic communication and file security using terminals |
| May-31-1983 |
A data security device which includes storage means for storing a master cipher key, cryptographic apparatus for performing cryptographic operations and control means for controlling the writing of a master... |
| 4386233 |
Crytographic key notarization methods and apparatus |
| May-31-1983 |
Cryptographic keys for a cryptographic function are notarized by encrypting the keys with the cryptographic function using a notarizing cryptographic key derived from identifier designations associated... |
| 4323921 |
System for transmitting information provided with means for controlling access to the information transmitted |
| Apr-6-1982 |
A system for transmitting information between an emitting center and receiving stations, comprising: a subscription administration center generating a plurality of subscriber's keys C.sub.i changing randomly... |
| 4317957 |
System for authenticating users and devices in on-line transaction networks |
| Mar-2-1982 |
A method for efficiently protecting transactions and providing authentication of users and devices in on-line systems that transfer funds electronically, dispense cash, or provide a good or permit a service... |
| 4288659 |
Method and means for securing the distribution of encoding keys |
| Sep-8-1981 |
An improved secured data transmission system relies on the favorable comparison of coded signals derived from information about authorized individuals and particular data terminals that is both prestored... |
| 4281216 |
Key management for encryption/decryption systems |
| Jul-28-1981 |
In a data encryption/decryption system providing for security of data communications channels, a sub-system for generating, transporting encryption/decryption keys and for introducing those keys into the... |
| 4264782 |
Method and apparatus for transaction and identity verification |
| Apr-28-1981 |
A method and apparatus whereby the senders and receivers of messages sent over a transmission system including a Host CPU may guarantee the integrity of the data content of the message and also the absolute... |
| 4238854 |
Cryptographic file security for single domain networks |
| Dec-9-1980 |
A file security system for data files associated with a host data processing system. The host system includes a data security device which contains a secure host master key and is capable of performing... |
| 4238853 |
Cryptographic communication security for single domain networks |
| Dec-9-1980 |
A communication security system for data transmissions between remote terminals and a host system. The remote terminals and the host system include data security devices capable of performing a variety... |
| 4227253 |
Cryptographic communication security for multiple domain networks |
| Oct-7-1980 |
A communication security system for data transmissions between different domains of a multiple domain communication network where each domain includes a host system and its associated resources of programs... |
| 4223403 |
Cryptographic architecture for use with a high security personal identification system |
| Sep-16-1980 |
A Cryptographic Architecture for improving the security of Cash-Issuing or similar Terminal Systems when it is necessary to operate Off-Host. Each Terminal is connected to a central Controller which is... |
| 4193131 |
Cryptographic verification of operational keys used in communication networks |
| Mar-11-1980 |
In a data communication network providing communication security for communication sessions between a first station and a second station where each station has cryptographic apparatus provided with an... |
