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| Number | Title | Issue Date |
| 4590470 | User authentication system employing encryption functions A system which employs a pair of encryption functions f and g in the "log on" protocol of a computer dial-up arrangement. The functions are inverses of each other and, hence, a random sequence when encrypted with f and then with g results in the original ... | 05/20/1986 |
| 4588991 | File access security method and means An improved file access security technique and associated apparatus accesses data which is stored in encrypted form under one encryption key and re-stores the data re-encrypted under another encryption key, and produces a record of each access and data re... | 05/13/1986 |
| 4567516 | Special program decoding of scrambled subscription television transmissions This disclosure is concerned with a limited time operative decoder for special scrambled television program transmissions involving a voltage source for energizing the decoder of limited time effectiveness adapted to energize the decoder only during the l... | 01/28/1986 |
| 4546242 | Method for protecting against the re-transfer of uniquely recorded information on a data carrier and apparatus for recording and/or reading re-transfer-protected information A method of safeguarding against the re-transfer of uniquely recorded information on a data carrier (1) which includes the recording of the information data and in addition thereto simultaneously recording of additional information on the data carrier (1)... | 10/08/1985 |
| 4528588 | Method and apparatus for marking the information content of an information carrying signal An information signal (INF) which is transmitted in coded form (CINF) from a signal source (RC) to a signal receiver (4,5) is decoded at the receiver and at the same time marked (MINF) by the introduction of an identification information (ID) which is cha... | 07/09/1985 |
| 4525712 | Transaction processing system In a system for the transaction operation with terminal units connected to a central unit through the communication line, the transaction operation by use of an ineligible terminal unit is prevented. An illegality preventive information is provided for ea... | 06/25/1985 |
| 4479122 | Remotely controlled switched access to the console port of an electronic computer In order to insure continuous access to diagnostic and maintenance information from a computer, the console port of the computer is connected either to the console locally or to a terminal remotely. In response to an activating command from the remote ter... | 10/23/1984 |
| 4464678 | Time window key system for video scrambling A video scrambling device requires that a key signal be periodically inserted into a subscribers box, e.g. once a month. The key signal is a function of both the box number and the time, and thus once received must be inserted relatively quickly, e.g. an ... | 08/07/1984 |
| 4434361 | Transistor integrated circuit protected against the analysis, and a card comprising such a circuit A transistor integrated circuit particularly for use in transaction cards such as credit cards or payment cards comprises conductive film zones on the surface of the circuit having a shape and layout which makes it difficult or impossible to determine the... | 02/28/1984 |
| 4430728 | Computer terminal security system The invention provides a system for securing the access of a remote computer terminal (130) to a centrally located host computer (300). The system includes a first security circuit (200) interconnected with a calling telephone (100), a calling modem (110)... | 02/07/1984 |
| 4423287 | End-to-end encryption system and method of operation 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 one of a plurality of acquirer institutions and one of... | 12/27/1983 |
| 4409434 | Transistor integrated device, particularly usable for coding purposes In a transaction card such as a credit or payment card provided with an integrated circuit for performing and recording the transaction, communications between the card and an access terminal must be coded so as to prevent fraud attempts. An integrated ci... | 10/11/1983 |
| 4408203 | Security system for electronic funds transfer system A security system, particularly useful in an electronic funds transfer system, makes use of secret identification codes known only to system users. The codes are encrypted upon insertion into the system and are stored in a data processing unit in encrypte... | 10/04/1983 |
| 4370649 | Payment responsive data display network A payment responsive system for displaying information comprises at least one remote terminal adapted to display information for a pre-determined time upon payment, a central processor adapted to control input of information and transmission to the remote... | 01/25/1983 |
| 4354252 | Programmable digital data terminal for mobile radio transceivers In a data transmission system, for communicating messages between a base station and a plurality of mobile stations, each mobile station includes a radio frequency transceiver and a programmable data terminal for sending and receiving predeterminedly form... | 10/12/1982 |
| 4348696 | Television viewing control device A television viewing control device for recording the viewing time of one or more viewers watching a controlled television set and turning the television set off when a predetermined viewing time limit of any one of the viewers is exceeded. The viewing co... | 09/07/1982 |
| 4326098 | High security system for electronic signature verification The system provides both electronic signature and message verification with a minimum of excess coding information on an instantaneous basis and is easily restartable in a store and forward environment. The system is based on the concept of a vault or cen... | 04/20/1982 |
| 4314097 | Authenticator device for precluding compensating text modifications in transmitted messages An authenticator device designed to preclude undetected compensating text modifications in a message by sequentially processing each character of the message and producing an authenticator code as a result of said processing. As each message is received, ... | 02/02/1982 |
| 4310720 | Computer accessing system A communications link between a computer and a remote user is effected by a portable access unit which generates a nonrecurring access code which is a function of a password and a pseudorandomly generated number. The access code is transmitted and compare... | 01/12/1982 |
| 4295041 | Device for the protection of access to a permanent memory of a portable data carrier A portable data or information carrier in the form of a card or the like. In order to maximize the confidentiality of information stored in the carrier, and more specifically to limit the amount of information available to a would-be defrauder monitoring ... | 10/13/1981 |
| 4254307 | Sequential encoding and decoding apparatus for providing identification signals to a dictation recorder An encoder for manually or automatically providing a sequence of identifier signals and a decoder for same, in a remote dictation system. A pair of control lines (10, 10' and 11, 11') carry the identifier signals which are in part identical to signals use... | 03/03/1981 |
| 4238854 | Cryptographic file security for single domain networks 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 a variety of cryptographic operations. At initializat... | 12/09/1980 |
| 4238853 | Cryptographic communication security for single domain networks 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 of cryptographic operations. At initialization time, ... | 12/09/1980 |
| 4227253 | Cryptographic communication security for multiple domain networks 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 and communication terminals. The host systems and... | 10/07/1980 |
| 4025760 | Security means for transaction terminal system A transaction terminal system is provided including means which prevent the utilization of certain tapped-line data. Security data, such as personal identification numbers or card security codes, is allowed to be distorted by each terminal in a manner whi... | 05/24/1977 |
| 4012583 | Pay TV control system A simple recyclable key and locking system for enabling a pay TV converter is disclosed. The key is a small tag such as might be attached to the room key of a hotel room and is to be turned in with the room key. The TV viewing key is inserted into a locki... | 03/15/1977 |
| 3997873 | Multiterminal monitoring system Apparatus for controlling and recording the use of a plurality of photocopiers are disclosed. The apparatus includes a terminal associated with each of the photocopiers and a central recorder connected to each of the terminals. Each authorized user of the... | 12/14/1976 |
| 3984637 | Computer terminal security system This invention is a security system for computer terminals which system provides means for preventing the unauthorized access to digital computers from illicit terminals. The invention provides a local code unit which includes means for manually selecting... | 10/05/1976 |
| 3956615 | Transaction execution system with secure data storage and communications A transaction execution system includes a host data processing system having a multiple account data base and a plurality of transaction terminals in communication with the host. The terminals each include a keyboard, a display, document handling subsyste... | 05/11/1976 |
