Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4802217 | Method and apparatus for securing access to a computer facility A security unit is disclosed for controlling access to a main computer system. The security unit provides a comprehensive mechanism for detecting and inhibiting sophisticated attackers. A method of operation and special purpose hardware for implementing t... | 01/31/1989 |
| 4797928 | Encryption printed circuit board An encryption printed circuit board (PCB) for use as an add on board to a host computer includes address registers, read/write controller, and data information transceiver adapted for connection to the host computer. The addresses registers are connected ... | 01/10/1989 |
| 4792973 | Selective enablement of descramblers A system in a subscriber television network for enabling descrambling of a received scrambled signal on a prepaid basis and/or an impulse-purchase basis. A received mask signal uniquely related to the scrambled signal is compared with a received authoriza... | 12/20/1988 |
| 4731843 | Method and device of increasing the execution speed of cipher feedback mode of the DES by an arbitrary multiplier In an encryption system comprising DES in a cipher feedback mode of k bits, a plain text bit stream is fed into n individual DES encryptors. The DES encryptor operates in parallel from a common input register containing cipher text bit streams so that the... | 03/15/1988 |
| 4727476 | Simulation and security device for data entry keyboard A simulation security device for a data entry keyboard of a computer is operative with an input-output unit and a keyboard of the computer. The device includes plural memories and a switching assembly which are operatively coupled to row and column signal... | 02/23/1988 |
| 4712238 | Selective-subscription descrambling A system in a subscriber television network for enabling descrambling of a received scrambled signal on a prepaid basis and/or an impulse-purchase basis. A received mask signal uniquely related to the scrambled signal is compared with a received authoriza... | 12/08/1987 |
| 4645871 | Non-interfering in-band protocol-independent diagnostic scanning in a digital multipoint communication system In a system in which data between a master and remote location is encrypted by using the DES algorithm, the status of security devices at the remote location is monitored from a centralized security station. A message indicative of the status of the secur... | 02/24/1987 |
| 4634808 | Descrambler subscriber key production system utilizing key seeds stored in descrambler A system for reproducing in a descrambler of a subscriber communication network a subscriber key signal that is unique to the descrambler and was used in encrypting a key signal that must be decrypted for use in descrambling a signal received by the descr... | 01/06/1987 |
| 4634807 | Software protection device In order to prevent the unauthorized copying of software, a software module is encrypted using the data encryption standard (DES) algorithm, and the key is encrypted using the public key of a public/private key algorithm. To use the module it is entered i... | 01/06/1987 |
| 4613901 | Signal encryption and distribution system for controlling scrambling and selective remote descrambling of television signals A system and method for scrambling and selectively descrambling television signals that are transmitted to subscribers' descramblers in a subscription television system. A working key signal is generated by processing an "initialization vector" signal in ... | 09/23/1986 |
| 4591660 | Common control audio decryptor Decryption of a plurality of simultaneously received, randomly phased signals is realized by employing a single data encryption standard module in a time shared manner. A plurality of process state counters, each of which is associated with a received sig... | 05/27/1986 |
| 4578530 | 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... | 03/25/1986 |
| 4558176 | Computer systems to inhibit unauthorized copying, unauthorized usage, and automated cracking of protected software A method and apparatus are provided for inhibiting unauthorized copying, unauthorized usage and automated cracking of proprietary software used in computer systems. The computer systems execute protected programs, which are protected by encapsulation and/... | 12/10/1985 |
| 4543646 | Chip topography for MOS Data Encryption Standard circuit An optimum chip topography for a MOS LSI Data Encryption Standard (DES) circuit, including interface and input/output circuitry disposed around the periphery of the chip, control circuitry disposed in a substantially rectangular area across the upper one-... | 09/24/1985 |
| 4520232 | Polygraphic encryption-decryption system A system for encoding, or encrypting, digital data wherein an invertible matrix of binary bits provides the encrypting factor or key, this invertible matrix being loaded in a memory. Blocks or sets of binary bits of data, a string of serially appearing bi... | 05/28/1985 |
| 4438824 | Apparatus and method for cryptographic identity verification The apparatus for identity verification using a data card contains at least one terminal and a security service station. The terminal(s) and the station are connected to each other via a communication system. The terminal is provided with a central proces... | 03/27/1984 |
| 4369332 | Key variable generator for an encryption/decryption device An apparatus and method for generating a unique working key variable for controlling the operation of an encryption/decryption device during each user specified time period. The apparatus generates each working key variable by encrypting a user specified ... | 01/18/1983 |
| 4352952 | Data security module A data security module for encrypting and decrypting computer data contains, in addition to the encryption logic, interface logic to allow direct memory access to a computer. The security module sits as a computer peripheral device and after being instruc... | 10/05/1982 |
| 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 |
| 4322577 | Cryptosystem Encryption and decryption of information of a message is performed by partitioning a plaintext message into blocks of binary digits and by further partitioning said blocks into subblocks which are interpreted as elements in a Galois-field. A plaintext mat... | 03/30/1982 |
| 4322576 | Message format for secure communication over data links Communication over data links using binary synchronous protocol that is to be made secure according to the Federal data encryption standard (DES) is enhanced by utilizing an encrypted message format wherein the initialization vector for the DES algorithm ... | 03/30/1982 |
| 4275265 | Complete substitution permutation enciphering and deciphering circuit A complete substitution permutation enciphering and deciphering circuit and method for transforming a plaintext signal into an enciphered signal which is secure during transmission. After receipt, the enciphered signal is transformed back into the origina... | 06/23/1981 |
| 4274085 | Flexible mode DES system A DES (Data Encryption Standard) system utilizing an input register, control logic and output register to provide for a selection from a multiplicity of operable modes on a single chip or family of chips.... | 06/16/1981 |
| 4268715 | Method and apparatus for securing data transmissions A method and apparatus are provided for improving the security of data transmissions between stations and for controlling secured transactions from remote locations in a data-transfer system. The method and apparatus obviate the need for transmitting user... | 05/19/1981 |
| 4262358 | DES Parity check system A system for providing on-line parity checking in data encryption/decryption systems such as DES and which is especially useful where multiple stage shifting is accomplished on a single clock input to the algorithm shift register of such a system. The par... | 04/14/1981 |
| 4249180 | Past dependent microcomputer cipher apparatus Apparatus for use in a secure data communication system includes a microcomputer that controls a cipher process by which sensitive data is encrypted before transmission. When activated, the apparatus accepts either cleartext or ciphertext and transforms t... | 02/03/1981 |
| 4203166 | Cryptographic file security for multiple domain networks A file security system for data files created at a first host system in one domain and recovered at a second host system in another domain of a multiple domain network. Each of said host systems contain a data security device provided with multiple host k... | 05/13/1980 |
| 4195196 | Variant key matrix cipher system This is a cipher system for enciphering a stream of binary data by means of a product cipher. A clear message represented in a binary data format is transformed into a cipher message by operating on each bit of clear information with a complex modulo-two ... | 03/25/1980 |
| 4195200 | Key controlled block-cipher cryptographic system employing a multidirectional shift matrix A cryptographic system for enciphering a block of binary data under the control of a unique key consisting of a set of binary symbols. A clear message represented in binary data format is transformed into a cipher message (and vise versa) by operating on ... | 03/25/1980 |
| 4177355 | Array device for data scrambling This specification describes an array logic chip that can be used to encipher and decipher binary data. The array logic chip contains a matrix of input and output lines with the input lines divided into groups that are each addressed by a different decode... | 12/04/1979 |
| 4172213 | Byte stream selective encryption/decryption device An apparatus for insertion in a communications line for providing message secrecy within a significant portion of existing communications networks. At the transmitter end, the apparatus receives messages from the communications line, enciphers them and re... | 10/23/1979 |
| 4160120 | Link encryption device An apparatus for insertion in a communications line for providing both message integrity and message secrecy within a significant portion of existing communications networks. At the transmitter end, the apparatus receives messages from the communications ... | 07/03/1979 |
| 4123747 | Identity verification method and apparatus An improved method for verifying the identity of a prospective terminal user presenting an identification card or a credit card and a memorized personal identification number. Only part of the information necessary to correlate an account number to a pers... | 10/31/1978 |
| 4074066 | Message verification and transmission error detection by block chaining A message transmission system for the secure transmission of multi-block data messages from a sending station to a receiving station. The sending station contains cryptographic apparatus operative in successive cycles of operation during each of which an input... | 02/14/1978 |
| 4004089 | Programmable cryptic device for enciphering and deciphering data An encrypter for encoding and decoding data, wherein clear text data to be encoded is logically combined with a portion of a non-linear pseudo-random bit sequence signal to provide a partially encoded signal. The bit sequence of the non-linear pseudo-rand... | 01/18/1977 |
| 3962539 | Product block cipher system for data security A device for ciphering a block of data bits under control of a cipher key. The cipher device performs a ciphering process for the block of data by carrying out an operation in which the block of data bits is first expanded by duplicating predetermined one... | 06/08/1976 |
| 3958081 | Block cipher system for data security A device for ciphering message blocks of data bits under control of a cipher key. The cipher device performs an enciphering process for each message block of data by carrying out a predetermined number of iteration operations in the first of which a first... | 05/18/1976 |
