| 5825888 |
Descrambling device |
| Oct-20-1998 |
In a packet analyzing circuit, first and second key data are detected and stored in respective first and second key data registers. First and second key generation circuits generate first and second keys... |
| 5809148 |
Decryption of retransmitted data in an encrypted communication system |
| Sep-15-1998 |
The method generally includes the steps of receiving (201) a message (100) comprising a message indicator (101) and a plurality of encrypted blocks (103 through 111). When at least one block of the plurality... |
| 5799090 |
pad encryption method and software |
| Aug-25-1998 |
A pad encryption software architecture includes space on a floppy for storing the pad to be used with the encryption software. The pad is XOR generated with random numbers subject to redetermined offsets.... |
| 5798711 |
High throughput embedded code hopping system with bypass mode |
| Aug-25-1998 |
A system for monitoring and controlling an area comprising a controller for controlling system operational functions; at least one remote control transmitter for transmitting at least one system command... |
| 5778069 |
Non-biased pseudo random number generator |
| Jul-7-1998 |
A computer-implemented pseudo random number generator includes an input device to assemble multiple classes of bits from multiple sources into an input bit string. The multiple classes of bits include... |
| 5774065 |
Remote control system and method using variable ID code |
| Jun-30-1998 |
In a remote control system, each time a transmission code is transmitted, a rolling code having a prescribed bit configuration is cumulatively varied. An operation process is performed between each bit... |
| 5768379 |
System for the checking of limited access to authorized time slots renewable by means of a portable storage device |
| Jun-16-1998 |
The invention relates to systems for checking access limited to authorized time slots renewable by means of a portable storage device. The system comprises, for this purpose, an element (LE) producing... |
| 5768383 |
Authorized cellular voice messaging and/or analog or digital data communication access and verification control system |
| Jun-16-1998 |
This invention relates to cellular voice messaging and/or analog or digital data messaging systems that utilize encryption and employ encrypted seed number signals to make it more difficult to make unauthorized... |
| 5764766 |
System and method for generation of one-time encryption keys for data communications and a computer program product for implementing the same |
| Jun-9-1998 |
A system and method and computer program product for encrypting data communications comprising the generation of a salt at a data transmitting system and combination of the salt with a primary encryption... |
| 5748734 |
Circuit and method for generating cryptographic keys |
| May-5-1998 |
A circuit for, and method of, generating a cryptographic key at a communications node. The circuit includes: (1) communications circuitry for communicating a first seed during a first communications session... |
| 5734720 |
System and method for providing digital communications between a head end and a set top terminal |
| Mar-31-1998 |
A system and method for scheduling the receipt of desired movies and other forms of data from a network. Feedback paths are provided so that customer's profiles and/or the profiles of the video programs... |
| 5733047 |
Enciphering system applicable to various keyless entry systems |
| Mar-31-1998 |
An enciphering system comprises a transmitter (1) and a receiver (2) communicatable with each other and incorporated in a keyless entry system. The transmitter (1) comprises a memory (11) for memorizing... |
| 5720034 |
Method for secure key production |
| Feb-17-1998 |
A method for exchanging a secure slave key between an agent and a manager which are connected by an unsecured digital computer network. A master key is provided, which is known to both the manager and... |
| 5708712 |
Vehicle security device with electronic use authorization coding |
| Jan-13-1998 |
The invention provides a vehicle security device utilizing a rapid encryption method which operates on the basis of a "one-way function" and which requires storage in the vehicle of at most one item of... |
| 5703948 |
Protected communication method and system |
| Dec-30-1997 |
A method and apparatus for transmitting encrypted messages between two units, by initializing the two units with respect to each other, and thereafter transmitting the messages between the two units encrypted... |
| 5694473 |
Decryption of retransmitted data in an encrypted communication system |
| Dec-2-1997 |
A method of decrypting retransmitted parts of a message includes receiving (201) a message comprising encryption synchronization and a plurality of encrypted blocks. Until a first block of the plurality... |
| 5680131 |
Security system having randomized synchronization code after power up |
| Oct-21-1997 |
A transmitting unit of a wireless security system having randomized successive ("rolling") verification codes transmits a different synchronization code each time that the transmitter unit is powered up.... |
| 5661804 |
Trainable transceiver capable of learning variable codes |
| Aug-26-1997 |
A trainable transceiver for learning and transmitting an activation signal that includes a rolling or other variable code for remotely actuating a device, such as a garage door opener. The trainable transceiver... |
| 5649014 |
Pseudorandom composition-based cryptographic authentication process |
| Jul-15-1997 |
The pseudorandom process iteratively applies a selected CRC encryption process on the information to be encrypted. The encryption process is selected by testing one of the digits comprising the number... |
| 5646996 |
Automatic resynchronization of transmitter in the event of corrupted memory |
| Jul-8-1997 |
Loss of synchronization between transmitter and receiver of a remote entry system is detected during the communication sequence between transmitter and receiver, by generating a checksum of the authentication... |
| 5631962 |
Circuit and method of encrypting key validation |
| May-20-1997 |
An electronic key validation process increases security by encrypting the security access codes. A key (10) receives data having a hidden polynomial select code and polynomial seed from a host (12). A... |
| 5619573 |
Vehicle security device with electronic use authorization coding |
| Apr-8-1997 |
The invention provides a vehicle security device with an electronic use-authorization coding arrangement for identifying authorized access to the vehicle. The vehicle security device utilizes an encryption... |
| 5604488 |
Remote control security system |
| Feb-18-1997 |
A remote control keyless security system for remotely controlling the locking and unlocking control functions of a lock mounted on a vehicle or the like. A receiver is mounted on a vehicle proximate to... |
| 5600724 |
Method for the protection of messages transmitted using public communication lines |
| Feb-4-1997 |
A method for the protection of messages transmitted using public communication lines uses dynamic vectors that change in accord with the content of the messages. Nobody, except the one to whom an encrypted... |
| 5600723 |
Cryptographically secure electric fuel pump system |
| Feb-4-1997 |
A vehicle anti-theft system in the form of a mechanically interengagable electronic key and lock includes stored key and vehicle identifiers in both the key and in the lock. A random number is generated... |
| 5598475 |
Rolling code identification scheme for remote control applications |
| Jan-28-1997 |
A remote control access system uses a transmitter and a receiver. The transmitter generates an encrypted identification code which the receiver decrypts and grants access to the system if the decrypted... |
| 5598476 |
Random clock composition-based cryptographic authentication process and locking system |
| Jan-28-1997 |
The first and second devices exchange randomly generated messages that are used in a composition-based encryption/decryption process. At least one of the randomly generated messages is, itself, encrypted... |
| 5592554 |
Method for data security in a digital telecommunication system |
| Jan-7-1997 |
For data security in a digital telecommunication system having a plurality of subscriber equipment, a public key is respectively calculated from a secret key prescribed in a first subscriber equipment.... |
| 5590200 |
Apparatus and method for securing communication systems |
| Dec-31-1996 |
A hacking prevention system and method wherein the descrambler receives a data stream including a series of authorization packets and a series of corresponding offset values. A random number is generated... |
| 5588062 |
Secure communication setup method |
| Dec-24-1996 |
A call is connected between secure terminals (16) through a network (12). If a network address for the call is included on an approved list (46), a secure call setup procedure (54) is performed automatically.... |
| 5574789 |
Encryption communication method and terminal device for encryption communication |
| Nov-12-1996 |
In a calling facsimile, if an operator sets an encryption communication mode, a random number sequence is generated by a random number generating section 15. A control section 11 produces an encryption... |
| 5561713 |
Apparatus for scrambling and descrambling a video signal |
| Oct-1-1996 |
A scrambler for scrambling a composite video signal comprises a scrambling data generator for generating a number of scrambling data. Each of the scrambling data is added to each of a corresponding number... |
| 5557676 |
Authentication for analog communication systems |
| Sep-17-1996 |
A method and system for authenticating the identification of mobile stations during system access is disclosed. A modified electronic serial number, including an encoded COUNT value, sent by the mobile... |
| 5533128 |
Pseudo-random transposition cipher system and method |
| Jul-2-1996 |
In a pseudo-random transposition cipher system and method, sender and receiver each have sets of corresponding identical pseudo-random number generators. To encrypt a message, the sender generates a pseudo-random... |
| 5517187 |
Microchips and remote control devices comprising same |
| May-14-1996 |
Encoder and decoder microchips suitable for use in remote control devices, are disclosed. The encoder microchip comprises means for performing an encoding function on an identification number embedded... |
| 5508692 |
Central locking installation for a motor vehicle |
| Apr-16-1996 |
The invention relates to a central locking installation for a motor vehicle, having a transmitter (2), operating as a key, and a receiver (4), operating as a lock. When the transmitter (2) is actuated... |
| 5508687 |
Remote control, in particular for a locking device |
| Apr-16-1996 |
A remote control for a locking device, especially in a motor vehicle, including a control or operating unit for the transmitting of key words to the evaluating circuit of a reading unit fora comparison... |
| 5506905 |
Authentication method for keyless entry system |
| Apr-9-1996 |
A system for remotely controlling a desired door locking or other function in a vehicle or other protected environment has a transmitter and receiver for communicating a message including a sequence number,... |
| 5500888 |
Cordless telephone security code initiation and prevention system |
| Mar-19-1996 |
A method and structure for increasing the security of a cordless telephone system by automatically altering the security code information stored in the cordless telephone handset and base unit. Thus, without... |
| 5488660 |
Electronic combination lock utilizing a one-time use combination |
| Jan-30-1996 |
A combination lock is described where the combination that is used to open the lock is generated on a separate computer system using information that is contained in the lock and a series of steps that... |
| 5488358 |
Electronic combination lock with closure and locking verification |
| Jan-30-1996 |
A lock is described which has the capability to generate or encrypt a close number which is then displayed to the operator of the lock to be used to verify the locking of the lock. This number must be... |
| 5465300 |
Secure communication setup method |
| Nov-7-1995 |
A call is connected between secure terminals (16) through a network (12). If a network address for the call is included on an approved list (46), a secure call setup procedure (54) is performed automatically.... |
| 5455862 |
Apparatus and method for encrypting communications without exchanging an encryption key |
| Oct-3-1995 |
An encryption/decryption unit (EDU) and method for determining a data encryption key used in encrypting and decrypting data transmitted over a non-secure communication link. Each EDU includes a central... |
| 5444781 |
Method and apparatus for decryption using cache storage |
| Aug-22-1995 |
A method and apparatus for decryption using cache storage wherein imported ciphertext is decrypted to produce unencrypted plaintext data. As a communication sequence containing an initialization vector... |
| 5442341 |
Remote control security system |
| Aug-15-1995 |
A remote control keyless security system is presented herein for remotely controlling locking means mounted on a vehicle. A receiver is mounted on a vehicle. A remote transmitter includes a plurality of... |
| 5420925 |
Rolling code encryption process for remote keyless entry system |
| May-30-1995 |
An encryption process for a rolling code of a remote keyless entry system. The encryption process makes use of a command code shift register, a security code shift register, and a sequence code shift register... |
| 5412730 |
Encrypted data transmission system employing means for randomly altering the encryption keys |
| May-2-1995 |
A modem suitable for transmitting encrypted data over voice-grade telephone line. The modem is implemented by the combination of integrated circuit components including a microprocessor, a serial communications... |
| 5384848 |
Encrypted virtual terminal equipment having initialization device for preventing reply attack |
| Jan-24-1995 |
An apparatus which encrypts data transferred through a network during a session between a client terminal and a server. The client terminal issues a channel establishment command to start the session and... |
| 5381481 |
Method and apparatus for uniquely encrypting a plurality of services at a transmission site |
| Jan-10-1995 |
Methods and apparatus are described for uniquely encrypting a plurality services at a transmission site and for decrypting selected services at a reception site while reducing the amount of encryption... |
| 5377270 |
Cryptographic authentication of transmitted messages using pseudorandom numbers |
| Dec-27-1994 |
An automobile door lock receiver module (30) and a plurality of keychain fob transmitter units (16) contain identification numbers, secret initial values, and secret feedback masks so as to authenticate... |
