Quotables
"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."
Simon Newcomb, astronomer ; Said in 1902, less than two years before the first flight at Kitty Hawk
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 |
| 5734720 | System and method for providing digital communications between a head end and a set top terminal 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 or other data may be modified to reflect actual usag... | 03/31/1998 |
| 5701343 | Method and system for digital information protection A digital information protection scheme using an improved security protocol. In a system in which a user makes an access to a digital information provided by an information center by connecting a computer card owned by the user to an information terminal ... | 12/23/1997 |
| 5661806 | Process of combined authentication of a telecommunication terminal and of a user module The terminal and the user module are authenticated in a combined manner on the basis of an authentication key calculated on the one hand by the terminal and on the other hand by the network. A session key is firstly calculated by the user module on the ba... | 08/26/1997 |
| 5651066 | Cipher key distribution system effectively preventing illegitimate use and charging of enciphered information A method and a system for cipher key distribution realizing an effective prevention of the illegitimate use and the illegitimate charging. A key request signal containing a first random number generated at each user terminal is transmitted from each user ... | 07/22/1997 |
| 5625690 | Software pay per use system A pay per use system for of the unauthorized use of computer software. An encryption program encodes original software to produce secured software. The encoding is accomplished by using cryptographic techniques. In order to use the software, a user must c... | 04/29/1997 |
| 5557678 | System and method for centralized session key distribution, privacy enhanced messaging and information distribution using a split private key public cryptosystem A encryption method and system using split key public encryption. A first and second user private encryption key and a corresponding first and second user public encryption key are generated. The first and second user private encryption keys are divided i... | 09/17/1996 |
| 5517567 | Key distribution system A system for securely distributing a communications key from a master unit to a remote unit for use in cryptographic communications between the master and remote units employs first and second secret numbers stored in both the master and remote units, and... | 05/14/1996 |
| 5509071 | Electronic proof of receipt A system for use in an electronic cryptosystem for providing a sender with electronic proof of receipt by an intended recipient of an electronic artifact is disclosed. The process is initiated by the recipient's requesting an artifact from the sender, who... | 04/16/1996 |
| 5455863 | Method and apparatus for efficient real-time authentication and encryption in a communication system Radio frequency based cellular telecommunication systems often require both subscriber units and communication units of a fixed network communication system to maintain secret data which may be used to verify authenticity as well as provide encrypting var... | 10/03/1995 |
| 5325433 | Encryption communication system An encryption communication system including: a communication center having at least a key information generating unit for generating key generating information used for encryption communication; and a plurality of user computers, each interconnected by a... | 06/28/1994 |
| 5265164 | Cryptographic facility environment backup/restore and replication in a public key cryptosystem 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 personalizes the first cryptographic facility. The sys... | 11/23/1993 |
| 5251258 | Key distribution system for distributing a cipher key between two subsystems by one-way communication In a key distribution system comprising a first subsystem (11), a second subsystem (12), and a public file (13), the first subsystem transmits distribution information (IDA, YA) to the second subsystem via a communication channel (16... | 10/05/1993 |
| 5224166 | System for seamless processing of encrypted and non-encrypted data and instructions A data processing system includes an internal cache memory in a secure physical region that is not accessible to a user of the system. An external memory is positioned outside of the secure physical region and stores encrypted and non-encrypted (i.e., pla... | 06/29/1993 |
| 5222140 | Cryptographic method for key agreement and user authentication Protocols for session key agreement and authentication in a communication system such as a portable communication system make use of public key cryptographic techniques. The protocols of the present invention are especially suited for use in a portable co... | 06/22/1993 |
| 5159633 | Multimedia network system There is disclosed a multimedia network system for transmitting real-time communication type information such as a television video signal and storage type information such as a computer file using at least one transmission path. The real-time communicati... | 10/27/1992 |
| 5150411 | Cryptographic system allowing encrypted communication between users with a secure mutual cipher key determined without user interaction A secret key generator for a trusted authority means in a cryptographic system comprising means for receiving a publicly-known user identity IDA for a user A; and further comprising secret key generator means for transforming the publicly-known... | 09/22/1992 |
| 5144665 | Cryptographic communication method and system A cryptographic communication method and system for performing cryptographic communication between a host computer and a given one of plural terminals connected to the host computer by way of a communication network by using a data key designated by the g... | 09/01/1992 |
| 5136642 | Cryptographic communication method and cryptographic communication device A cryptographic communication method comprises a step for carrying out cryptographic communication between a sending station and one or more receiving stations by using (1) a ciphertext formed by encrypting a unit of sending information under the interven... | 08/04/1992 |
| 5003593 | Teleconferencing method for a secure key management system A secure teleconferencing method for a key management system is shown. This method directly establishes a secure teleconference among a number of terminals without the intervention of a certifying authority. The terminals of this system have been previous... | 03/26/1991 |
| 4949379 | Process for encrypted information transmission A secure voice transmission system is disclosed in which enemy interception problems are overcome by analyzing the speech characteristics of a password from a known operator. Some of the voice characteristics remain in the central computer, while others a... | 08/14/1990 |
| 4903296 | Implementing a shared higher level of privilege on personal computers for copy protection of software Method and apparatus which restricts software, distributed on magnetic media, to use on a single computing machine. The original medium is functionally uncopyable, until it is modified by the execution of a program stored in a tamper proof co-processor wh... | 02/20/1990 |
| 4888801 | Hierarchical key management system A hierarchical key management system includes a number of secure terminals. These terminals provide secure access to a corresponding number of users. A user inserts a security activation device or key into the secure terminal to access a secure connection... | 12/19/1989 |
| 4771461 | Initialization of cryptographic variables in an EFT/POS network with a large number of terminals A procedure is disclosed for initializing with security and integrity a large number of terminals in an EFT/POS network with cryptographic variables. Each terminal in the network is provided with a cryptographic facility which performs the necessary crypt... | 09/13/1988 |
| 4736423 | Technique for reducing RSA Crypto variable storage A technique for reducing RSA (Rivest, Shamir and Adleman algorithm) cryptovariable key from 1200 bits (400-bit public key, 400-bit secret key and 400-bit modulus) to 106 bits makes feasible the storage of the RSA algorithm parameters on current magnetic s... | 04/05/1988 |
| 4658093 | Software distribution system Software (programs, videogames, music, movies, etc.) can be authorized for use a given number of times by a base unit after which the base unit (computer, videogame base unit, record player, videorecorder or videodisk player) cannot use that software unti... | 04/14/1987 |
| 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 |
| 4578531 | Encryption system key distribution method and apparatus Encryption systems typically rely on the distribution of cipher keys between terminals for scrambling and unscrambling transmitted messages. Elaborate security precautions are necessary to protect the cipher keys since a compromise of the key could result... | 03/25/1986 |
| 4351982 | RSA Public-key data encryption system having large random prime number generating microprocessor or the like A public-key data encryption system employing RSA public-key data encryption including a message encrypter capable of encrypting messages using a non-secret encryption key, a transmitter-receiver coupled to the message encrypter which transmits or receive... | 09/28/1982 |
