| 5224166 |
System for seamless processing of encrypted and non-encrypted data and instructions |
| Jun-29-1993 |
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... |
| 5222140 |
Cryptographic method for key agreement and user authentication |
| Jun-22-1993 |
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... |
| 5159633 |
Multimedia network system |
| Oct-27-1992 |
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... |
| 5150411 |
Cryptographic system allowing encrypted communication between users with a secure mutual cipher key determined without user interaction |
| Sep-22-1992 |
A secret key generator for a trusted authority means in a cryptographic system comprising means for receiving a publicly-known user identity ID.sub.A for a user A; and further comprising secret key generator... |
| 5144665 |
Cryptographic communication method and system |
| Sep-1-1992 |
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... |
| 5136642 |
Cryptographic communication method and cryptographic communication device |
| Aug-4-1992 |
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... |
| 5003593 |
Teleconferencing method for a secure key management system |
| Mar-26-1991 |
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.... |
| 4949379 |
Process for encrypted information transmission |
| Aug-14-1990 |
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... |
| 4903296 |
Implementing a shared higher level of privilege on personal computers for copy protection of software |
| Feb-20-1990 |
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... |
| 4888801 |
Hierarchical key management system |
| Dec-19-1989 |
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... |
| 4771461 |
Initialization of cryptographic variables in an EFT/POS network with a large number of terminals |
| Sep-13-1988 |
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... |
| 4736423 |
Technique for reducing RSA Crypto variable storage |
| Apr-5-1988 |
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... |
| 4658093 |
Software distribution system |
| Apr-14-1987 |
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... |
| 4634807 |
Software protection device |
| Jan-6-1987 |
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... |
| 4578531 |
Encryption system key distribution method and apparatus |
| Mar-25-1986 |
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... |
| 4351982 |
RSA Public-key data encryption system having large random prime number generating microprocessor or the like |
| Sep-28-1982 |
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... |
