Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 5406628 | Public key authentication and key agreement for low-cost terminals A method for achieving mutual authentication and session key agreement between a first party 12 which has minimal computational resources and a second party 18 which has substantial computational resources utilizes a modular square root operation for cert... | 04/11/1995 |
| 5402490 | Process for improving public key authentication An environment which includes a communications network, user terminals, and an authentication center provides communication services only to legitimate subscribers. The authentication center receives an equipment ID for each terminal, generates a series o... | 03/28/1995 |
| 5390252 | Authentication method and communication terminal and communication processing unit using the method In a first processing mode for a first communication request, a communication processing unit responds to a communication request signal from a communication terminal to acquire an authentication key Ka corresponding thereto from a storage, generates piec... | 02/14/1995 |
| 5375169 | Cryptographic key management method and apparatus A system for the secure communication of a message from a transmitting user to a receiving user using a split key scheme. Each user generates a key component using a cryptographic engine. The key component is a pseudorandom sequence of bits with an append... | 12/20/1994 |
| 5365589 | Method and apparatus for encryption, decryption and authentication using dynamical systems A method and apparatus provide encryption, decryption and authentication of messages using dynamical systems. The method and apparatus preferably operate on an information stream which may comprise message information, authentication information, and rand... | 11/15/1994 |
| 5351293 | System method and apparatus for authenticating an encrypted signal A cryptographic communications system includes a method and apparatus for exchanging messages between a user terminal, containing a secret key, and an operations center wherein each party authenticates signals received from the other party before any othe... | 09/27/1994 |
| 5345506 | Mutual authentication/cipher key distribution system A communication network and its user i has a device for implementing a common key cryptosystem, an identifier of the user i represented by IDi which is made public in the network, an authentication key of a user i represented by Si i... | 09/06/1994 |
| 5341426 | Cryptographic key management apparatus and method A method for establishing a secure communications link between first and second terminals includes a step of exchanging a first message. The first message contains information describing encryption devices and communications modes available within the ter... | 08/23/1994 |
| 5299263 | Two-way public key authentication and key agreement for low-cost terminals A method for achieving mutual authentication and session key agreement between a first party 12 which has minimal computational resources and a second party 18 which has substantial computational resources utilizes a modular square root operation for cert... | 03/29/1994 |
| 5297208 | Secure file transfer system and method This invention is a system and method for securely and robustly transferring a file from one computer to another without having a prearranged encryption key. Data is transferred by first generating some random numbers on each computer and undertaking some... | 03/22/1994 |
| 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 |
| 5241599 | Cryptographic protocol for secure communications A cryptographic communication system. The system, which employs a novel combination of public and private key cryptography, allows two parties, who share only a relatively insecure password, to bootstrap a computationally secure cryptographic system over ... | 08/31/1993 |
| 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 |
| 5216715 | Key distribution in public communication networks taking account of security gradations A public communication system for a plurality of communication services (ISDN) has an arrangement for the authentification of the subscriber stations (TLN A, TLN B) for the key transmission. For a first security level this authentification arrangement has... | 06/01/1993 |
| 5196840 | Secure communications system for remotely located computers A system for determining when a remote computer user is authorized to communicate with a host computer and to establish a ciphering key to be used for the communications session. A random number is generated at the host computer, ciphered under the user's... | 03/23/1993 |
| 5179591 | Method for algorithm independent cryptographic key management An apparatus for secure communications contains a controller for automatically selecting one of several data ciphering means utilizing one of a plurality of ciphering algorithms common to transmitting and receiving terminals. A transmitting means for tran... | 01/12/1993 |
| 5146500 | Public key cryptographic system using elliptic curves over rings The cryptographic system comprises at least one encryption station, one decryption station and a trapdoor generator. The trapdoor generator comprises means for selecting r distinct prime numbers pi, generating a modulus m that is a product of the prime nu... | 09/08/1992 |
| 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 |
| 4956863 | Cryptographic method and apparatus for public key exchange with authentication A technique for use in a public key exchange cryptographic system, in which two user devices establish a common session key by exchanging information over an insecure communication channel, and in which each user can authenticate the identity of the other... | 09/11/1990 |
| 4876716 | Key distribution method A key distribution method and system for distributing a key over an insecure communication channel between first and second systems. Both first and second systems generate respective random numbers, calculate key distribution codes based on that random nu... | 10/24/1989 |
| 4783798 | Encrypting transponder An encrypting transponder provides data security for transmissions between a terminal and a remote computer, network or terminal. The transponder provides positive user and terminal identification before access to a remote computer file is permitted, and ... | 11/08/1988 |
| 4720859 | Method and system for the mutual encyphered indentification between data communicating stations and stations for use with such method and system A method for transmitting ciphered information between two stations while using session keys. According to the method a mutual identification of the stations (AK, A; A,B) is obtained while using an identification device (ID) comprised in each station. Num... | 01/19/1988 |
| 4677670 | Paired-secure message identification controller for computers and the like A paired-secure message identification controller for computers and the like is provided which yields secure communications between two computers with the invention installed. The message originator provides a guest identification module to the recipient ... | 06/30/1987 |
| 4649233 | Method for establishing user authenication with composite session keys among cryptographically communicating nodes A method for authenticating nodes/users and in protecting data flow between nodes. This is facilitated by creating a dialogue involving authenticated encryption among the nodes. During each session, a key for use in cryptographic conversion is constructed... | 03/10/1987 |
| 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 |
| 4424414 | Exponentiation cryptographic apparatus and method A cryptographic system transmits a computationally secure cryptogram that is generated from a secret transformation of the message sent by the authorized transmitter; the cryptogram is again transformed by the authorized receiver using a secret reciprocal... | 01/03/1984 |
| 4200770 | Cryptographic apparatus and method A cryptographic system transmits a computationally secure cryptogram over an insecure communication channel without prearrangement of a cipher key. A secure cipher key is generated by the conversers from transformations of exchanged transformed signals. T... | 04/29/1980 |
