Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 4458109 | Method and apparatus providing registered mail features in an electronic communication system The method and the apparatus provide a security feature in an electronic communication system which contains a first and a second terminal and a communication network. The first terminal is designed for sending a message to the second terminal. A security... | 07/03/1984 |
| 4453074 | Protection system for intelligent cards There is disclosed a protection system for intelligent cards. Each card has stored in it a code which is the encryption of a concatenation of a user secret password and a common reference text. The encryption is derived by an initialization terminal which... | 06/05/1984 |
| 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 |
| 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 |
| 4405829 | Cryptographic communications system and method A cryptographic communications system and method. The system includes a communications channel coupled to at least one terminal having an encoding device and to at least one terminal having a decoding device. A message-to-be-transferred is enciphered to c... | 09/20/1983 |
| 4399323 | Fast real-time public key cryptography In a public key cryptographic system (FIG. 1) for communicating securely over an insecure communication channel (3), a sender (1, 2) enciphers a data message (D) using a public enciphering knapsack key (H) to generate an enciphered message (SH)... | 08/16/1983 |
| 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 |
| 4306111 | Simple and effective public-key cryptosystem A public encryption key (c1, c2, r) in which r is the product of two relatively prime numbers, and in which c1 and r, as well as c2 and r, are relatively prime numbers, is used in an encryption algorithm The dec... | 12/15/1981 |
| 4218582 | Public key cryptographic apparatus and method A cryptographic system transmits a computationally secure cryptogram that is generated from a publicly known transformation of the message sent by the transmitter; the cryptogram is again transformed by the authorized receiver using a secret reciprocal tr... | 08/19/1980 |
| 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 |
| 4138057 | Card, system and method for securing user identification data A card having randomly-oriented optical fibers, and a system having a card reader for reading the card and having a keyboard for entering secret user-identification data, are disclosed for securing the user-identification data entered into the system. The... | 02/06/1979 |
