Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1994-12-14
1996-09-17
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 10, 380 16, 380 15, H04L 2904
Patent
active
055576770
DESCRIPTION:
BRIEF SUMMARY
AREA OF APPLICATION
The present invention refers to a procedure and a device for transmitting information, carried out by and comprised of a number of electronic modules and functions in accordance with the description contained in the introduction to patent claim 1.
STATE OF THE ART
Today, substantial quantities of information are transmitted by means of electronic devices and networks. This information may be in various forms--written in the form of alphanumeric characters, as still or moving pictures, or as sound in the form of natural or artificial speech--and may be generated with the aid of devices such as printers, plotters, cameras of various types and sound recording equipment. Networks designed to transmit electrical or optical impulses across greater or lesser distances are used for transmission purposes. For transmission by this means, the generated information must be converted into an suitable train of pulses in accordance with the coding system selected for transmission purposes, while these pulses must, when received, be decoded to produce useful information, corresponding to that transmitted, for use for the intended purpose.
Transmission and reception may take place in real time; in other words, coding may be carried out simultaneously with transmission and decoding simultaneously with reception. In many instances, however, the originally generated information may be stored in coded form in an electronic or optical memory, from which it is transmitted at a later time. In this case, the information stored in the memory often undergoes processing, such as readdressing or compression, allowing the subsequent utilisation time of the transmission channel to be shortened. The information may also be stored in similar manner at the receiving end for production in the desired form at a later time, following processing and/or decompression, if necessary. The information is usually stored on magnetically readable disks or tapes, or in optically readable, digital form (CD technology).
Clear distinction is made between a number of systems in the method of information transmission and storage described above. Thus, transmitter, receivers, transmission methods and networks which are completely different in technical terms are used to handle different types of original information, and for different application types and user groups.
Information directed selectively to a specific receiver or a limited group of receivers is usually transmitted over the telephone network, including both wire-guided and unguided (wireless) transmission from ground stations and/or satellites. As is known, speech is transmitted mostly in real time and interactively; in other words, by interchange of transmission and reception on both sides. The same telephone network is used for transmitting text over long distances. In this case, however, completely different transmission and receiving devices are employed--telex is used for written text alone, while the telecopier (or telefax machine) is used for text and images when the required picture quality is not especially high. Special image transmission devices are also used on the telephone network to transmit high-quality stills and colour pictures.
As an alternative, the transmission of text and images generated by computer, in which the material stored in the computer memory is transmitted directly without the need to produce a printed document, is now becoming more common. Reception may also take the form of direct storage of the information in a computer memory for production of the requisite documents, following processing, if required. Like direct transmission by telex or telefax, this method permits two-way communication inasmuch as a device which can be used for both transmission and reception is normally installed at each end. However, genuine interactivity, such as communication in the form of a conversation, is not possible, apart from the fact that certain databases are designed to permit a two-way exchange of queries and responses.
Completely different means, su
REFERENCES:
patent: 4829558 (1989-05-01), Welsh
patent: 4962529 (1990-10-01), Saeki et al.
patent: 5381481 (1995-01-01), Gammie et al.
Cain David C.
Info Development & Patent AB
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