Networks Ethernet conquered enormous popularity because of grow prettier capacity, to simplicity of installation and acceptable cost of net equipment.

However, technology Ethernet is not deprived of essential deficiencies. Basic of them consists of the lack of defense of the transferred information. The computers, connected to network Ethernet, can intercept the information, addressed to its neighbors. Reason to that is accepted in networks Ethernet the so-called broadcasting mechanism of the exchange of the communications

During the guarantee of safety of the information of the service lives of personal computers much depends of selection of the methods of the protection of information on the floppy disks (diskettes) from the unsanctioned copying.

The authors of this article besides a classical change in the structure diskettes (tyings to the time parameters of reading and record, nonstandard marking of paths and change in the distance) propose to use methods of coding the information, which is stored on the flexible disk, in accordance with the algorithm of cryptographic conversion according to GOST 28147-89 in the regime of with the feedback.

The algorithm of cryptographic conversion is intended for the apparatus or program realization, he satisfies cryptographic requirements, but his possibilities do not set limitations on the application.

Pluses and minuses

Last years were marked by the expansion of the possibilities of using the information resources, accessible through network Internet. Many organizations today join to it local networks in order through its working stations to obtain access to the internetwork information resources. Internet it became the vitally necessary and constantly growing global network, which changed the means of life and thinking of many people. But at the same time it gave birth to many problems, in the first place, connected with the organization of safety, since the most common protocols, which are used for the exchange of data carriers, do not provide protection from the interception of data. Several reasons for the prevailing situation:

It became the rule: every time that is let out the new version of program product, substantially - now and then to many megabytes - run up its requirements for the dimensions of computer memory. When such demands exceed the available memory, it is necessary to buy additional. When further extension is impossible, then it is necessary to acquire new, more powerful computer or working station. But do go large productivity and extended functionality into the foot all by the being increased demands to the computational resources? In the majority of the cases the answer will be is not.