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Friday, 23 September 2005 |
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Flood SYN- packets - the most known method "to drive in" information channel. Let us recall how works TCP/IP in the case entering of shchikh of connections. System answers arrived C-paket S-SYN/cACCK- packet, it converts session to state SYN_.RECEIVED and will bring in it in the turn. If in the course of preset time from the client S, does not arrive, connection is moved away from the turn, otherwise the connection is transferred into state ESTABLISHED.When the turn of incoming trunks is already filled on RFC, and system obtains SYN- packet, which invites to the installation of connection, it will be silently ignored. |
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Friday, 23 September 2005 |
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During floods attacks occurs sending of a large quantity on the attacked system ICMP (most frequently) or UDP packets, which do not bear the useful information (rubbish). As a result occur the decrease of the bandwidth and the load of computer system by the analysis of the arrived useless packets and by the generation to them of answers. |
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Friday, 23 September 2005 |
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Hack - the class of attacks, utilized for investigating of operating systems, applications or protocols for the purpose of subsequent analysis of obtained information to the object of the presence of vulnerabilities, for example, Ports scan, which can be also carried to little effective DOS- attack. The revealed vulnerabilities can be used by hacker for the realization of the unsanctioned access to the system or for selecting the most effective DOS- attack.
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Friday, 23 September 2005 |
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Class of the attacks, which lead to the refusal to the maintenance. During such attacks occurs the increased expenditure of the resources of processor and the decrease of the channel of the spacing possibility of communication channel, which can bring in to the strong retarding of the work of entire computer system, separate tasks or generally to the complete stop of the tasks of user. Example. You send into the store after the bread, and there two hours ago hooligans beat all glass and entire personnel it was occupied with their harvesting; was erected the enormous turn of pensioners i.e. chance to pass without the turn when store it will be opened near the entrance into the store is not. DOS To attacks include Floods, ICMP flooding, Identification flooding and others. |
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Friday, 23 September 2005 |
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The safety of information can be disrupted in two basic cases: with obtaining of the unsanctioned access to information and disturbance of the functioning OF COMPUTER(S) the system for protection from these threats includes the following basic elements: the protection OF SODAS and its equipment, organizational measures for the guarantee of safety of information, the protection of operating system, it is file, terminals and communication channels. it is necessary to keep in mind that all types of protection are interconnected and with the fulfillment of its functions at least of one of them it reduces on there is no effort of others. |
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Friday, 23 September 2005 |
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A concrete user in accordance with its demand reduces these procedures to the mutual identification of user and system and the establishment of the fact of the permissibility of the use of resources. Control of access solves the problem of the permission of maintenance by the interrogator system of user and obtaining of access to the files of data. Means of control of access ensure the protection of information both from the no automated use and from the unsanctioned maintenance by system. Protection realizes by the procedures of identification, establishment of authenticity and registering the rotation. |
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Friday, 23 September 2005 |
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The problems of the guarantee of safety
considerably are complicated during the organization of machine
information processing under the conditions VTS of the collective use,
the information of different designation and belonging is processed and is accumulated. Among the problems of the guarantee of safety of information it is possible
to isolate questions of theory, organization and engineering
solutions, which require specific approach already at the stage of the
preliminary design of SODAS.
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