Converse solved multidimensional Hash table method

A technology of one-dimensional hash table and reverse solution, which is applied in the field of multi-dimensional hash table for reverse solution, and can solve problems such as irreversible solution

Inactive Publication Date: 2009-06-24
XI AN JIAOTONG UNIV
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Problems solved by technology

[0030] The purpose of the present invention is to solve the problem of irreversible solution in the existing multidimensional hash tabl

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  • Converse solved multidimensional Hash table method
  • Converse solved multidimensional Hash table method
  • Converse solved multidimensional Hash table method

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Embodiment Construction

[0052] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0053] The data flow model that multidimensional hash table processing provided by the present invention is as follows:

[0054] Let the input data stream be I=a 1 , a 2 ,...a i , data item a i Arrive in chronological order. data item a i =(k i , u i ), where the key value k i ∈ {0, 1, ..., N-1}, u i is the key value k i The corresponding update value, u i The value can be positive or negative.

[0055] The data structure of the multidimensional hash table provided by the present invention is as follows:

[0056] The multidimensional hash table provided by the present invention is composed of H hash tables T[j][ ] (1≤j≤H), and the corresponding hash function is as follows:

[0057] h j (x)≡a j x+b j modm j , 1≤j≤H

[0058] where m 1 ,...,m H , a 1 ,...,a H , b 1 ,...,b H All are positive integers. m 1 ,...,m H Pairwise coprime, for ...

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Abstract

Disclosed is a multi-dimensional hash table method for inverse solution, which is widely applied to real-time measurement and monitoring in large scale network. As the inverse solution is unavailable for multi-dimensional hash table technology in prior art, when network traffic abnormity is detected through multi-dimensional hash table, only the corresponding position of abnormity in multi-dimensional hash table is acquired, and the abnormity is unable to be accurately positioned on corresponding network traffic rapidly; so great obstacle is brought to the application of multi-dimensional hash table technology in large-scale network real-time monitoring field. The invention adopts the hash function group which is the key part of multi-dimensional hash table to solve the inverse solution problem. The corresponding inverse solution process is simple, efficient and has accurate results.

Description

technical field [0001] The invention belongs to a method for detecting and locating large-scale network traffic anomalies in the field of data flow analysis and processing, and in particular relates to a multidimensional hash table method for reverse solution. Background technique [0002] With the development and application of computer network technology, network bandwidth and network traffic have increased rapidly, and massive network traffic data has brought great challenges to the real-time and effective measurement and monitoring of large-scale networks. Real-time effective network measurement is of great significance to network management, traffic planning, and network billing. For example, network operators need to count network bandwidth usage or traffic statistics for billing, and network managers need to update routers based on traffic statistics. routing table, and through the effective analysis of network traffic to discover and deal with abnormal network events...

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Application Information

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IPC IPC(8): H04L12/24H04L12/26H04L12/56
Inventor 管晓宏王平辉秦涛
Owner XI AN JIAOTONG UNIV
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