The Way by Estimating the Variation of TCP Packet Round Trip Time to The Way by Estimating the Variation of TCP Packet Round Trip Time to

The Way by Estimating the Variation of TCP Packet Round Trip Time to Detect Stepping-Stone Intrusion

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Source: Applied Computer Security Associates (ACSA)

Date: January 2008

Type: White Paper

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Overview: A common way to detect stepping-stone intrusion is to estimate the number of hosts compromised by computing the length of a connection chain. This paper proposes Std-ratio approach to detect stepping-stone intrusion, as well as Std-clustering method to find TCP packet round trip time of a connection chain. Std-ratio is method to use ratio between standard deviation of round trip time gaps to downstream neighbor host and to end side of connection chain. Std-clustering is a method to determine the round trip time cluster by comparing standard deviation of each candidate cluster.

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