Read e-book online Computer Intrusion Detection and Network Monitoring: A PDF

By David J. Marchette

ISBN-10: 1441929371

ISBN-13: 9781441929372

ISBN-10: 1475734581

ISBN-13: 9781475734584

In the autumn of 1999, i used to be requested to coach a path on laptop intrusion detection for the dep. of Mathematical Sciences of The Johns Hopkins collage. That path used to be the genesis of this e-book. I were operating within the box for numerous years on the Naval floor conflict middle, in Dahlgren, Virginia, lower than the auspices of the SHADOW application, with a few investment via the workplace of Naval learn. In designing the category, i used to be involved either with giving an outline of the elemental difficulties in computing device protection, and with offering details that was once of curiosity to a division of mathematicians. therefore, the focal point of the path was once to be extra on tools for modeling and detecting intrusions instead of one on easy methods to safe one's laptop opposed to intrusions. the 1st job was once to discover a publication from which to educate. i used to be conversant in numerous books at the topic, yet they have been all at both a excessive point, focusing extra at the political and coverage facets of the matter, or have been written for protection analysts, with little to curiosity a mathematician. i needed to hide fabric that may attract the college individuals of the dept, a few of whom ended up sitting in at the path, in addition to supplying a few attention-grabbing difficulties for college kids. not one of the books out there on the time had an sufficient dialogue of mathematical matters relating to intrusion detection.

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Thus, Isof was not wrong in stating that no processes had the file foo open. The problem was that you asked the wrong question. Asking the right question is always a goal worth striving for. See the man pages for a more complete listing of the options and for many more examples. It should be noted that on some systems Isof will not show any files that are not opened by processes owned by the user. Thus, many of the preceding commands will not work (actually, they will work, but their output will not be complete).

More information on traceroute can be found in the man page. 6 tcpshow The output of tcpdump, as seen in the preceding examples and in Chapter 4, can be quite terse and require some experience to tease out the information. The tcpshow program is designed to provide a more human-readable format for the packets. 1063: . 2850371889:2850373345(1456) ack 2835338 win 18928 (DF) Now, consider the following result from tcpshow: 32 1. 136 TCP Header Source Port: 80 (www) Destination Port: 1063 «unknown» Sequence Number: 2850371889 Acknowledgement Number: 0002835338 Header Length: 20 bytes (data=1456) Flags: URG=off, ACK=on, PSH=off RST=off, SYN=off, FIN=off Window Advertisement: 18928 bytes Checksum: Ox4E68 Urgent Pointer: 0 TCP Data <*** Rest of data missing from packet dump ***> The information is in a much more human-readable format.

There are a number of implementations of the ping utility, but I will discuss the most common (ICMP) implementation. The standard usage is ping host Several "echo request" ICMP packets are sent to the host. The host replies with "echo reply" (unless a firewall or other security measure denies this or the machine is not responding or nonexistent), and the time between packets is computed. This gives an estimate for the time it takes for packets to transit between the machines. Packets will be sent until the user kills the program (one can specify the number of 28 1.

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Computer Intrusion Detection and Network Monitoring: A Statistical Viewpoint by David J. Marchette

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