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© Copyright 1997, The University of New Mexico M-1 Internet and WWW Services Security Types of Services Vended versus Internally Provided Costs and Benefits.

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Presentation on theme: "© Copyright 1997, The University of New Mexico M-1 Internet and WWW Services Security Types of Services Vended versus Internally Provided Costs and Benefits."— Presentation transcript:

1 © Copyright 1997, The University of New Mexico M-1 Internet and WWW Services Security Types of Services Vended versus Internally Provided Costs and Benefits Servers and Clients Potential Problems Stats

2 © Copyright 1997, The University of New Mexico M-2 General Network Security Isolated Servers Restricted Subnets Firewalls Proxy Servers

3 © Copyright 1997, The University of New Mexico M-3 WWW Application Security OS Level Server Level Program Level

4 © Copyright 1997, The University of New Mexico M-4 Types of WWW Services Static Data Server Search Engines Dynamic Data Server Applications Java Enabled

5 © Copyright 1997, The University of New Mexico M-5 Vended Which Vendor How Much Do They Do –HTML –Graphics –Design & Layout –Programming Bandwidth –Total –Dedicated

6 © Copyright 1997, The University of New Mexico M-6 Internally Provided WWW Server For who? How many services, how much traffic? For what use (scope the server) ?

7 © Copyright 1997, The University of New Mexico M-7 Cost of a WWW Service Server Usage Disk Space Network Bandwidth Router or LAN Load Application Development with Limited Capabilities Application Development with Limited Standardization

8 © Copyright 1997, The University of New Mexico M-8 Benefits High-touch, High Impact Narrow-casting Kiosks Fast, Simple Apps From Central Server Built-in Protocols Potentially Large Installed Client Base

9 © Copyright 1997, The University of New Mexico M-9 Shopping List Server Machine and O/S Network Access WWW Server WWW Client Server Programming Tools Data and/or Databases

10 © Copyright 1997, The University of New Mexico M-10 Which Server Platform? Unix NT

11 © Copyright 1997, The University of New Mexico M-11 Which Server? CREN Microsoft Netscape - Communication or Commerce O’Reilly WebForce Oracle WebServer

12 © Copyright 1997, The University of New Mexico M-12 Client Compliance Level HTML 2.0 HTML 3.0 Netscape Enhancements Java Lynx (Text Browser)

13 © Copyright 1997, The University of New Mexico M-13 CGI-BIN Risks Dangerous Programs or Scripts User-supplied Programs or Scripts

14 © Copyright 1997, The University of New Mexico M-14 Robots and Other Network Creatures Problems with “Automated Agents” Deterring Robots Reacting to Robots

15 © Copyright 1997, The University of New Mexico M-15 WWW Server Stats

16 © Copyright 1997, The University of New Mexico M-16 WWW Server Stats

17 © Copyright 1997, The University of New Mexico M-17 Web Mining Web based information extraction

18 © Copyright 1997, The University of New Mexico M-18 Why the Web (web = web browser) Ubiquitous: –Web browsers are on every desktop, every PC, Mac, workstation, and terminal. Platform independence –Use of Java and server side programs means clicking on a button does the same thing everywhere.

19 © Copyright 1997, The University of New Mexico M-19 Natural Language News Services Multidimensional vectors Markov objects ID3 Word frequency Data warehouse Data Cleansing Data Compression Text Mining Factorial Analysis Keyword Search Decision Trees Tri-Grams Tri-Letter Sets Hidden Information Hypothesis Verification

20 © Copyright 1997, The University of New Mexico M-20 DATA Cleansed Data Extracted Data N Display Results

21 © Copyright 1997, The University of New Mexico M-21 What Kind of Data? Usenet News –Most places have Multi gigs of news System accounting files –Can tell who is doing what, when Misc. Web pages –A variety of interesting information Listserver or public system –We keep concerning system problems

22 © Copyright 1997, The University of New Mexico M-22 Cleansing Data News article –NNTP fields –signatures Web Page –HTML codes –descriptions of links to other sites –pattern fields (headers and trailers that appear on every page at the site)

23 © Copyright 1997, The University of New Mexico M-23 Mining for data Test hypothesis Look for hidden information Find other similar information

24 © Copyright 1997, The University of New Mexico M-24 Display of Information Graphical Text Listing –Directories: human maintained categories e.g.: recreation, computers, finances, arts –Computer generated list Customized –User defined defaults –Cookie defined defaults

25 © Copyright 1997, The University of New Mexico M-25 Data and Services N Display Results Learning to use services Learning to extract data from the answer Compile and clean data

26 © Copyright 1997, The University of New Mexico M-26 What Services? Search Engines Internet White Pages –(information on individuals) Internet Yellow Pages –(information on corporations) Usenet News repositories Online libraries Online periodicals

27 © Copyright 1997, The University of New Mexico M-27 Learning to use Services Sample sets of data –can derive a format if taught to. Machine learning (same as in Data Mining) –look at every interpretation, find the one that conveys the most information.

28 © Copyright 1997, The University of New Mexico M-28 Learning to interpret answers What format is information given in? What do the fields mean? –Can identify unknown fields by matching the data with a known information.

29 © Copyright 1997, The University of New Mexico M-29 Compile and Clean Data Redundancies Duplicates Redundancies Newer information has precedence

30 © Copyright 1997, The University of New Mexico M-30 Security Server environment –Use trusted CGI scripts and server side includes Client environment –Restrict access by IP number or domain –Restrict access by password Internet –encrypt data (PGP) –Certification authority

31 © Copyright 1997, The University of New Mexico M-31 Data is in database? Checking for hidden information Machine Learning N Y

32 © Copyright 1997, The University of New Mexico M-32 Article: of comp.lang.perl.misc Path: lynx.unm.edu!pr1.plk.af.mil!tesuque.cs.sandia.gov!sloth.swcp.com!news.ironhorse.com!op.net!news.mathworks.com!enews.sgi.com!news. sgi.com!mr.net!news.mid.net!sbctri.tri.sbc.com!newspump.wustl.edu!newsfeed.rice.edu!rice!add From: (Arthur Darren Dunham) Newsgroups: comp.lang.perl.misc,comp.infosystems.www.authoring.html Subject: Re: WWW: web site "pre-processor" in perl ? Date: 31 Oct :20:06 GMT Organization: Rice University Lines: 23 Message-ID: References: NNTP-Posting-Host: pecos.is.rice.edu Xref: lynx.unm.edu comp.lang.perl.misc:52151 comp.infosystems.www.authoring.html: In article, Clay Shirky wrote: > >Au contraire. HTML _is_ broken, relative to, say, SGML, but if you are >careful with your tags and comment carefully, your data can be derived >from your HTML files, not v-v. > >find. -name '*html' -exec perl -p -i.bak -e > 's#( ]*bgcolor="?)oatmeal("?[^>]*>)#$1skyblue$2#i;' {} \; or if you wanted perl to do all the work, rather than have find(1) launch N perl executables for each.html files, you could do this.... find. -type f -name '*html' -print | xargs perl -p -i.bak -e 's#( ]*bgcolor="?)oatmeal("?[^>]*>)#$1skyblue$2#i;' That way, perl happily iterates through all the lines in all the files since we don't care which file we're in when we do the substitution. -- Darren Dunham UNIX Sysadmin Rice University (This line currently in revision) Houston, TX Any resemblance between real opinions and my post is coincidental

33 © Copyright 1997, The University of New Mexico M-33 Information gathering Information Gathering Just some sample text which might or might not be worthless. You'd want to sort out which of this was just HTML tags and other worthless junk and which was meaningful. Links to A link to something on this site A link to something on this another site

34 © Copyright 1997, The University of New Mexico M-34 Re: Scots and English Gregory J Dalley, 30 May 1995, Lines: 18. Re: Dutch and English accents Phil Rose, 15 Jun 1995, Lines: 28. Re: ANY SIL'rs out there? A.K.A. Summer Institute of Linguistics. yomomma, 16 Jun 1995, Lines: 6. Conferences, Seminars-info wanted chris bowen, Mon, 03 Jul 1995, Lines: 7. AIGH? Coby (Jacob) Lubliner, 8 Jul 1995, Lines: 8. "Shall" and "Will" in Welsh English Wed, 19 Jul 95, Lines: 14. careers in linguistics scharle, 10 Sep 1995, Lines: 8. job opportunities in computational linguistics? Sonny Xuan Vu, 30 Sep 1995, Lines: 14. Re: job opportunities in computational linguistics? Miss Sarah Tiller, Wed, 4 Oct 1995, Lines: 27. Re: What Is Singapore English? Zhong Qiyao, 11 Dec 1995, Lines: 28. Re: What Is Singapore English? Chew Kim Swee Andrew, 14 Dec 1995, Lines: 41. Re: What Is Singapore English? Pota alok Ashwin, 16 Dec 1995, Lines: 45. Re: How to write in English... Ann Weiner, Tue, 2 Jan 1996, Lines: 13. Re: What Is Singapore English? Wing Luk, 7 Jan 1996, Lines: 27. Linguistics Careers lebitz,stacey b, 23 Jan 1996, Lines: 14. English Teaching Offering in China - offer2.doc [1/1] XIAOJUN ZHANG, 24 Jan 1996, Lines: 240. TRYING TO PROTECT YOUR WORK? prepaid, Sun, 04 Feb 1996, Lines: 1. Give me, please, one program for learn to speak english!! Please!! "Eugen I. Ivanov", 20 Feb 1996, Lines: 1. Re: The English "R" for Germans Joerg Settemeyer, 8 Mar 1996, Lines: 5. English Tutor Needed. Mua Tran, 23 Mar 1996, Lines: 20. Re: old form of shorthand Fido, 1 Apr 1996, Lines: 9. Re: Math as pornography Gordon Fitch, 17 May 1996, Lines: 7. Re: Chain Shift Charles Lieberman, 26 Jul 1996, Lines: 10. Re: Tendency of Inflections to Disappear - Why? Terrence Griffin, 28 Jul 96, Lines: 1. Re: Concerning the number of esperantists Marc Bonnaud, Fri, 09 Aug 1996, Lines: 14. Re: Concerning the number of esperantists Cheradenine Zakalwe, Fri, 9 Aug 1996, Lines: 16. Re: Concerning the number of esperantists Alan Gould, Sat, 10 Aug 1996, Lines: 22. Re: Concerning the number of esperantists Don HARLOW, Sun, 11 Aug 1996, Lines: 21. Re: Kiom da E-istoj *ne* regas la anglan? Andrew McConnell, Fri, 30 Aug 1996, Lines: 19. cohesion in CMC Per-Mikael Jansson ENGE, 22 Oct 1996, Lines: 10. Articles from sci.lang selected through webSOM

35 © Copyright 1997, The University of New Mexico M-35 Limitations of the Web Some functionality/specialization was given up for ubiquity Transfer time –Mass data transfer prohibitive External to machine –Reliance on network Not inherently as secure as staying home

36 © Copyright 1997, The University of New Mexico M-36 Why Data Mining There is a lot of data of unknown worth and purity Data mining uses the same underlying procedures as other knowledge discovery/ data extraction systems

37 © Copyright 1997, The University of New Mexico M-37 Automatic Customization to user preferences Web pages –Hotwired autoconfigs based on what you surf to News services –usenet service custom.roy-corey.1 Information display paradigm –industry report style –collegiate style –Microsoft style

38 © Copyright 1997, The University of New Mexico M-38 Methods for gathering data Extraction from documents –data mining –keyword searches –similarity searches Extraction from services –ILA: internet learning agents –Softbots –Metacrawler

39 © Copyright 1997, The University of New Mexico M-39 Data mining on the web? Transfer rate too slow to transfer most databases whenever you want Computation too intensive to let others mine your database whenever they want So: Use pre-collected data or pre-indexed database

40 © Copyright 1997, The University of New Mexico M-40 Java -- What is it? Programming Language Java Compiler Java Interpreter (Java Virtual Machine) For creating applets which run inside a browser For creating applications (stand alone programs)

41 © Copyright 1997, The University of New Mexico M-41 Java Application Source Code // // Sample HelloWorld application // class HelloWorldApp { public static void main(String args[]) { System.out.println("Hello World!"); }

42 © Copyright 1997, The University of New Mexico M-42 Java Applet Source Code // // Sample HelloWorld applet // import java.awt.Graphics; import java.applet.Applet; public class HelloWorld extends Applet { public void paint (Graphics g){ g.drawString("Hello world!", 25, 25); }

43 © Copyright 1997, The University of New Mexico M-43 How could you use it? Client applets or applications Server code Portable code Create via Developer Tools

44 © Copyright 1997, The University of New Mexico M-44 Developer Tools Visual C++ (Visual Java?) Symantec Sun SGI - Cosmo Code

45 © Copyright 1997, The University of New Mexico M-45 Developer Tools SourceCraft Powersoft - Fusion Quintessential Objects - Diva for Java (Javaside) Roguewave - JFactory

46 © Copyright 1997, The University of New Mexico M-46 Advantages Object Oriented and event-driven Portable* bytecode Multi-threaded Integrated Network Abilities Built-in Multimedia Capabilities “Robust and Secure”

47 © Copyright 1997, The University of New Mexico M-47 Drawbacks Few deployed clients Very C++ -like Not yet stabilized Very few Developer Tools Not all the class libraries exist (yet)

48 © Copyright 1997, The University of New Mexico M-48 Class Structure Class java.applet.Applet java.lang.Object | +----java.awt.Component | +----java.awt.Container | +----java.awt.Panel | +----java.applet.Applet

49 © Copyright 1997, The University of New Mexico M-49 Security OS security in applications “No Pointers” and no user memory management Compile-time and Run-time checking Client Data Security –No access to disk from Netscape –Directory-based security in Hot Java

50 © Copyright 1997, The University of New Mexico M-50 Security Network Security –No Applets –No Access –Applet Host –Firewall –Any Host

51 © Copyright 1997, The University of New Mexico M-51 Security Problems CERT Firewall Security –ftp://info.cert.org/pub/cert_advisories/CA java_applet_security_mgr CERT Bytecode Verifier –ftp://info.cert.org/pub/cert_advisories/CA java_bytecode_verifier

52 © Copyright 1997, The University of New Mexico M-52 Alternative Options Visual Basic and browsers Visual Basic separate from WWW Web Server without Java

53 © Copyright 1997, The University of New Mexico M-53 Books About Java Teach Yourself Java in 21 Days Java! Hooked On Java Presenting Java O’Reilly

54 © Copyright 1997, The University of New Mexico M-54 Java WWW Sites Sun –http://java.sun.com/ The Internet Programming Page –http://www.apexsc.com/vb/internet.html Rogue Wave Home Page –http://www.roguewave.com/ Symantec Café –http://cafe.symantec.com/cafe/index.html

55 © Copyright 1997, The University of New Mexico M-55 Java WWW Sites JavaSoft –http://www.javasoft.com/ The Java Directory (Gamelan) –http://www.gamelan.com/ IBM: Centre for Java Technology –http://www.hursley.ibm.com/javainfo/ News: comp.lang.java


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