Search Algorithms on the web

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HEINZ NIXDORF INSTITUT

University of Paderborn

Algorithms und Complexity

Seminar

Algorithms of the Internet

Christian

Schindelhauer2004-04-19

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HEINZ NIXDORF INSTITUTE



Christian Schindelhauer

Seminar Algorithms of the Internet

Motivation

The Internet

is the public global wide-area interconnection network for computers grows exponentially

evolves

The evolution of the Internet

Crises and catastrophes Computer hackers since the 70s

The traffic breakdown in the 80s

Denial of service attacks in the 90s

SPAM forever

Clever algorithmic solutions

Secure protocols

TCP bandwidth control

DoS-detection

SPAM-filters


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Goals of the Seminar

Algorithms of the Internet

Literature recherche in a hot topic Write an survey on the state of the art

Give a presentation on this field

Interact with others on scientific research

Provide material for

the community future lectures and seminars

a book


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Organization

See the Web-page

http://wwwcs.upb.de/cs/ag-madh/WWW/Teaching/2004SS/AlgInternet/

Today: Registration

Assignment of topics

Next two meetings: Kickoff and feedback

May 10th/17th: 2pm-6pm

1st presentation

From May to July weekly (voluntary) meetings for consultation

July 19th/26th: 1pm-7pm

2nd presentation August 1st (11:59 pm): Deadline for written assignment

August 30th (2pm): Evaluation, grades and comments

(voluntary participation)


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The Deliverables

1st presentation

Duration 15 min.

Presents

main issue

strategy to get the work done

2nd presentation Duration 45 min.

Survey of the research area

Written assignment

5-10 pages (pure text without title, references, and figures) Survey of the most relevant and interesting work in the assigned

area


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How it Counts for the Grade

1st presentation

0%

2nd presentation

25 %

Written assignment

75 %


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Contents of Written Assignment

Scientific survey on the assigned topic

For broad audience interested in algorithms and Internet

Table of contents for Tachyonic Networking

1. What is Tachyonic Network Transmissions (TNT)

2. Applications of TNT3. How TNT began

4. The main streams of TNT

5. Recent developments in Tachyonic Networking and Computing

6. Focus: The TachyNet - A clever solution of TNT

7. Open problems and upcoming developments

References


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Format and Layout of WrittenAssignment

American English

Neutral style

5-10 pages (pure text without title, references, and figures)

Accurate and correct citations and references

LATeX, BibTeX

Deliverables

LATeX source file

BibTeX file

Compiled PDF-output

As many referred text documents as possible

Electronically if possible On paper if necessary


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1. The Mobile Internet

IP Tunneling

Mobile Ad-hoc Networks

Handhelds, PDA

UMTS, WAP


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2. P2P-Networks

1st generation

Napster, Kazaa, Gnutella

Modern P2P-Networks

CAN, CHORD, Tapestry,

Visit the lecture Algorithmen fr Peer-to-Peer-Netzwerke

But do not copy (all)


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3. Web Caching

Relieving hot spots in the Internet

Akamai

Distributed Hash Tables

Take a look into the script Algorithmische Grundlagen des Internets,

Summer 2003


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5. The Structure of the Web

The WWW is made by individuals

Yet the structure can be described by Pareto-distribution

number of links, size of connected components

The graph structure of the WWW


Summer 2002 Link to Web search machines


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6. Security mechanisms of the Internet

Are there any?

Is it all trust-based?

Start your investigations for the search of the missing crypto-layer of

TCP/IP at the secure shell protocol


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7. Denial of Service Attacks

A new problem from the 90s

Solutions

Ingress filtering

Link testing

Logging

ICMP Trace back Marking (!!!)


Summer 2003


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8. Worms, Viruses, and SPAM

Definition

How they spread

How they work

The perfect Antivirus-Software

An Immune-System for Computers


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9. Epidemic Algorithms

Demers et al.

Epidemic algorithms for mirroring data bases

Idea: Spread information like a virus

Some analyses and new ideas by

Karp et al. 2001, Randomized Rumor Spreading

Take a look into the script Algorithmische Grundlagen des Internets,Summer 2002


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10. The Domain Name System

What is it?

How does it work?

Why is it so stable?

Alternatives?


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11. Bandwidth Allocation of TCP

Very classical problem of TCP/IP

Strangely enough network congestion in the Internet is healed in the

transport layer and not in the network layer

Start with the scripts

Algorithmische Grundlagen des Internets, Summer 2002 and 2003

Random early deletion (RED) New TCP-allocation for Tera-Baud-connections


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12. Routing Algorithms of IP

Start with the standard algorithms

There are lots of theoretical work of routing algorithms

Concentrate on such algorithms related to IP


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14. The self-organization of the Internet

Official organizations of the Internet (IETF, )

The Internet and its self-regulation

socially and technology based


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15. Wild Card

Did we miss something?

Take a hot topic of your choice within this area.

If everything fails, Ill help.


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HEINZ NIXDORF INSTITUT



Thanks and lets go!


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Search Algorithms on the web