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THE NEED FOR NETWORK SECURITY Thanos Hatziapostolou.

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Presentation on theme: "THE NEED FOR NETWORK SECURITY Thanos Hatziapostolou."— Presentation transcript:

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2 THE NEED FOR NETWORK SECURITY Thanos Hatziapostolou

3 The Need for Web Security2 PRESENTATION OBJECTIVES  Understand information security services  Be aware of vulnerabilities and threats  Realize why network security is necessary  What are the elements of a comprehensive security program

4 The Need for Web Security3 TRENDS FOR INFORMATION  More information is being created, stored, processed and communicated using computers and networks  Computers are increasingly interconnected, creating new pathways to information assets  The threats to information are becoming more widespread and more sophisticated  Productivity, competitiveness, are tied to the first two trends  Third trend makes it inevitable that we are increasingly vulnerable to the corruption or exploitation of information INFORMATION IS THE MOST VALUABLE ASSET

5 The Need for Web Security4 Information Security Services  Confidentiality  Integrity  Authentication  Nonrepudiation  Access Control  Availability

6 The Need for Web Security5 Information Security Services  Confidentiality  Maintaining the privacy of data  Integrity  Detecting that the data is not tampered with  Authentication  Establishing proof of identity  Nonrepudiation  Ability to prove that the sender actually sent the data  Access Control  Access to information resources are regulated  Availability  Computer assets are available to authorized parties when needed SERVICES

7 The Need for Web Security6  Collection of networks that communicate  with a common set of protocols (TCP/IP)  Collection of networks with  no central control  no central authority  no common legal oversight or regulations  no standard acceptable use policy  “wild west” atmosphere What Is The Internet?

8 The Need for Web Security7 Why Is Internet Security a Problem?  Security not a design consideration  Implementing change is difficult  Openness makes machines easy targets  Increasing complexity

9 The Need for Web Security8 Common Network Security Problems  Network eavesdropping  Malicious Data Modification  Address spoofing (impersonation)  ‘Man in the Middle’ (interception)  Denial of Service attacks  Application layer attacks

10 The Need for Web Security9 Security Incidents are Increasing Sophistication of Hacker Tools Technical Knowledge Required High Low from Cisco Systems

11 The Need for Web Security10 HACKED WWW HOMEPAGES 11/29/96 CIA HOMEPAGE DOJ HOMEPAGE USAF HOMEPAGE

12 The Need for Web Security11 Problem is Worsening Internet Security Violations Jerusalem Tequila Michelangelo Good Times Melissa & ILOVEYOU Anna Kournikova Code Red Nimba Badtrans Source: CERT® Coordination Center Carnegie Mellon

13 The Need for Web Security12 VIRUSES VIRUSES Risk ThreatDiscoveredProtection TROJ_SIRCAM.ANew !!Latest DAT W32.Navidad11/03/200011/06/2000 W95.MTX8/17/20008/28/2000 W32.HLLW.QAZ.A7/16/20007/18/2000 VBS.Stages.A6/16/20006/16/2000 VBS.LoveLetter5/04/20005/05/2000 VBS.Network2/18/20002/18/2000 Wscript.KakWorm12/27/199912/27/1999 W32.Funlove /08/199911/11/1999 PrettyPark.Worm6/04/19996/04/1999 Happy99.Worm1/28/19991/28/1999

14 The Need for Web Security13 Consider that…  90% of companies detected computer security breaches in the last 12 months  59% cited the Internet as the most frequent origin of attack  74% acknowledged financial losses due to computer breaches  85% detected computer viruses Source: Computer Security Institute

15 The Need for Web Security14 WHO ARE THE OPPONENTS?  49% are inside employees on the internal network  17% come from dial-up (still inside people)  34% are from Internet or an external connection to another company of some sort HACKERS

16 The Need for Web Security15 HACKER MOTIVATIONS  Money, profit  Access to additional resources  Experimentation and desire to learn  “Gang” mentality  Psychological needs  Self-gratification  Personal vengeance  Emotional issues  Desire to embarrass the target

17 The Need for Web Security16 Internet Security? Malicious Code Viruses Worms Buffer Overflows Session Hijacking Port Scanning Trojans Denial of Service Spoofing Replay Attack Man-in-the-middle

18 The Need for Web Security17 What Do People Do When They Hear All These?  Take the risks!  But there are solutions  Ignoring the situation is not one of them

19 The Need for Web Security18 THE MOST COMMON EXCUSES  So many people are on the Internet, I'm just a face in the crowd. No one would pick me out.  I'm busy. I can't become a security expert--I don't have time, and it's not important enough  No one could possibly be interested in my information  Anti-virus software slows down my processor speed too much.  I don't use anti-virus software because I never open viruses or attachments from people I don't know.

20 The Need for Web Security19 SANS Five Worst Security Mistakes End Users Make 1.Opening unsolicited attachments without verifying their source and checking their content first. 2.Failing to install security patches-especially for Microsoft Office, Microsoft Internet Explorer, and Netscape. 3.Installing screen savers or games from unknown sources. 4.Not making and testing backups. 5.Using a modem while connected through a local area network.

21 The Need for Web Security20 SECURITY COUNTERMEASURES THREE PHASE APPROACH PROTECTION DETECTION RESPONSE

22 The Need for Web Security21 ELEMENTS OF A COMPREHENSIVE SECURITY PROGRAM Have Good Passwords Use Good Antiviral Products Use Good Cryptography Have Good Firewalls Have a Backup System Audit and Monitor Systems and Networks Have Training and Awareness Programs Test Your Security Frequently Principles

23 The Need for Web Security22 CRYPTOGRAPHY Necessity is the mother of invention, and computer networks are the mother of modern cryptography. Ronald L. Rivest  Symmetric Key Cryptography  Public Key Cryptography  Digital Signatures

24 The Need for Web Security23 Firewall Visible IP Address Internal Network PC Servers Host A system or group of systems that enforces an access control policy between two networks.

25 The Need for Web Security24

26 The Need for Web Security25 THANK YOU I have questions…


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