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LectureNote1-BasicSecurityConcepts

LectureNote1-BasicSecurityConcepts - CS 556 Computer...

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CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 1 / 38 CS 556 - Computer Security Dr. Indrajit Ray Email: [email protected] Department of Computer Science Colorado State University Fort Collins, CO 80523, USA
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B ASIC S ECURITY C ONCEPTS B ASIC S ECURITY C ONCEPTS CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 2 / 38
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Why Security? B ASIC S ECURITY C ONCEPTS CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 3 / 38 Not a major issue for non-networked centralized systems Single administrative control Policies can be well defined and enforced System can be physically secured Access can be easily monitored and restricted
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Network Connectivity Changes Everything B ASIC S ECURITY C ONCEPTS CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 4 / 38
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Internet Perspective B ASIC S ECURITY C ONCEPTS CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 5 / 38 Spans 176 countries Legal system varies No central administration means practically impossible to enforce any policy Users - Universities, government agencies, research organizations, corporations, etc.
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Scope of Internet Security Problems B ASIC S ECURITY C ONCEPTS CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 6 / 38 Public, private and government networks have been penetrated by unauthorized users and rogue programs Increased volume of security breaches being reported regularly Many go unreported for fear of loosing face
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National Cyber Incident Statistics B ASIC S ECURITY C ONCEPTS CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 7 / 38
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Internet Security Concerns B ASIC S ECURITY C ONCEPTS CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 8 / 38
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Attack Trends 2000 – 2007 B ASIC S ECURITY C ONCEPTS CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 9 / 38
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2007 Dollar Amount Losses (Total = $66,930,950) B ASIC S ECURITY C ONCEPTS CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 10 / 38
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Contributing Factors B ASIC S ECURITY C ONCEPTS CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 11 / 38 Lack of awareness of Internet threats and risks Security measures are often not considered until an enterprise has been attacked Wide open network policies Many sites allow very liberal and open access Vast majority of Internet traffic is unencrypted and can be captured and/or monitored
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Contributing Factors (cont’d) B ASIC S ECURITY C ONCEPTS CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 12 / 38 Lack of security in the TCP/IP protocol suite Complexity of security management and administration Gloated and buggy software Improved hacking / cracking skills
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Security Objectives B ASIC S ECURITY C ONCEPTS CS 556 - Computer Security - c circlecopyrt 2009 Colorado State University – 13 / 38 Availability Integrity Confidentiality
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