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Design and Analyze
Secure Networked Systems
2
Prof. Edward Chow @ Colorado Univ.
Note by waegaein@github.com
Glossary
• Risk
• The sum of all impacts of security events and their probability of
occurrence.
• Impact
• A harm caused by these security event. It can be measured as a cost
of loss or degrade of services related to the event.
• Risk Assessment
• Performed by categorizing system components, assessing related
security events, evaluating the significance of their impact.
Methods of Defense
• Prevent the intrusion from arriving or happening.
• Deter attacks by increasing the penalty of being caught,
making it difficult and costly to close the hurdle.
• Deflect attackers attention.
• Detect to provide early detection of intrusion.
• Recover the system or mitigate the damage by deploying the
layer of defenses.
Security Principles
• A collection of desirable system property behaviors, designs
and implementation practice that can reduce the risk.
• Reduce either the likelihood of the harm occurrence or their
impact.
• We can be aware of the threat to our system and ultimately
derive a set of protection requirements.
1 Defense in Depth
• Layers of security mechanisms increase the security of the system
as a whole. If an attack causes one security mechanism to fail,
other mechanisms may still provide the necessary security to
protect the system.
• For network and infrastructure attacks
• Protect the local area network
• Protect the wide area network
• Deploy firewall
• Deploy intrusion detection system
• For insider attacks
• Deploy physical and personal security
• Deploy authenticated access control and auditing procedure
2 Defense with Diversity
• Mono instruction architecture such as Intel 386 or 64 architecture
used by current computer systems make it easier for attackers to
develop just one malicious software and then attack vulnerabilities
existing in all the system using the same ISA architectures.
• We should encourage the development of diversity in
• System architectures
• Operating systems
• Library / Packages
• Programming languages / Frameworks
• We should produce framework that allow real-time seamless
service/application migration from one system which fails (or
about to fail) to the others.
3 Cyber Resilience
• The ability of an architecture to support the function
necessary for mission success in spite of those hostile action
and adverse condition.
• An architecture is more resilient if it can provide these
functions with
• Higher probability
• Shorter periods of reduced capability
• Across a wider range of scenario/condition/threat.

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Design and Analyze Secure Networked Systems - 2

  • 1. Design and Analyze Secure Networked Systems 2 Prof. Edward Chow @ Colorado Univ. Note by waegaein@github.com
  • 2. Glossary • Risk • The sum of all impacts of security events and their probability of occurrence. • Impact • A harm caused by these security event. It can be measured as a cost of loss or degrade of services related to the event. • Risk Assessment • Performed by categorizing system components, assessing related security events, evaluating the significance of their impact.
  • 3. Methods of Defense • Prevent the intrusion from arriving or happening. • Deter attacks by increasing the penalty of being caught, making it difficult and costly to close the hurdle. • Deflect attackers attention. • Detect to provide early detection of intrusion. • Recover the system or mitigate the damage by deploying the layer of defenses.
  • 4. Security Principles • A collection of desirable system property behaviors, designs and implementation practice that can reduce the risk. • Reduce either the likelihood of the harm occurrence or their impact. • We can be aware of the threat to our system and ultimately derive a set of protection requirements.
  • 5. 1 Defense in Depth • Layers of security mechanisms increase the security of the system as a whole. If an attack causes one security mechanism to fail, other mechanisms may still provide the necessary security to protect the system. • For network and infrastructure attacks • Protect the local area network • Protect the wide area network • Deploy firewall • Deploy intrusion detection system • For insider attacks • Deploy physical and personal security • Deploy authenticated access control and auditing procedure
  • 6. 2 Defense with Diversity • Mono instruction architecture such as Intel 386 or 64 architecture used by current computer systems make it easier for attackers to develop just one malicious software and then attack vulnerabilities existing in all the system using the same ISA architectures. • We should encourage the development of diversity in • System architectures • Operating systems • Library / Packages • Programming languages / Frameworks • We should produce framework that allow real-time seamless service/application migration from one system which fails (or about to fail) to the others.
  • 7. 3 Cyber Resilience • The ability of an architecture to support the function necessary for mission success in spite of those hostile action and adverse condition. • An architecture is more resilient if it can provide these functions with • Higher probability • Shorter periods of reduced capability • Across a wider range of scenario/condition/threat.