Podcast
Questions and Answers
What is one of the main goals of security engineering in software development?
What is one of the main goals of security engineering in software development?
- To prioritize features over security.
- To integrate security-minded thinking into the process. (correct)
- To increase software complexity.
- To eliminate the need for testing.
Which security design principle advocates for maintaining a straightforward approach?
Which security design principle advocates for maintaining a straightforward approach?
- Trust with Confidence
- Favor Complexity
- Favor Simplicity (correct)
- Defensive Programming
What does the acronym STRIDE represent in threat modeling?
What does the acronym STRIDE represent in threat modeling?
- Simplicity, Transparency, Reliability, Integrity, Data Protection
- Software, Threats, Resilience, Implementation, Defense
- Security, Trust, Risk, Integrity, Development
- Spoofing, Tampering, Repudiation, Information Disclosure, Denial of Service, Elevation of Privilege (correct)
What is the primary difference between a software flaw and a software bug?
What is the primary difference between a software flaw and a software bug?
What is a consequence of not considering security throughout the entire software development process?
What is a consequence of not considering security throughout the entire software development process?
Which approach is suggested to avoid design flaws in secure software?
Which approach is suggested to avoid design flaws in secure software?
What is one of the key tenets in the article "Simplicity Is the Ultimate Sophistication"?
What is one of the key tenets in the article "Simplicity Is the Ultimate Sophistication"?
Trust with reluctance is primarily about:
Trust with reluctance is primarily about:
Elevation of privilege in threat modeling refers to:
Elevation of privilege in threat modeling refers to:
What is the relationship between secure software design and user feedback?
What is the relationship between secure software design and user feedback?
What does the principle of 'Trust with Reluctance' emphasize?
What does the principle of 'Trust with Reluctance' emphasize?
Defense in depth mainly seeks to address what kind of security challenge?
Defense in depth mainly seeks to address what kind of security challenge?
What is meant by 'attack surface' in the context of software design?
What is meant by 'attack surface' in the context of software design?
Which of the following best describes the principle of 'least privilege'?
Which of the following best describes the principle of 'least privilege'?
What does the secure design principle of 'modularity' refer to?
What does the secure design principle of 'modularity' refer to?
What is the focus of the principle of 'fail secure'?
What is the focus of the principle of 'fail secure'?
Which principle emphasizes the importance of complete mediation?
Which principle emphasizes the importance of complete mediation?
What does 'separation of domains' imply in secure design?
What does 'separation of domains' imply in secure design?
Which principle aims to minimize trust surface interactions?
Which principle aims to minimize trust surface interactions?
What is the primary objective of encapsulation in software security?
What is the primary objective of encapsulation in software security?
Flashcards
Security Engineering
Security Engineering
Applying security considerations throughout the software development process.
Threat Modeling
Threat Modeling
Identifying potential attacks on a system.
Software Security Requirements
Software Security Requirements
Defining security needs and goals for software.
Software Design Flaws
Software Design Flaws
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Favor Simplicity
Favor Simplicity
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Trust with Reluctance
Trust with Reluctance
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Defense in Depth
Defense in Depth
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Top Design Flaws
Top Design Flaws
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Software Vulnerability
Software Vulnerability
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Spoofing
Spoofing
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Attack Surface
Attack Surface
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Minimize Attack Surface
Minimize Attack Surface
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Modularity
Modularity
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Separation of Domains
Separation of Domains
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Least Privilege
Least Privilege
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Complete Mediation
Complete Mediation
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Fail-Safe Defaults/Fail Secure
Fail-Safe Defaults/Fail Secure
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Study Notes
Course Information
- Course code: CSC 1029
- Course title: Designing Secure Software
Week 06 Agenda
- Designing & Building Secure Software
- Threat Modeling
- Software Security Requirements
- Avoiding Software Design Flaws
- Favor Simplicity
- Trust with Reluctance
- Defense in Depth
- Top Design Flaws
- Case Study
- Interview on Building Secure Software
- Interactive Lesson
- TODO & Resources for Help
Design and Building Secure Software
- Protection of Information in Computer Systems (Saltzer and Schroeder, 1975) is a highly relevant classic paper.
Threat Modeling
- There are five major threat modeling steps:
- Defining security requirements
- Creating an application diagram
- Identifying threats
- Mitigating threats
- Validating that threats have been mitigated
- Threat modeling should be incorporated in the development lifecycle to reduce risk.
- Common threat categories (STRIDE):
- Spoofing (S)
- Tampering (T)
- Repudiation (R)
- Information disclosure (I)
- Denial of service (D)
- Elevation of privilege (E)
Software Security Requirements
Avoiding Software Design Flaws
- Security flaws are weaknesses in software code that attackers can exploit.
- Software vulnerabilities are implementation-level bugs
- Design flaws are security problems in the software system.
- Security needs to be considered throughout development.
Secure Design Principle: Favor Simplicity
- Articles like "Simplicity is the Ultimate Sophistication" and Bruce Schneier's plea for simplicity in computer systems emphasize simpler designs for secure software.
Secure Design Principle: Trust with Reluctance
- Trust with reluctance, a security principle, emphasizes limiting trust levels ("need-to-know").
Secure Design Principle: Defense in Depth
- Most applications are vulnerable when a single defense layer is breached.
- Defense in depth entails multiple layers of defense, each offering protection, and working to add resilience and help limit impact to a system if a breach occurs at a point in any of the defended layers within the system.
Secure Design Principle: Software Design Flaws
- Attack surface is any accessible component part within a system that can be targeted or a point on a system's defensive layers that an attacker can leverage to expose weaknesses in those defenses.
- The principle of minimizing the attack surface aims to reduce points of access that malicious users can exploit.
Case Study
- Case study of a very secure FTP.
Interview
- Interview with Gary McGraw on building secure software.
Cybersecurity Principles Interactive Lesson
- Cybersecurity principles such as:
- Modularity
- Simple designs
- Layering/Defense in depth
- Separation of Domains
- Complete Mediation
- Least privilege
- Fail-safe Defaults/Fail Secure
- Isolation
- Encapsulation
- Usability
- Open Design
- Least Astonishment
- Trust Relationships
- Minimizing trust surface
Pre-Work and Next Week
- Guidelines for completing the pre-work for Week 6.
- Introduction of the content for week 7.
Questions, Clarifications, and Help
- Access to student office hours, email, tutoring, and online resources.
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