Add draft CISA Secure by Design Cheat Sheet (expanded version)

Author: Prasad-JB

cheatsheets/CISA_Secure_By_Design_Cheat_Sheet.md

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+# CISA Secure by Design Cheat Sheet
+
+## Introduction
+CISA’s *Secure by Design* initiative defines seven principles that guide organizations toward building software with security as a core business requirement.  
+This cheat sheet provides developers, architects, and security teams with practical, actionable steps to align with these principles.
+
+---
+
+## 1. Take Ownership of Customer Security Outcomes
+- Ship products with **secure defaults** (e.g., MFA, encryption at rest & in transit).  
+- Provide clear documentation of security features and configurations.  
+- Deliver timely patches and updates, not leaving customers to defend themselves.  
+
+---
+
+## 2. Embrace Radical Transparency and Accountability
+- Publish **vulnerability advisories** openly with remediation timelines.  
+- Share **SBOMs (Software Bill of Materials)** with customers.  
+- Document secure configuration baselines.  
+
+---
+
+## 3. Lead with Security as a Business Priority
+- Make **security a core KPI**, not just a compliance checkbox.  
+- Integrate **threat modeling and security reviews** early in the design process.  
+- Ensure executive buy-in and accountability for security outcomes.  
+
+---
+
+## 4. Understand and Address Harm Across the Product Lifecycle
+- Identify and mitigate **misuse/abuse cases** during design.  
+- Provide secure **end-of-life and deprecation policies**.  
+- Consider the **human and societal impacts** of insecure defaults.  
+
+---
+
+## 5. Ensure Default Secure Configurations
+- Disable insecure or legacy options by default.  
+- Enforce **least privilege** and **role-based access control**.  
+- Ship products with **logging and monitoring enabled** out of the box.  
+
+---
+
+## 6. Implement Security Controls at Scale
+- Automate patching, vulnerability scanning, and CI/CD security checks.  
+- Use vetted, secure coding frameworks and libraries.  
+- Standardize secure configurations across environments.  
+
+---
+
+## 7. Prioritize Security Investments for Maximum Impact
+- Focus first on **exploitable, high-risk vulnerabilities**.  
+- Invest in developer education and secure coding training.  
+- Track and measure the ROI of security improvements.  
+
+---
+
+## References
+- [CISA Secure by Design Alert](https://www.cisa.gov/news-events/alerts/2023/04/13/shifting-balance-cybersecurity-risk-principles-secure-design)  
+- [CISA Secure by Design PDF](https://www.cisa.gov/sites/default/files/2023-04/principles_secure_by_design_secure_by_default_508c.pdf)  
+- [OWASP Secure Product Design Cheat Sheet](Secure_Product_Design_Cheat_Sheet.md)  
+
+---