Secure Coding and Design Best Practices in C#

Apply secure coding to write software that resists hacking, viruses, and data leaks, protecting sensitive data by following guidelines and best practices at every development stage.

Define the course scope by focusing on code-level security within enterprises, covering data, web, API, and communication security, and distinguishing secure coding from other security layers.

Target developers with solid coding maturity who want to ship secure code and ensure production security; not for beginners, and it covers the most critical security topics.

Explore secure design principles from Saltzer and Schroeder, such as economy of mechanism, complete mediation, least privilege, and open design, emphasizing secure by design from the start.

Apply the economy of design by keeping mechanisms simple and modular, rely on trusted encryption libraries, and place security checks at the edges to reduce complexity and vulnerabilities.

Apply the failsafe defaults principle by configuring system defaults to deny access unless explicitly allowed, and undo any changes on failure to prevent unauthorized access.

Enforce complete mediation by routing every access through a trusted module or authorization matrix to validate all shared resources. Deny access by default and enforce failsafe defaults while monitoring usage.

Apply the open design principle by making security design transparent and well documented, so the community can independently evaluate vulnerabilities and strengthen the system through collaboration.

Apply the principle of least privilege by granting only the minimum access necessary for users and processes, reducing unauthorized access and data loss in secure coding.

Apply the principle of psychological acceptability in secure coding and design for C#, keeping security measures precise yet easy to use, with clear error messages and minimal, reasonable user burden.

Learn how separation of privilege reduces risk by dividing a task into multiple subtasks, requiring different permissions and at least two entities to grant access.

Minimize shared mechanisms to reduce security risks by using user-centric libraries instead of universal supervisor procedures, for example per-user encrypted files in password management and independent cryptographic implementations.

Assess the work factor by comparing an attacker's resources to the cost of bypassing a security mechanism, illustrated with brute-force on a four-letter password (26^4) possibilities.

Apply the compromise recording design principle to record evidence of any breach rather than aiming for perfect prevention, enabling owners to act promptly and mitigate damage.

Master secure coding and design in c# by exploring strong authentication, access control, encryption, secure storage, and server-side validations. Implement defenses against serialization and injection vulnerabilities, and monitor with logging.

Strengthen web app security with strong authentication to prevent unauthorized access; use multi-factor authentication, verification codes or fingerprint scans, and robust account lockout to defeat weak passwords and insecure protocols.

Refactor authentication by hashing passwords with a salt and SHA-256, then compare salted hashes to verify users, with OAuth 2.0 as a practical option for third-party logins.

Implement strong authentication by enforcing robust password policies, enabling multifactor authentication, securing https with OAuth 2.0 or OpenID Connect, and applying account lockout and rate limiting.

Learn how access control ensures authorized users access the right resources by applying authorization concepts and models like role-based, attribute-based, and relationship-based access control, and common mishandlings.

Demonstrates the secured access control by validating authorization before fetching user data, ensuring admins or the same user can view profiles while others remain unauthorized.

Learn how to securely configure a web application by avoiding default or weak settings, removing unnecessary services, tightening file permissions, and enforcing https to reduce attack surfaces.

Apply configuration level security to protect sensitive files by enforcing read permissions through a permission check and owner verification, demonstrating secure file access in a C# demo.

Explore sensitive data protection in secure coding with C# by implementing encryption, secure password storage, data masking, and TLS to safeguard personal details, financial data, and user credentials.

Protect sensitive data by securing authentication with strong hashing and salt, using secure strings to prevent memory scraping, and configuring file permissions to protect encrypted information.

Explore how serialization and deserialization can create security risks when handling untrusted data, including remote code execution, injection attacks, and data exposure.

Demonstrates secure serialization and deserialization with the Newtonsoft.Json library by using explicit types, safe type name handling, and validations to prevent harmful object creation from untrusted Json data.

Learn to mitigate security risks by carefully evaluating third-party components in web apps, avoid untrusted sources, and address outdated or vulnerable dependencies, insecure defaults, and dependency chain risks.

This lecture demonstrates why relying on trusted components requires avoiding deprecated binary formatter serialization, as untrusted input can lead to remote code execution, and highlights updating libraries to secure deserialization.

Master precise logging and real time monitoring to improve incident response and threat detection, avoid incomplete or excessive logs, and maintain a clear audit trail.

Improve precise logging and monitoring of fund transfers by recording action, sender, amount, and recipient, enabling better analysis and incident response while protecting sensitive data.

Explore server side request validations to safeguard user inputs, sanitization, and file uploads, preventing SQL injection and XSS. Learn to design comprehensive validation rules to protect data integrity.

Build secure coding practices for C# by validating and sanitizing user input to prevent SQL injection, command injection, remote code execution, and unsafe file inclusion.

Demonstrates how concatenating user input into a SQL query risks injection and table drop, then shows refactoring to parameterized queries to safely fetch a user by email.

Implement secure session management, protect configuration files, store keys securely using secret managers, apply security patches promptly, and validate or sanitize text-to-code inputs in C# to prevent vulnerabilities.

Learn about secure coding with C# by exploring the OWASP top ten web application security risks, including broken access control, cryptographic failures, injection, and security misconfiguration.

Explore a live OWASP juice shop demo, revealing broken access control, insecure direct object references, broken authentication, SQL injection, insecure configuration, and typosquatting to learn secure coding practices in C#.

Establish a secure software development life cycle within a robust product development model, integrating compliance, risk assessment, architecture review, secure coding, static and dynamic analysis, and timely vulnerability checks.

Analyze code with manual reviews or automated tools to identify bugs and security vulnerabilities. Generate reports from static analysis tools like Sonarqube, and apply corrective actions, including AI-assisted code corrections.

Apply fixes to identified vulnerabilities in code or design, then rerun the analysis to verify improvements and reinforce secure coding practices using Sonar Cube and sonar lint guidance.

Run regular vulnerability checkups with tools like OWASP dependency check and OpenVAS, stay current with advisories and patches for dependencies and libraries, and train staff on security best practices.

Apply a robust secure development life cycle to integrate security practices across requirement gathering, design, implementation, testing, maintenance, and include code analysis, corrections, and vulnerability checkups for web application security.