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  • Writer's pictureAppsec360 Team

Core Tenets of Secure SDLC

Core Tenets of Secure SDLC

In today's digital world, secure software development is not just an option—it's a necessity. With cyber threats constantly evolving, ensuring that the software you build can withstand attacks and protect your users' data is essential. To achieve this, one must embrace the core tenets of security software development. This blog post will outline these principles and provide a comprehensive checklist to help you create robust and secure applications.

Core Tenets of Secure Software Development

Secure by Design

Probably the most undervalued of all activities of a secure SDLC, developing secure software starts with a well-thought-out design. A secure design should incorporate security measures from the beginning of the development process, ensuring that the architecture, frameworks, and technologies are built to withstand potential threats.


  • Define security requirements early in the development process.

  • Perform a thorough threat modeling to identify potential risks.

  • Choose secure frameworks and libraries.

  • Implement secure coding practices and standards.

  • Ensure proper data protection through encryption and access controls.

Least Privilege

Principle The least privilege principle dictates that software components should only have the minimum permissions necessary to perform their tasks. Well-designed software will consider the least privileged approach during each stage of the software's evolution. This limits the potential damage that can be done by an attacker who gains unauthorized access to a system.


  • Limit user permissions and roles.

  • Restrict access to sensitive data and resources.

  • Use secure APIs with proper authentication and authorization controls.

  • Implement sandboxing and isolation techniques to limit potential damage.

Input Validation and Sanitization

Validating and sanitizing user input is crucial to preventing security vulnerabilities such as SQL injection, cross-site scripting (XSS), and other injection attacks. Again, one of the prolifically undervalued aspects of secure development. This process involves checking the input against predefined rules and removing or altering malicious data.


  • Validate all user inputs against expected data types and formats.

  • Sanitize user input to remove or escape any potentially harmful characters.

  • Use secure input validation libraries and frameworks.

  • Implement server-side validation in addition to client-side validation.

Secure Data Storage and Transmission

Protecting data at rest and in transit is essential to ensure the confidentiality and integrity of your application. Understanding what needs encryption and what does not and how to bridge the two is a tricky decision and needs to be a core consideration during software development. Generally speaking, this involves encryption, secure protocols, and proper access controls.


  • Use robust encryption algorithms to protect sensitive data.

  • Implement secure protocols such as HTTPS, SSL/TLS, and secure file transfer protocols (e.g., SFTP) for data transmission.

  • Regularly review and update encryption keys and certificates.

  • Store passwords and other sensitive data using secure hashing algorithms and salt values.

Security Testing and Monitoring

Regular application testing and monitoring for vulnerabilities and potential threats can help you identify and address security issues before they can be exploited. The software development process overwhelmingly focuses on testing via tools (and humans, too) to find and fix issues.


  • Perform regular security audits and code reviews.

  • Use automated security testing tools to identify vulnerabilities.

  • Monitor application logs and traffic for signs of suspicious activity.

  • Implement intrusion detection and prevention systems.

  • Conduct regular vulnerability assessments and penetration tests.

Incident Response and Recovery

A well-defined incident response plan can minimize the impact of a security breach and help you recover quickly. This sounds like something that does not fit into a development process, but having Application Security Incident Response Plan (ASIRP) is extremely useful when something goes wrong.


  • Develop and maintain a detailed incident response plan.

  • Regularly update and test your backup and recovery procedures.

  • Train your team on how to recognize and report security incidents.

  • Perform post-incident analysis to identify areas for improvement.


By incorporating these core tenets of secure software development and following the pointers, you can ensure your software is more resilient to cyber threats. Remember that security is an ongoing process, and staying informed about the latest threats and best practices is crucial to continually improving your application's security posture.

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