Creating a secure software development blueprint is essential for ensuring the safety and integrity of software applications. Here are four principles that should be considered when creating a new blueprint for secure software development:

1. Secure coding practices: Secure coding practices are essential for developing software that is secure by design. It includes coding practices that prevent common vulnerabilities such as SQL injection, cross-site scripting, and buffer overflow attacks. Developers should be trained in secure coding practices and use tools such as code analyzers to identify potential security issues.
2. Threat modeling: Threat modeling identifies potential software application threats and develops a plan to mitigate them. It involves analyzing the application's architecture, identifying potential attack vectors, and designing countermeasures to prevent or mitigate these attacks.
3. Continuous security testing: Continuous security testing involves the ongoing testing of software applications throughout the development lifecycle. It includes testing for vulnerabilities such as code injection, denial-of-service attacks, and data breaches. Security testing should be automated whenever possible to ensure that vulnerabilities are detected and addressed quickly.
4. Secure deployment: Secure deployment ensures that software applications are deployed in a secure environment. It includes deploying applications to secure servers, using secure communication protocols such as SSL/TLS, and implementing access controls to ensure that only authorized users can access the application.

These principles, developers can create a new blueprint for secure software development that ensures the safety and integrity of software applications throughout the development lifecycle.