Validating user input data before it is processed by the application is a fundamental security control in software design. This process, known as input validation, ensures that only properly formed data is entering the workflow of the application, thereby preventing many types of attacks, including type mismatches as mentioned in the question. By validating input data, the application can reject any requests that contain unexpected or malicious data, reducing the risk of security vulnerabilities and ensuring the integrity of the system.
References:
* Secure SDLC practices emphasize the importance of integrating security activities, such as creating security and functional requirements, code reviews, security testing, architectural analysis, and risk assessment, into the existing development workflow1.
* A Secure Software Development Life Cycle (SSDLC) ensures that security is considered at every phase of the development process, from planning and design to coding, testing, deploying, and maintaining the software2.

The three primary goals of the secure software development process, often referred to as the CIA triad, are confidentiality, integrity, and availability. These principles form the cornerstone of security considerations in the software development life cycle (SDLC).
* Confidentiality ensures that sensitive information is accessed only by authorized individuals and systems. This involves implementing access controls and encryption to protect data from unauthorized access.
* Integrity refers to maintaining the accuracy and consistency of data across its lifecycle. This means that the data is not altered or tampered with by unauthorized entities. Techniques like checksums and digital signatures help ensure data integrity.
* Availability ensures that information and resources are accessible to authorized users when needed.
This involves creating resilient systems that can withstand attacks and recover quickly from any disruptions.
By integrating these security goals into each phase of the SDLC, from planning and design to development, testing, and maintenance, organizations can create more secure software systems that are resilient to cyber threats.
References: The information provided here is verified as per the Secure Software Design documents and best practices in the field, as outlined by sources such as Snyk1, GeeksforGeeks2, and SAFECode3.

The privacy impact rating for an application that stores personally identifiable information (PII), monitors users with ongoing transfers of anonymous data, and changes settings without notifying the user would be P1 high privacy risk. Storing PII already poses a significant risk due to the potential for data breaches and misuse. Monitoring users and transferring data, even if anonymous, increases the risk as it involves ongoing data collection. Changing settings without user notification is a serious privacy concern because it can lead to unauthorized data processing or sharing, further elevating the risk level.
References:
* Practical Data Security and Privacy for GDPR and CCPA - ISACA1.
* Privacy risk assessment and privacy-preserving data monitoring2.
* How To Effectively Monitor Your Privacy Program: A New Series3.