The second step is to implement security measures to address the issues and gaps that you found in the assessment. You need to follow secure development lifecycle (SDLC) principles, which include planning, designing, coding, testing, deploying, and maintaining your app with security in mind. Additionally, use secure frameworks, libraries, and APIs that are updated and verified by trusted sources. For example, strong encryption should be used for data in transit and at rest, while secure authentication and authorization mechanisms such as biometric or token-based methods should be used instead of hardcoding credentials or using weak passwords. Furthermore, secure communication protocols such as HTTPS or TLS should be used and certificates and signatures should be validated. Moreover, secure coding practices like input validation or output encoding should be used to avoid common vulnerabilities like SQL injection or cross-site scripting. Additionally, secure testing tools and methods like static analysis or fuzzing should be used to fix any bugs before releasing your app. Finally, use secure deployment and maintenance processes like code signing or patch management to monitor your app's performance and security regularly.