How can you make a good strong software?

Answer 1

The key to making secure software is to adopt a clean and consistent coding style (follow standard coding rules and comment your code), and keep an eye out for any vulnerabilities in your program. Test your program by executing EVERY path of code. This means not only testing the main code, but also the numerous error paths and check to see if the results are what you want. Always check for major vulnerabilities in your program, including buffer overflows, code injection, format string attacks, privilege escalation, dangling pointers, and others.