I am a Computer Science student going into Network Security. I know Java, C, enough PHP to secure existing code, Unix and batch scripting. I use Unix and batch scripts a lot in my job to automate tasks. I also write some of my own tools like network scanners, and my current project and intruder detection system. I am an Ethical Hacker so I also work on password crackers and other tools to test security where I work. Best way to know you are secure is to try to hack your system. (Note: I will not post code that could be used in a malicious way because it would be unethical and violates forum rules however, I will be happy to provide solutions to vulnerabilities that I notice.) While my main focus is Network Security, I am a also Certified Usability Analyst. So feel free to shoot me questions on usability as well.