Walter started hacking in the late 1980s, after he got his first UNIX account at his university. It was a time of pioneering. No computer crime laws existed but he was in some scary situations. Luckily, Walter was able to become an ethical hacker and make it his profession. He is also a known lockpicker and wrote a book on the subject. When Walter is not hacking, he likes to read, sail, and drive in rally cars in Finland.