The term "phone phreaking" predates "malicious hacking" and the myriad of Internet-age terms that have come to represent the analogue of phone phreaking in the modern age. By their very nature, all security systems pose a challenge to those who perceive themselves as being on the outside of the barrier.
What I think is the biggest sea change in telecommunications security is in the area of motivation. Phone phreakers were, by and large, interested in the security of telecommunications systems per se; it was viewed by the phreakers as a mostly intellectual pursuit.
Today, however, we see a bifurcation of objectives: while some continue their pursuit rightly or wrongly for purely intellectual challenge, the commercial benefits in the areas of unsolicited commercial calling (spam messaging) and in industrial espionage are perceived to be so great that very well-financed and sophisticated attacks are appearing at an alarming rate on the Internet. This is not just a risk for VoIP, but for the general computing milieu of which VoIP is merely one part.
What challenges do you face in the marketplace? What do you see as your advantages?
While Skype is a leader in the area of peer-to-peer communications and in converged messaging, there is always the possibility of becoming obsolete due to competition. The challenge we face is partly organisational making sure we use our resources effectively and remain lean and partly technological, ensuring that our developments are relevant, innovative and easy-to-use.
I suppose that the challenges we face in the marketplace are the same as any other new company: gaining customer acceptance and focusing on delighting our users every single day.