An Application or Device is Only as Secure as it was Tested Against
It still amazing in this day and age how many Security Professionals, Developers and Architect still believe in the Silver Bullet and automatically accept an Application is Secure becomes someone says it is. The quick and easy way out does not work when it comes to Security.
I never believe anything is 100% Secure. There is nothing in this world that is perfect. Applications can only be deemed safe if proper Security testing was conducted and then again it can only be deemed safe for what it was tested against. You can never consider yourself deem safe for the unknown.
I thought the Myth Busters from the Discovery channel did an excellent of pointing out how anything including bio-metrics security mechanisms are also fallible.
This is an excellent video!! http://www.youtube.com/watch?v=oXyFmieZjiE