Communications and privacy will always be a concern, any protocol a computer can generate can be broken, the question is how long, and how important.
If your ego about your importance in the world is justified by others, then expect them to be listening. You can only slow them down.
For the rest of us, who are meaningless, no one will take the time to break through tissue paper to listen in on us. And we are safe enough.
If you seek real security, don’t use a computer to encrypt your message, find a better way.
I’m waiting for the first mass exploitation virus for the iPhone to arrive. With the iPhone ecosystem reaching critical mass, there can’t be much left in the way of roadblocks to prevent this. There has already been exploits that targeted ‘jail broken’ iPhones, more likely to have been created by Apple, or a fan of Apple DRM. Therefore the likelihood that a more potent virus will emerge is very high. The likely suspect, is one that exploits the ‘closed’ nature of the device, where the victim iPhone will show no indication of an infection.
Not that my chosen device is not subject to the same attacks, the Nokia N900 is also a target, but its just not as big a target as the iPhone. More or less the same argument that has been used to justify the lack of viruses on the Mac platform. I have a Mac also, and I feel safe, but not because it’s immune to viruses, it HAS been less targeted, and it has been ACTIVELY defended.