So way back in the day, I used to watch Phil of the Future, and he mentioned a device that replaced the thing that replaced the thing that killed The Internet.
So that got me thinking, of what kind of device would be capable of killing (superseding) The Internet. At last I've thought of a device that could conceivably do just that, except I run into problems that the internet has already solved to some extent, but the solutions don't apply to my situation... demonstrating would probably be easier...
So, here's the scenario: The schematics of a device that can send and receive visible light on an infinite number of subspace channels are now publicly known. These devices are portable, self powering (actually through an internal solar panel portal combination), allow for communication faster than light, and could be made in a variety of sizes, and maybe even integrated into laptops.
The sending and receiving sides can be programmed to different channels, and like I said, there is no limit to the channels, so for those familiar with cryptography, it would be a simple matter for Alice and Bob to randomly generate keypairs and listen on a channel corresponding to their public key and talk with each other. If they had some other means to communicate the keys...
The problem is that as soon as someone knows the channel you're listening on, they could flood it with light to drown out any other signal, or fill it with random light to make any other signal unintelligible.
Anyone can send and receive on any channel, but channels can become "noisy" somewhat like WiFi, but I can't really see a good way to make an internet-like structure on top of it.
So here are my questions. How can Alice and Bob share their keys initially? Channel 1 would probably be more than overwhelmed with others trying to do just that. How can they prevent the equivalent of DOS attacks (the light problem above)?
Also as an aside in the comments, can anyone see any other inherent problems with this? I'll add them as they come up if I think they would cause problems.