On Mon, Jun 18, 2012 at 8:56 PM, Eric Walker <[email protected]> wrote:
Perhaps they're using quantum cryptography with an enormously large key > strength. With sufficiently advanced encryption, we could mistake the > signal for white noise. > Just to elaborate -- you would need to do more than simply encrypt the contents of the signal to achieve some kind of cloaking, since the way we transmit radio these days lends itself to detection in various ways, even if the contents cannot be decrypted. You could look for sharp peaks of intensity across the radio spectrum, for example, and figure out that there are other people using radios. In order to have cloaking, you would need to get rid of all obvious trace of a signal, perhaps along these lines: - Take a large sample of the background noise across the full range of the human-safe EMF spectrum detected in the vicinity of the antenna. - Encrypt your message with very strong encryption. - Using the background as the carrier signal, introduce small bits of your message here and there, amplifying and attenuating the background just a tiny bit across the full range of frequencies. - Use incredibly massive redundancy to ensure that the encrypted signal survives errors in transmission so that it can be successfully decrypted. Eric
