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Saturday, 14 May 2011
Inventions sweep the world with increasing frequency, as is only to be expected with an exponentially growing pool of inventors and an exponentially growing foundation of science upon which they can base their inventions.
One of the big sweeps is unquestionably the mobile phone. Anyone over the age of thirty can remember a world without it, but for all of us that world seems impossibly distant and unconnected, both with itself, and with us.
The frequency-shift communication that makes mobile phones possible was famously invented by Hedy Lamarr. Indeed, it is an interesting aspect of fame that her invention will probably turn out to be the one by which future ages will remember her. Anyone in the 1940s would have been flabbergasted if they could have known that back then. To them it would be as if a time traveler from 2500 were to tell us that Einstein will be principally famous for his haircut. (Hedy Lamarr was called "The Most Beautiful Woman in Film" by her biographer Ruth Barton; form your own judgement from the picture.)
Now all over the world dictators are beginning to tremble as ordinary people take an instrument they use for chatting, and with it scythe off trigger-happy riot squads at the knees with the deadlier weapon of documentary exposure.
But the weak point in the system is the service providers and their base stations. The base stations are too vulnerable to being turned off by those dictators, and the companies succumb to injunctions to surrender up call records and the like.
However, now that we have open phones that we can program ourselves, those service providers and base stations should become redundant. That is because every mobile phone can be a base station for others nearby. If I make a call it would hop from phone to phone across the city, then maybe dive down a wi-fi connection a few miles away to emerge at another on a different continent and then to go hopping on to my interlocutor. The nice thing about this scheme is that the bandwidth of such a system is proportional to the number of phones in a locality. (To be pedantic, the bandwidth is proportional to the square-root of the density of phones in the locality.) Just where you need a lot of bandwidth, there are a lot of phones.
There is a problem. To preserve your battery, your optimal strategy is to be a parasite - to use the open network, but selfishly not to forward the links needed by others. But this is easily remedied: the software in the other's phones simply tests your phone to see if it is programmed like that and - if it is - other phones don't give you your calls. That way everyone is rewarded if they add their bit to the commonwealth.
The system could be fully protected using hard encryption, with friends Diffie–Hellman-swapping their public keys just as for encrypted e-mail. No one in the middle could listen in.
And then what would we have? We'd have a completely free universal phone system that no company or government could shut down, and in which anonymity and untraceability would be preserved. All you would have to buy would be the phone and electricity needed to charge its battery.