Keeping secrets is one of the earliest inventions of civilisation, and has become the science of cryptography. The World War II Enigma machine was just lots of scrambling, done in ways that could be understood in principle by a school child though it took daring and powerful computing to crack it. This lecture introduces the key ideas behind conventional cryptography, and explains why it is not good enough for modern applications such as international commerce on the Internet.
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London has some major disadvantages that would make any transport policy difficult. However, even given the constraints, the current policy mix is so far away from ideal that it could be costing each household about Â£1,000 more than it should if transport were to be organised rationally.Â The lecture will give some suggestions about what could be done.
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