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Conventional Cryptography

Keeping secrets is one of the earliest inventions of civilisation...

Computers need not just automate what is already being done...

Every so often there is a panic when computers succumb...

Previous lectures looked at the inside of gadgets, but this...

Symmetric things are often more attractive. Symmetry is also a...

This lecture looks at the way images can be distorted...

When computers are plugged in, they can do amazing things...

Mathematical concepts have often been used to create new structural forms in fiction, as in the works of Raymond Queneau and Jorge Luis Borges.

How can we distinguish between 'easy problems' and 'hard problems'...