## cryptography

A team of computer scientists has found a weakness in the world's most popular anonymity service.

Marcus du Sautoy talks about football, cryptography, and numbers.

*The universal machine* is a musical about Alan Turing, the mathematician and WWII code breaker who was convicted of homosexuality in the 1950s, chemically castrated as a result, and died young in mysterious circumstances. How do you turn such a story, and the maths in it, into a musical? We talked to writer and director David Byrne, Richard Delaney, who plays Turing, and Assistant Director Natalie York.

**Stefan Kopieczek**explores his story.

Fame, glory, and more importantly prizes are on offer in the National Cipher Challenge.

**Riemann Hypothesis**is probably the hardest unsolved problem in all of mathematics, and one of the most important. It has to do with prime numbers - the building blocks of arithmetic. Nick Mee, together with Sir Arthur C. Clarke, tells us about the patterns hiding inside numbers.