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Tech Tent: The crypto-currency craze

On the podcast this week, Rory finds out why investors are backing start-ups with virtual currencies.

21 July 2017
Rory Cellan-Jones Technology correspondent

Defending Tor - gateway to the dark web

Roger Dingledine co-created Tor, the software that criminals use to anonymously access the internet.

5 August 2017
Dave Lee North America technology reporter

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