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Is your mobile phone ‘leaking’ data even though the encryption tools it uses are mathematically perfect? Will quantum computing spell the end of online payments? And could cryptocurrencies, such as Bitcoin, be the banking revolution which the developing world needs? Bridget Kendall talks to cryptographer Maire O’Neill, philosopher Luciano Floridi and financial journalist Paul Vigna. (Photo: Digital binary code background. Credit: Shan Pillay)