Revelations of the extent of government surveillance have thrown a spotlight on the security – or lack thereof – of our digital communications. Even today’s encrypted data is vulnerable to technological progress. What privacy is ultimately possible? In the 27 March issue of Nature, researchers Artur Ekert and Renato Renner review what physics tells us about keeping our secrets secret.
In the history of secret communication, the most brilliant efforts of code-makers have been matched time and again by the ingenuity of code-breakers. Sometimes we can even see it coming. We already know that one of today’s most widely used encryption systems, RSA, will become insecure once a quantum computer is built.
But that story need not go on forever. “Recent developments in quantum cryptography show that privacy is possible under stunningly weak assumptions about the freedom of action we have and the trustworthiness of the devices we use,” says Ekert, Professor of Quantum Physics at the University of Oxford, UK, and Director of the Centre for Quantum Technologies at the National University of Singapore. He is also the Lee Kong Chian Centennial Professor at the National University of Singapore.
Read more at: Phys.org