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If the BBC story on the latest sally by a government against encryption, this time by the Australians, accurately reflects that government's position, the Australian Prime Minister could definitely benefit from the example of King Canute. The BBC quotes Mr. Turnbull as saying "The laws of mathematics are very commendable, but the only law that applies in Australia is the law of Australia."
OK then. Meanwhile, back in reality, powerful ciphering algorithms and the computers to implement these all exist. Whatever we may feel about living in a world where the power of government to keep us secure falls considerably short of omnipotence, we do live in that world. Politicians who gobble with outrage when forced to accept limits on their power to intercept and read all communications only make themselves look ridiculous.