In 1997's Bernstein v United States, another US appeals court found that code was protected expression. Bernstein was a turning point in the history of computers and the law: it concerned itself with a UC Berkeley mathematician named Daniel Bernstein who challenged the American prohibition on producing cryptographic tools that could scramble messages with such efficiency that the police could not unscramble them. The US National Security Agency (NSA) called such programs "munitions" and severely restricted their use and publication. Bernstein published his encryption programs on the internet, and successfully defended his right to do so by citing the First Amendment. When the appellate court agreed, the NSA's ability to control civilian use of strong cryptography was destroyed. Ever since, our computers have had the power to keep secrets that none may extract except with our permission – that's why the NSA and GCHQ's secret anti-security initiatives, Bullrun and Edgehill, targetted vulnerabilities in operating systems, programs, and hardware. They couldn't defeat the maths (they also tried to subvert the maths, getting the US National Institute for Standards in Technology to adopt a weak algorithm for producing random numbers).
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