[转载]GCHQ Patent：Split-key cryptographic system

信息来源：邪恶八进制信息安全团队（www.eviloctal.com）

For the next three years, GCHQ's brightest minds struggled to find a one-way function that satisfied Ellis's requirements, but nothing emerged. Then, in September 1973, a new mathematician joined the team. Clifford Cocks had recently graduated from Cambridge University, where he had specialised in number theory, one of the purest forms of mathematics. When he joined GCHQ he knew very little about encryption and the shadowy world of military and diplomatic communication, so he was assigned a mentor, Nick Patterson, who guided him through his first few weeks at GCHQ.  

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Link http://cryptome.org/gchq-6731755.htm
hq-6731755.htm